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    Reactions & Formulas
                Introductory Chemistry
                      Canadian Academy
                             MrT


            draft presentation – to be updated
The magnesium is combusting.


            The magnesium is combining
                   with oxygen.



There is a physical
 change but not a
chemical change.



                                              2
Reactions & Formulas
Assessment Statements
  • Name simple ionic and covalent compounds from their formula.
  • Write formulas for simple ionic and covalent compounds based on
    their name.
  • Write word equations for reactions.
  • Identify reactants and products in reactions.
  • Apply state symbols to equations.
  • Balance simple formula equations.
  • Identify characteristics of reactions:
      • ∆ colour
      • ∆ temperature (exothermic or endothermic)
      • precipitate formation
      • gas production
      • ∆ pH
  • Use conditions for reactions appropriately above the arrow in the
    equation (heat, catalyst etc).
  • Recognise six types of reaction: synthesis, decomposition, single
    replacement, double replacement, combustion and neutralisation.
1    2                                                     13 14 15 16 17 18
+1   +2                                                           -3 -2 -1

                                                                  non-metals




          Periodic table from: http://www.elementsdatabase.com/
+1 +2                                                                     -3 -2 -1

                                                                       non-metals




        http://commons.wikimedia.org/wiki/Periodic_Table_of_Elements
How do we know a reaction has taken place?
  •   ∆ colour (∆ = ‘change in’)
  •   ∆ temperature (exothermic or endothermic)
  •   ∆ pH
  •   precipitate formation
  •   gas production




 Which of these signs of a chemical reaction have
 we come across in our reactions so far?
Naming Ions
Remember: metals bonding with
non-metals form ionic bonds.

Some ions are polyatomic. This
means they are made of groups
of atoms which stay together in
reactions – such as carbonates.

What do the elemental anions
have in common in their name?


What do the polyatomic anions
have in common in their name
(except hydroxide)?


What is the difference between
the iron (II) and iron (III) ions?
Naming Ionic Compounds
Rules:
• balance the charges
• keep polyatomic ions together
Examples:
HCl      hydrogen chloride
NaOH     sodium hydroxide
ZnCl2    zinc chloride
Fe2O3    iron oxide
NaOH     sodium hydroxide
Pb(NO3)2 lead nitrate
Naming Covalent Molecules
 Remember:   You can only correctly call it a molecule if it is covalently-bonded.
             Covalent bonds form between non-metal atoms.

                    Name the compound this way:
                       • You don’t need mono- if the first atom is single
                       • Use the prefixes for all other atoms

                    Examples:
                    CO        carbon monoxide
                    CO2       carbon dioxide
                    N2O3      dinitrogen trioxide



      CF4             N2O4                    N2H4                    H2O
Conventions in Writing Reactions
            reactants                                                  products
                                conditions for reaction to occur
                                        (e.g. heat, catalysts)
  symbol equation
         Mg
              (s)
                     +     O2
                               (g)
                                            heat
                                                                    MgO
                                                                           (s)
      magnesium       +     oxygen                               magnesium oxide
                                                  “gives”
  word equation


  State symbols need to be included:
          (s)         solid – this included precipitates
          (g)         gas
          (l)         liquid
          (aq)        aqueous solution: solutes dissolved in water

                    state symbols should be subscripted
Wait!
        The reactants and products are not balanced



      Mg
           (s)
                 +   O2
                        (g)
                              heat
                                            MgO
                                                   (s)
   magnesium     +   oxygen              magnesium oxide
Balancing Equations
 The Law of Conservation of Mass states that matter is neither created nor destroyed.
 There MUST be the same number of atoms on each side of the equation.

           Mg
                (s)
                           + O2 (g)                   heat
                                                                             MgO
                                                                                   (s)
        magnesium          +        oxygen                               magnesium oxide

                                        Reactants                       Products
                 Mg                          1                              1
                 O                           2                              1


                      Simple steps for balancing equations:
                      1.       List & count the elements and groups on each
                               side of the equation. Don’t split polyatomic ions.
                      2.       Select the compound with the greatest number of
                               atoms (not counting H and O).
                      3.       Balance the atoms in this compound on both sides
                               of the equation.
                      4.       Don’t change any compounds.
                      5.       Balance any groups, such as polyatomic ions.
                      6.       Finish up with H and O.
Balancing Equations
 The Law of Conservation of Mass states that matter is neither created nor destroyed.
 There MUST be the same number of atoms on each side of the equation.

           Mg
                (s)
                           + O2 (g)                   heat
                                                                         2MgO      (s)
        magnesium          +        oxygen                               magnesium oxide

                                        Reactants                       Products
                 Mg                          1                             1 2
                 O                           2                             1 2


                      Simple steps for balancing equations:
                      1.       List & count the elements and groups on each
                               side of the equation. Don’t split polyatomic ions.
                      2.       Select the compound with the greatest number of
                               atoms (not counting H and O).
                      3.       Balance the atoms in this compound on both sides
                               of the equation.
                      4.       Don’t change any compounds.
                      5.       Balance any groups, such as polyatomic ions.
                      6.       Finish up with H and O.
Balancing Equations
 The Law of Conservation of Mass states that matter is neither created nor destroyed.
 There MUST be the same number of atoms on each side of the equation.


        2Mg     (s)
                           + O2 (g)                   heat
                                                                         2MgO      (s)
        magnesium          +        oxygen                               magnesium oxide

                                        Reactants                       Products
                 Mg                         1 2                            1 2
                O                 2                        1 2
    Two molecules of Mg are needed to react with one molecule of O2, giving 2 MgO.

                      Simple steps for balancing equations:
                      1.       List & count the elements and groups on each
                               side of the equation. Don’t split polyatomic ions.
                      2.       Select the compound with the greatest number of
                               atoms (not counting H and O).
                      3.       Balance the atoms in this compound on both sides
                               of the equation.
                      4.       Don’t change any compounds.
                      5.       Balance any groups, such as polyatomic ions.
                      6.       Finish up with H and O.
Types of Reactions

                 A+B        AB         AB             A+B




                         replacement




                                       replacement
                                          double
                            single
     AB + C     CB + A                               AB + CD    AD + BC



                                                        heat
 H[A] + [B]OH     [B][A] + H2O         CxHx + O2               CO2 + H2O
Synthesis Reactions
These can be simplified as A + B  AB
Where two or more reactants combine to make a single product.


                    +

        CO2         + H2O                             H2CO3
              (g)               (l)                               (aq)
 carbon dioxide     +   water                           carbonic acid


                         Reactants                Products               balanced?
            C
           O
           H
Synthesis Reactions
These can be simplified as A + B  AB
Where two or more reactants combine to make a single product.


                    +

        CO2         + H2O                             H2CO3
              (g)                (l)                                (aq)
 carbon dioxide     +   water                             carbonic acid


                         Reactants                Products                 balanced?
            C                1                        1
           O                 3                        3
           H                 2                        2
Types of Reactions

                 A+B        AB         AB             A+B




                         replacement




                                       replacement
                                          double
                            single
     AB + C     CB + A                               AB + CD    AD + BC



                                                        heat
 H[A] + [B]OH     [B][A] + H2O         CxHx + O2               CO2 + H2O
Decomposition Reactions
These can be simplified as AB  A + B
Where a single reactant breaks down into component elements or compounds.



                                                                      +
                                         MnO2
               H2O2                                       H2O         + O2
                      (l)                                       (l)              (g)
         hydrogen peroxide                                 water      +     oxygen


 MnO2 acts as a catalyst in this reaction.
 It allows the reaction to take place more quickly but is not used up.
 We put it above the arrow. It can be recovered and reused in another reaction.




                                          MnO2
Decomposition Reactions
These can be simplified as AB  A + B
Where a single reactant breaks down into component elements or compounds.



                                                                      +
                                         MnO2
               H2O2                                       H2O         + O2
                      (l)                                       (l)             (g)
         hydrogen peroxide                                 water      +    oxygen

 MnO2 acts as a catalyst in this reaction.
 It allows the reaction to take place more quickly but is not used up.
 We put it above the arrow. It can be recovered and reused in another reaction.




                           MnO2
Decomposition Reactions
These can be simplified as AB  A + B
Where a single reactant breaks down into component elements or compounds.



                                                                      +
                                          MnO2
               H2O2                                       H2O         + O2
                       (l)                                      (l)             (g)
          hydrogen peroxide                                water      +    oxygen

 MnO2 acts as a catalyst in this reaction.
 It allows the reaction to take place more quickly but is not used up.
 We put it above the arrow. It can be recovered and reused in another reaction.

 Enzymes are catalysts found in living organisms.
 They are proteins with an active site.

                                           MnO2
Decomposition Reactions
These can be simplified as AB  A + B
Where a single reactant breaks down into component elements or compounds.



                                                                  +
                                      MnO2
               H2O2                                   H2O         + O2
                      (l)                                   (l)            (g)
         hydrogen peroxide                             water      +   oxygen


                        Reactants                Products             balanced?
           O
           H
Decomposition Reactions
These can be simplified as AB  A + B
Where a single reactant breaks down into component elements or compounds.



                                                                    +
                                      MnO2
               H2O2                                      H2O        + O2
                      (l)                                     (l)            (g)
         hydrogen peroxide                               water      +   oxygen


                        Reactants                Products               balanced?
           O                 2                       3
           H                 2                       2
Decomposition Reactions
These can be simplified as AB  A + B
Where a single reactant breaks down into component elements or compounds.



                                                                  +
                                      MnO2
               H2O2
                      (l)
                                                   2H2O +   (l)
                                                                       O2
                                                                           (g)
         hydrogen peroxide                             water      +   oxygen


                        Reactants                Products             balanced?
           O                 2                     3 4
           H                 2                     2 4
Decomposition Reactions
These can be simplified as AB  A + B
Where a single reactant breaks down into component elements or compounds.



                                                                  +

           2H2O2                      MnO2
                                                   2H2O +              O2
                      (l)                                   (l)            (g)
         hydrogen peroxide                             water      +   oxygen


                        Reactants                Products             balanced?
           O                 2 4                   3 4
           H                 2 4                   2 4
Decomposition Reactions
These can be simplified as AB  A + B
Where a single reactant breaks down into component elements or compounds.




                                     Heat




                                     Heat
     CuSO4.5H2O                                 CuSO4 +              5H2O     (g)
                           (s)                               (s)

 copper (II) sulphate pentahydrate          copper (II) sulphate +    water
Decomposition Reactions
These can be simplified as AB  A + B
Where a single reactant breaks down into component elements or compounds.




                                     Heat
                                                                   +

                                     Heat
     CuSO4.5H2O                                 CuSO4 +                5H2O     (g)
                           (s)                               (s)

 copper (II) sulphate pentahydrate          copper (II) sulphate +      water
28
Danger: dihydrogen monoxide!
  Lethal if inhaled.
  Found in disaster zones.
  Reduces the effectiveness of brakes.
  Found in tumour cells, viruses and deadly bacteria.
  Contributes to electrocutions.
  Used by terrorists and pirates.




   Find out more about this lethal substance:   http://www.dhmo.org/facts.html
Ionic                                        Covalent




• Don’t use mono-, di- etc in prefixes.   • Endings usually –ide.
• Cation, then anion                      • Don’t need mono- prefix for first
  e.g. lithium bromide.                     atom if it is single (e.g. CH4)
• Don’t break up polyatomic ions.         • Name in order of the periodic
                                            table, but H is before O
Remember that in ionic compounds,
the sum of the charges must be zero.
Therefore sodium sulphide is Na2S, not
NaS.

                                                                           30
Types of Reactions

                 A+B        AB         AB             A+B




                         replacement




                                       replacement
                                          double
                            single
     AB + C     CB + A                               AB + CD    AD + BC



                                                        heat
 H[A] + [B]OH     [B][A] + H2O         CxHx + O2               CO2 + H2O
Combustion Reactions
This is the combustion (burning) of a hydrocarbon (contains C and H), in oxygen.
Complete combustion results in the products water and carbon dioxide.


        CxHx
             ()
                    +    O2
                             (g)
                                          heat
                                                             CO2 + H2O
                                                                    (g)             (g)
    hydrocarbon     +   oxygen                         carbon dioxide +     water


  e.g

        CH4
              (g)
                    + O2 (g)              heat
                                                             CO2 + H2O
                                                                    (g)             (g)
        methane     +   oxygen                         carbon dioxide +     water

                                   Reactants                 Products
                    C                 1                         1
                    O                 2                         3
                    H                 4                         2
Combustion Reactions
This is the combustion (burning) of a hydrocarbon (contains C and H), in oxygen.
Complete combustion results in the products water and carbon dioxide.


        CxHx
             ()
                    +    O2
                             (g)
                                          heat
                                                             CO2 + H2O
                                                                    (g)             (g)
    hydrocarbon     +   oxygen                         carbon dioxide +     water


  e.g

        CH4         + O2 (g)              heat
                                                             CO2 +2H2O
              (g)                                                   (g)             (g)
        methane     +   oxygen                         carbon dioxide +     water

                                   Reactants                 Products
                    C                 1                         1
                    O                 2                        3 4
                    H                 4                        2 4
Combustion Reactions
This is the combustion (burning) of a hydrocarbon (contains C and H), in oxygen.
Complete combustion results in the products water and carbon dioxide.


        CxHx
             ()
                    +    O2
                             (g)
                                           heat
                                                             CO2 + H2O
                                                                    (g)             (g)
    hydrocarbon     +   oxygen                         carbon dioxide +     water


  e.g

        CH4
              (g)
                    + 2O2 (g)              heat
                                                             CO2 +2H2O
                                                                    (g)             (g)
        methane     +   oxygen                         carbon dioxide +     water

                                   Reactants                 Products
                    C                 1                         1
                    O                2 4                       3 4
                    H                 4                        2 4
Combustion Reactions
A chemical reaction is taking place at the gas tap!


    C3H8
            (g)
                +     O2
                           (g)
                                       heat
                                                               CO2 + H2O
                                                                      (g)              (g)
    propane       +   oxygen                             carbon dioxide +      water

                                                      Which product of one of the reactions
                                                      we’ve carried out already could be used
                                                      to test if the condensation really is water?


                                                      Is propane a covalent or ionic compound?


                                                      What’s an alternative name for
                                                      propane, based on the naming
                                                      conventions we have just learned?
Combustion Reactions
A chemical reaction is taking place at the gas tap!


    C3H8
            (g)
                +         O2
                               (g)
                                        heat
                                                           CO2 + H2O
                                                                   (g)           (g)
    propane       +       oxygen                      carbon dioxide +   water




     Is it balanced?



                                     Reactants               Products
                      C
                      O
                      H
Combustion Reactions
A chemical reaction is taking place at the gas tap!


    C3H8
            (g)
                +         O2
                               (g)
                                        heat
                                                           CO2 + H2O
                                                                   (g)           (g)
    propane       +       oxygen                      carbon dioxide +   water




     Is it balanced?



                                     Reactants               Products
                      C                 3                        1
                      O                 2                        3
                      H                 8                        2
Combustion Reactions
A chemical reaction is taking place at the gas tap!


    C3H8
            (g)
                +         O2
                               (g)
                                        heat
                                                        3CO2       (g)
                                                                      + H2O
                                                                                 (g)
    propane       +       oxygen                      carbon dioxide +   water




     Is it balanced?



                                     Reactants               Products
                      C                 3                       1 3
                      O                 2                       3 6
                      H                 8                        2
Combustion Reactions
A chemical reaction is taking place at the gas tap!


    C3H8
            (g)
                +         O2
                               (g)
                                        heat
                                                        3CO2 +4H2O (g)           (g)
    propane       +       oxygen                      carbon dioxide +   water




     Is it balanced?



                                     Reactants               Products
                      C                 3                       1 3
                      O                 2                     3 6 10
                      H                 8                       2 8
Combustion Reactions
A chemical reaction is taking place at the gas tap!


    C3H8
           (g)
                 +5O2        (g)
                                       heat
                                                        3CO2 +4H2O (g)           (g)
    propane    +        oxygen                        carbon dioxide +   water




     Is it balanced?



                                   Reactants                 Products
                    C                   3                       1 3
                    O                2 10                     3 6 10
                    H                   8                       2 8
Combustion Reactions                                         Do NOT try these at home.
Alcohols will also go through combustion reactions.



_CH3OH(l) + _O2(g)                         heat
                                                       ___ (g) + ____ (g)
   methanol          + oxygen                         carbon dioxide +    water




                         http://www.youtube.com/watch?v=SJCcH0ATMQ4
Combustion Reactions                                           Do NOT try these at home.
Alcohols will go through combustion reactions.



_CH3OH(l) + _O2(g)                         heat
                                                         _CO2(g) + _H2O(g)
   methanol          + oxygen                            carbon dioxide +   water


     Balance it!
                        Reactants                 Products
          C                  1                       1
          O                  3                       3
          H                  4                       2
Combustion Reactions                                         Do NOT try these at home.
Alcohols will go through combustion reactions.



2CH3OH(l) + 3O2(g)                         heat
                                                       2CO2(g) + 4H2O(g)
   methanol          + oxygen                         carbon dioxide +    water


     Balance it!
                        Reactants                 Products
          C                1 2                      1 2
          O                3 8                      3 8
          H                4 8                      2 8
Types of Reactions

                 A+B        AB         AB             A+B




                         replacement




                                       replacement
                                          double
                            single
     AB + C     CB + A                               AB + CD    AD + BC



                                                        heat
 H[A] + [B]OH     [B][A] + H2O         CxHx + O2               CO2 + H2O
Single- & double-replacement and neutralisation reactions
                             HCl &
               NaOH        universal
                           indicator   HCl
                                                   AgNO3

                                         NaCl


       H2O
                                                                HCl



                                                CuSO4
                                                                      NaHCO3
                                 Mg
                                                           Fe

   Two white solids. Which is
    PbNO3 and which is KI?


                                                                               45
Single Replacement Reactions
These can be simplified as AB + C  A + BC
Where an element trades places with another element in a compound.


   +      -          +                                +      -        +
       HCl           + Mg                              MgCl2          +    H2
              (aq)           (s)                             (aq)              (g)
         hydrogen peroxide                       magnesium chloride   +   hydrogen


                         Reactants               Products             balanced?
           Cl
          Mg
              H
Single Replacement Reactions
These can be simplified as AB + C  A + BC
Where an element trades places with another element in a compound.


   +      -          +                                   +   -        +
       HCl           + Mg                                MgCl2        +    H2
              (aq)           (s)                             (aq)              (g)
         hydrogen peroxide                       magnesium chloride   +   hydrogen


                         Reactants               Products             balanced?
           Cl                1                       2
          Mg                 1                       1
              H              1                       2
Single Replacement Reactions
These can be simplified as AB + C  A + BC
Where an element trades places with another element in a compound.


   +      -          +                                   +   -        +

   2HCl +     (aq)
                         Mg
                              (s)
                                                         MgCl2        +    H2
                                                             (aq)              (g)
         hydrogen peroxide                       magnesium chloride   +   hydrogen


                         Reactants               Products             balanced?
           Cl                1 2                     2
          Mg                  1                      1
              H              1 2                     2
Types of Reactions

                 A+B        AB         AB             A+B




                         replacement




                                       replacement
                                          double
                            single
     AB + C     CB + A                               AB + CD    AD + BC



                                                        heat
 H[A] + [B]OH     [B][A] + H2O         CxHx + O2               CO2 + H2O
Double Replacement Reactions
 These can be simplified as AB + CD  AD + CB
 Where the anions and cations of two compounds trade places.


   +        -         +     +       -                       +       -          +       +       -



       KI        + Pb(NO3)2                                  KNO3              +        PbI2
        (aq)                             (aq)                           (aq)            (s)
potassium iodide +        lead nitrate                    potassium nitrate + lead iodide

                                Reactants               Products                   balanced?
                 K
                 I
                Pb
                NO3
            Nitrate is a polyatomic ion and must be kept together
Double Replacement Reactions
 These can be simplified as AB + CD  AD + CB
 Where the anions and cations of two compounds trade places.


   +        -         +     +       -                       +       -          +       +       -



       KI        + Pb(NO3)2                                     KNO3           +        PbI2
        (aq)                             (aq)                           (aq)            (s)
potassium iodide +        lead nitrate                    potassium nitrate + lead iodide

                                Reactants               Products                   balanced?
                 K                  1                       1
                 I                  1                       2
                Pb                  1                       1
                NO3                 2                       1
            Nitrate is a polyatomic ion and must be kept together
Double Replacement Reactions
 These can be simplified as AB + CD  AD + CB
 Where the anions and cations of two compounds trade places.


   +        -         +     +       -                       +       -          +       +       -



       KI
        (aq)
                 + Pb(NO3)2                               2KNO3 +                       PbI2
                                         (aq)                           (aq)            (s)
potassium iodide +        lead nitrate                    potassium nitrate + lead iodide

                                Reactants               Products                   balanced?
                 K                  1                      1 2
                 I                  1                       2
                Pb                  1                       1
                NO3                 2                      1 2
            Nitrate is a polyatomic ion and must be kept together
Double Replacement Reactions
 These can be simplified as AB + CD  AD + CB
 Where the anions and cations of two compounds trade places.


   +      -          +      +       -                     +       -          +       +       -



  2KI + (aq)
                         Pb(NO3)2                       2KNO3 +                       PbI2
                                         (aq)                         (aq)            (s)
potassium iodide +        lead nitrate                  potassium nitrate + lead iodide

                                Reactants             Products                   balanced?
                K                  1 2                   1 2
                I                  1 2                    2
               Pb                   1                     1
               NO3                  2                    1 2
          Nitrate is a polyatomic ion and must be kept together
Let’s look at that again…
       KI      + Pb(NO3)2                     KNO3            +     PbI2
        (aq)                         (aq)              (aq)               (s)
potassium iodide +   lead nitrate           potassium nitrate + lead iodide

Which ions form?
                         +
 K                 K
                             2+
Pb                 Pb
                             -
   I                 I
  And the polyatomic ion
                                 -
                   NO3
Let’s look at that again…
     KI         + Pb(NO3)2                                            KNO3            +           PbI2
         (aq)                               (aq)                               (aq)             (s)
potassium iodide +           lead nitrate                         potassium nitrate + lead iodide


    +           -                                                 +                                      -
                                                                               -
K          I                                       -         K NO3                                 I
                                2+   NO3                                                     2+
                        Pb                         -                               Pb                    -
The 2+ lead cation
needs to be balanced                 NO3                                                           I
by two single anions.
                                  The total number of atoms on each side are not balanced.
                                            Reactants                 Products
                        K                      1                          1
                        I                      1                          2
                        Pb                     1                          1
                    NO3                        2                          1
Let’s look at that again…
 2KI + Pb(NO3)2
        (aq)
                        2KNO3 +                                                       PbI2
                                        (aq)                            (aq)              (s)
potassium iodide +       lead nitrate                       potassium nitrate + lead iodide


    +          -                                            +                                -
                                                                        -
K        I                                     -           K NO3                       I
                            2+   NO3                                             2+

    +          -     Pb                        -            +           -
                                                                            Pb               -
K        I                       NO3                       K NO3                       I
                                           Now they are.
                                        Reactants               Products
                     K                    1 2                     1 2
                     I                    1 2                      2
                   Pb                      1                       1
                   NO3                     2                      1 2
Types of Reactions

                 A+B        AB         AB             A+B




                         replacement




                                       replacement
                                          double
                            single
     AB + C     CB + A                               AB + CD    AD + BC



                                                        heat
 H[A] + [B]OH     [B][A] + H2O         CxHx + O2               CO2 + H2O
Neutralisation Reactions
  These can be simplified as HA + BOH  H20 + BA
  Where the acid (HA) is neutralized by the base (BOH), giving water and a salt (AB).


      H[A]          + [B]OH(aq)
                 (aq)
                                                                 [B][A] + H2O
                                                                                (g)                  (g)
          acid     +        base                                       salt           +      water

                                                     These brackets don’t get used in equations –
                                                     they are just there to show what is happening
    e.g

      HCl           + NaOH(aq)
                 (aq)
                                                                  NaCl + H2O
                                                                       (aq)                          (g)
hydrochloric acid + sodium hydroxide                     sodium chloride +                  water
                                    Reactants                      Products
                       Cl
                       Na
                       O
                       H
Neutralisation Reactions
  These can be simplified as HA + BOH  H20 + AB
  Where the acid (HA) is neutralized by the base (BOH), giving water and a salt (BA).


      H[A]          + [B]OH(aq)
                 (aq)
                                                                 [B][A] + H2O
                                                                                (g)                  (g)
          acid     +        base                                       salt           +      water

                                                     These brackets don’t get used in equations –
                                                     they are just there to show what is happening
    e.g

      HCl           + NaOH(aq)
                 (aq)
                                                                  NaCl + H2O
                                                                       (aq)                          (g)
hydrochloric acid + sodium hydroxide                     sodium chloride +                  water
                                    Reactants                      Products
                       Cl                1                               1
                       Na                1                               1
                       O                 1                               1
                       H                 2                               2
Types of Reactions

                 A+B        AB         AB             A+B




                         replacement




                                       replacement
                                          double
                            single
     AB + C     CB + A                               AB + CD    AD + BC



                                                        heat
 H[A] + [B]OH     [B][A] + H2O         CxHx + O2               CO2 + H2O
Balancing Equation Practice
 Now try the activities on this PhET simulation to
       help practice balancing equations.

                           1. Complete the introduction stage.
                           2. Some of the examples are on the sheet.
                           3. Try the challenge quizzes.



                          http://phet.colorado.edu/en/simulation/balan
                          cing-chemical-equations
Classify and balance these…
 Cell respiration?

 C6H12O6
               (s)
                     + O2 (g)     heat
                                              CO2 + H2O
                                                      (g)           (g)
     glucose         +   oxygen          carbon dioxide +   water
Housekeeping class
Today we need to make sure everyone is up to date on all work and can
understand balancing and reactions.
    1.   Check all One World work has been submitted.
    2.   Check in with incomplete elements task people.
    3.   Work through last week’s reactions and balance them.
    4.   Turn these sheets back in to be checked again.


    If you have completed everything and are all up to date you can:
    • practice balancing and naming using the resources on the GoogleSite
    • Find out more about the ‘Mole’ and stoichiometry

    MrT’s promise:
    • All Chem work will be checked and graded by Thursday
    • If you performed poorly in One World you can do another essay or
      article in your own time. Due 16 Jan at the very latest.
For more resources.

                                      Please consider a donation to charity via Biology4Good.
                      Click here for more information about Biology4Good charity donations.
This is a Creative Commons presentation. It may be linked and embedded but not sold or re-hosted.

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Reactions & Formulas

  • 1. + - + + - + - + + - Reactions & Formulas Introductory Chemistry Canadian Academy MrT draft presentation – to be updated
  • 2. The magnesium is combusting. The magnesium is combining with oxygen. There is a physical change but not a chemical change. 2
  • 3. Reactions & Formulas Assessment Statements • Name simple ionic and covalent compounds from their formula. • Write formulas for simple ionic and covalent compounds based on their name. • Write word equations for reactions. • Identify reactants and products in reactions. • Apply state symbols to equations. • Balance simple formula equations. • Identify characteristics of reactions: • ∆ colour • ∆ temperature (exothermic or endothermic) • precipitate formation • gas production • ∆ pH • Use conditions for reactions appropriately above the arrow in the equation (heat, catalyst etc). • Recognise six types of reaction: synthesis, decomposition, single replacement, double replacement, combustion and neutralisation.
  • 4. 1 2 13 14 15 16 17 18 +1 +2 -3 -2 -1 non-metals Periodic table from: http://www.elementsdatabase.com/
  • 5. +1 +2 -3 -2 -1 non-metals http://commons.wikimedia.org/wiki/Periodic_Table_of_Elements
  • 6. How do we know a reaction has taken place? • ∆ colour (∆ = ‘change in’) • ∆ temperature (exothermic or endothermic) • ∆ pH • precipitate formation • gas production Which of these signs of a chemical reaction have we come across in our reactions so far?
  • 7. Naming Ions Remember: metals bonding with non-metals form ionic bonds. Some ions are polyatomic. This means they are made of groups of atoms which stay together in reactions – such as carbonates. What do the elemental anions have in common in their name? What do the polyatomic anions have in common in their name (except hydroxide)? What is the difference between the iron (II) and iron (III) ions?
  • 8. Naming Ionic Compounds Rules: • balance the charges • keep polyatomic ions together Examples: HCl hydrogen chloride NaOH sodium hydroxide ZnCl2 zinc chloride Fe2O3 iron oxide NaOH sodium hydroxide Pb(NO3)2 lead nitrate
  • 9. Naming Covalent Molecules Remember: You can only correctly call it a molecule if it is covalently-bonded. Covalent bonds form between non-metal atoms. Name the compound this way: • You don’t need mono- if the first atom is single • Use the prefixes for all other atoms Examples: CO carbon monoxide CO2 carbon dioxide N2O3 dinitrogen trioxide CF4 N2O4 N2H4 H2O
  • 10. Conventions in Writing Reactions reactants products conditions for reaction to occur (e.g. heat, catalysts) symbol equation Mg (s) + O2 (g) heat MgO (s) magnesium + oxygen magnesium oxide “gives” word equation State symbols need to be included: (s) solid – this included precipitates (g) gas (l) liquid (aq) aqueous solution: solutes dissolved in water state symbols should be subscripted
  • 11. Wait! The reactants and products are not balanced Mg (s) + O2 (g) heat MgO (s) magnesium + oxygen magnesium oxide
  • 12. Balancing Equations The Law of Conservation of Mass states that matter is neither created nor destroyed. There MUST be the same number of atoms on each side of the equation. Mg (s) + O2 (g) heat MgO (s) magnesium + oxygen magnesium oxide Reactants Products Mg 1 1 O 2 1 Simple steps for balancing equations: 1. List & count the elements and groups on each side of the equation. Don’t split polyatomic ions. 2. Select the compound with the greatest number of atoms (not counting H and O). 3. Balance the atoms in this compound on both sides of the equation. 4. Don’t change any compounds. 5. Balance any groups, such as polyatomic ions. 6. Finish up with H and O.
  • 13. Balancing Equations The Law of Conservation of Mass states that matter is neither created nor destroyed. There MUST be the same number of atoms on each side of the equation. Mg (s) + O2 (g) heat 2MgO (s) magnesium + oxygen magnesium oxide Reactants Products Mg 1 1 2 O 2 1 2 Simple steps for balancing equations: 1. List & count the elements and groups on each side of the equation. Don’t split polyatomic ions. 2. Select the compound with the greatest number of atoms (not counting H and O). 3. Balance the atoms in this compound on both sides of the equation. 4. Don’t change any compounds. 5. Balance any groups, such as polyatomic ions. 6. Finish up with H and O.
  • 14. Balancing Equations The Law of Conservation of Mass states that matter is neither created nor destroyed. There MUST be the same number of atoms on each side of the equation. 2Mg (s) + O2 (g) heat 2MgO (s) magnesium + oxygen magnesium oxide Reactants Products Mg 1 2 1 2 O 2 1 2 Two molecules of Mg are needed to react with one molecule of O2, giving 2 MgO. Simple steps for balancing equations: 1. List & count the elements and groups on each side of the equation. Don’t split polyatomic ions. 2. Select the compound with the greatest number of atoms (not counting H and O). 3. Balance the atoms in this compound on both sides of the equation. 4. Don’t change any compounds. 5. Balance any groups, such as polyatomic ions. 6. Finish up with H and O.
  • 15. Types of Reactions A+B AB AB A+B replacement replacement double single AB + C CB + A AB + CD AD + BC heat H[A] + [B]OH [B][A] + H2O CxHx + O2 CO2 + H2O
  • 16. Synthesis Reactions These can be simplified as A + B  AB Where two or more reactants combine to make a single product. + CO2 + H2O H2CO3 (g) (l) (aq) carbon dioxide + water carbonic acid Reactants Products balanced? C O H
  • 17. Synthesis Reactions These can be simplified as A + B  AB Where two or more reactants combine to make a single product. + CO2 + H2O H2CO3 (g) (l) (aq) carbon dioxide + water carbonic acid Reactants Products balanced? C 1 1 O 3 3 H 2 2
  • 18. Types of Reactions A+B AB AB A+B replacement replacement double single AB + C CB + A AB + CD AD + BC heat H[A] + [B]OH [B][A] + H2O CxHx + O2 CO2 + H2O
  • 19. Decomposition Reactions These can be simplified as AB  A + B Where a single reactant breaks down into component elements or compounds. + MnO2 H2O2 H2O + O2 (l) (l) (g) hydrogen peroxide water + oxygen MnO2 acts as a catalyst in this reaction. It allows the reaction to take place more quickly but is not used up. We put it above the arrow. It can be recovered and reused in another reaction. MnO2
  • 20. Decomposition Reactions These can be simplified as AB  A + B Where a single reactant breaks down into component elements or compounds. + MnO2 H2O2 H2O + O2 (l) (l) (g) hydrogen peroxide water + oxygen MnO2 acts as a catalyst in this reaction. It allows the reaction to take place more quickly but is not used up. We put it above the arrow. It can be recovered and reused in another reaction. MnO2
  • 21. Decomposition Reactions These can be simplified as AB  A + B Where a single reactant breaks down into component elements or compounds. + MnO2 H2O2 H2O + O2 (l) (l) (g) hydrogen peroxide water + oxygen MnO2 acts as a catalyst in this reaction. It allows the reaction to take place more quickly but is not used up. We put it above the arrow. It can be recovered and reused in another reaction. Enzymes are catalysts found in living organisms. They are proteins with an active site. MnO2
  • 22. Decomposition Reactions These can be simplified as AB  A + B Where a single reactant breaks down into component elements or compounds. + MnO2 H2O2 H2O + O2 (l) (l) (g) hydrogen peroxide water + oxygen Reactants Products balanced? O H
  • 23. Decomposition Reactions These can be simplified as AB  A + B Where a single reactant breaks down into component elements or compounds. + MnO2 H2O2 H2O + O2 (l) (l) (g) hydrogen peroxide water + oxygen Reactants Products balanced? O 2 3 H 2 2
  • 24. Decomposition Reactions These can be simplified as AB  A + B Where a single reactant breaks down into component elements or compounds. + MnO2 H2O2 (l) 2H2O + (l) O2 (g) hydrogen peroxide water + oxygen Reactants Products balanced? O 2 3 4 H 2 2 4
  • 25. Decomposition Reactions These can be simplified as AB  A + B Where a single reactant breaks down into component elements or compounds. + 2H2O2 MnO2 2H2O + O2 (l) (l) (g) hydrogen peroxide water + oxygen Reactants Products balanced? O 2 4 3 4 H 2 4 2 4
  • 26. Decomposition Reactions These can be simplified as AB  A + B Where a single reactant breaks down into component elements or compounds. Heat Heat CuSO4.5H2O CuSO4 + 5H2O (g) (s) (s) copper (II) sulphate pentahydrate copper (II) sulphate + water
  • 27. Decomposition Reactions These can be simplified as AB  A + B Where a single reactant breaks down into component elements or compounds. Heat + Heat CuSO4.5H2O CuSO4 + 5H2O (g) (s) (s) copper (II) sulphate pentahydrate copper (II) sulphate + water
  • 28. 28
  • 29. Danger: dihydrogen monoxide! Lethal if inhaled. Found in disaster zones. Reduces the effectiveness of brakes. Found in tumour cells, viruses and deadly bacteria. Contributes to electrocutions. Used by terrorists and pirates. Find out more about this lethal substance: http://www.dhmo.org/facts.html
  • 30. Ionic Covalent • Don’t use mono-, di- etc in prefixes. • Endings usually –ide. • Cation, then anion • Don’t need mono- prefix for first e.g. lithium bromide. atom if it is single (e.g. CH4) • Don’t break up polyatomic ions. • Name in order of the periodic table, but H is before O Remember that in ionic compounds, the sum of the charges must be zero. Therefore sodium sulphide is Na2S, not NaS. 30
  • 31. Types of Reactions A+B AB AB A+B replacement replacement double single AB + C CB + A AB + CD AD + BC heat H[A] + [B]OH [B][A] + H2O CxHx + O2 CO2 + H2O
  • 32. Combustion Reactions This is the combustion (burning) of a hydrocarbon (contains C and H), in oxygen. Complete combustion results in the products water and carbon dioxide. CxHx () + O2 (g) heat CO2 + H2O (g) (g) hydrocarbon + oxygen carbon dioxide + water e.g CH4 (g) + O2 (g) heat CO2 + H2O (g) (g) methane + oxygen carbon dioxide + water Reactants Products C 1 1 O 2 3 H 4 2
  • 33. Combustion Reactions This is the combustion (burning) of a hydrocarbon (contains C and H), in oxygen. Complete combustion results in the products water and carbon dioxide. CxHx () + O2 (g) heat CO2 + H2O (g) (g) hydrocarbon + oxygen carbon dioxide + water e.g CH4 + O2 (g) heat CO2 +2H2O (g) (g) (g) methane + oxygen carbon dioxide + water Reactants Products C 1 1 O 2 3 4 H 4 2 4
  • 34. Combustion Reactions This is the combustion (burning) of a hydrocarbon (contains C and H), in oxygen. Complete combustion results in the products water and carbon dioxide. CxHx () + O2 (g) heat CO2 + H2O (g) (g) hydrocarbon + oxygen carbon dioxide + water e.g CH4 (g) + 2O2 (g) heat CO2 +2H2O (g) (g) methane + oxygen carbon dioxide + water Reactants Products C 1 1 O 2 4 3 4 H 4 2 4
  • 35. Combustion Reactions A chemical reaction is taking place at the gas tap! C3H8 (g) + O2 (g) heat CO2 + H2O (g) (g) propane + oxygen carbon dioxide + water Which product of one of the reactions we’ve carried out already could be used to test if the condensation really is water? Is propane a covalent or ionic compound? What’s an alternative name for propane, based on the naming conventions we have just learned?
  • 36. Combustion Reactions A chemical reaction is taking place at the gas tap! C3H8 (g) + O2 (g) heat CO2 + H2O (g) (g) propane + oxygen carbon dioxide + water Is it balanced? Reactants Products C O H
  • 37. Combustion Reactions A chemical reaction is taking place at the gas tap! C3H8 (g) + O2 (g) heat CO2 + H2O (g) (g) propane + oxygen carbon dioxide + water Is it balanced? Reactants Products C 3 1 O 2 3 H 8 2
  • 38. Combustion Reactions A chemical reaction is taking place at the gas tap! C3H8 (g) + O2 (g) heat 3CO2 (g) + H2O (g) propane + oxygen carbon dioxide + water Is it balanced? Reactants Products C 3 1 3 O 2 3 6 H 8 2
  • 39. Combustion Reactions A chemical reaction is taking place at the gas tap! C3H8 (g) + O2 (g) heat 3CO2 +4H2O (g) (g) propane + oxygen carbon dioxide + water Is it balanced? Reactants Products C 3 1 3 O 2 3 6 10 H 8 2 8
  • 40. Combustion Reactions A chemical reaction is taking place at the gas tap! C3H8 (g) +5O2 (g) heat 3CO2 +4H2O (g) (g) propane + oxygen carbon dioxide + water Is it balanced? Reactants Products C 3 1 3 O 2 10 3 6 10 H 8 2 8
  • 41. Combustion Reactions Do NOT try these at home. Alcohols will also go through combustion reactions. _CH3OH(l) + _O2(g) heat ___ (g) + ____ (g) methanol + oxygen carbon dioxide + water http://www.youtube.com/watch?v=SJCcH0ATMQ4
  • 42. Combustion Reactions Do NOT try these at home. Alcohols will go through combustion reactions. _CH3OH(l) + _O2(g) heat _CO2(g) + _H2O(g) methanol + oxygen carbon dioxide + water Balance it! Reactants Products C 1 1 O 3 3 H 4 2
  • 43. Combustion Reactions Do NOT try these at home. Alcohols will go through combustion reactions. 2CH3OH(l) + 3O2(g) heat 2CO2(g) + 4H2O(g) methanol + oxygen carbon dioxide + water Balance it! Reactants Products C 1 2 1 2 O 3 8 3 8 H 4 8 2 8
  • 44. Types of Reactions A+B AB AB A+B replacement replacement double single AB + C CB + A AB + CD AD + BC heat H[A] + [B]OH [B][A] + H2O CxHx + O2 CO2 + H2O
  • 45. Single- & double-replacement and neutralisation reactions HCl & NaOH universal indicator HCl AgNO3 NaCl H2O HCl CuSO4 NaHCO3 Mg Fe Two white solids. Which is PbNO3 and which is KI? 45
  • 46. Single Replacement Reactions These can be simplified as AB + C  A + BC Where an element trades places with another element in a compound. + - + + - + HCl + Mg MgCl2 + H2 (aq) (s) (aq) (g) hydrogen peroxide magnesium chloride + hydrogen Reactants Products balanced? Cl Mg H
  • 47. Single Replacement Reactions These can be simplified as AB + C  A + BC Where an element trades places with another element in a compound. + - + + - + HCl + Mg MgCl2 + H2 (aq) (s) (aq) (g) hydrogen peroxide magnesium chloride + hydrogen Reactants Products balanced? Cl 1 2 Mg 1 1 H 1 2
  • 48. Single Replacement Reactions These can be simplified as AB + C  A + BC Where an element trades places with another element in a compound. + - + + - + 2HCl + (aq) Mg (s) MgCl2 + H2 (aq) (g) hydrogen peroxide magnesium chloride + hydrogen Reactants Products balanced? Cl 1 2 2 Mg 1 1 H 1 2 2
  • 49. Types of Reactions A+B AB AB A+B replacement replacement double single AB + C CB + A AB + CD AD + BC heat H[A] + [B]OH [B][A] + H2O CxHx + O2 CO2 + H2O
  • 50. Double Replacement Reactions These can be simplified as AB + CD  AD + CB Where the anions and cations of two compounds trade places. + - + + - + - + + - KI + Pb(NO3)2 KNO3 + PbI2 (aq) (aq) (aq) (s) potassium iodide + lead nitrate potassium nitrate + lead iodide Reactants Products balanced? K I Pb NO3 Nitrate is a polyatomic ion and must be kept together
  • 51. Double Replacement Reactions These can be simplified as AB + CD  AD + CB Where the anions and cations of two compounds trade places. + - + + - + - + + - KI + Pb(NO3)2 KNO3 + PbI2 (aq) (aq) (aq) (s) potassium iodide + lead nitrate potassium nitrate + lead iodide Reactants Products balanced? K 1 1 I 1 2 Pb 1 1 NO3 2 1 Nitrate is a polyatomic ion and must be kept together
  • 52. Double Replacement Reactions These can be simplified as AB + CD  AD + CB Where the anions and cations of two compounds trade places. + - + + - + - + + - KI (aq) + Pb(NO3)2 2KNO3 + PbI2 (aq) (aq) (s) potassium iodide + lead nitrate potassium nitrate + lead iodide Reactants Products balanced? K 1 1 2 I 1 2 Pb 1 1 NO3 2 1 2 Nitrate is a polyatomic ion and must be kept together
  • 53. Double Replacement Reactions These can be simplified as AB + CD  AD + CB Where the anions and cations of two compounds trade places. + - + + - + - + + - 2KI + (aq) Pb(NO3)2 2KNO3 + PbI2 (aq) (aq) (s) potassium iodide + lead nitrate potassium nitrate + lead iodide Reactants Products balanced? K 1 2 1 2 I 1 2 2 Pb 1 1 NO3 2 1 2 Nitrate is a polyatomic ion and must be kept together
  • 54. Let’s look at that again… KI + Pb(NO3)2 KNO3 + PbI2 (aq) (aq) (aq) (s) potassium iodide + lead nitrate potassium nitrate + lead iodide Which ions form? + K K 2+ Pb Pb - I I And the polyatomic ion - NO3
  • 55. Let’s look at that again… KI + Pb(NO3)2 KNO3 + PbI2 (aq) (aq) (aq) (s) potassium iodide + lead nitrate potassium nitrate + lead iodide + - + - - K I - K NO3 I 2+ NO3 2+ Pb - Pb - The 2+ lead cation needs to be balanced NO3 I by two single anions. The total number of atoms on each side are not balanced. Reactants Products K 1 1 I 1 2 Pb 1 1 NO3 2 1
  • 56. Let’s look at that again… 2KI + Pb(NO3)2 (aq) 2KNO3 + PbI2 (aq) (aq) (s) potassium iodide + lead nitrate potassium nitrate + lead iodide + - + - - K I - K NO3 I 2+ NO3 2+ + - Pb - + - Pb - K I NO3 K NO3 I Now they are. Reactants Products K 1 2 1 2 I 1 2 2 Pb 1 1 NO3 2 1 2
  • 57. Types of Reactions A+B AB AB A+B replacement replacement double single AB + C CB + A AB + CD AD + BC heat H[A] + [B]OH [B][A] + H2O CxHx + O2 CO2 + H2O
  • 58. Neutralisation Reactions These can be simplified as HA + BOH  H20 + BA Where the acid (HA) is neutralized by the base (BOH), giving water and a salt (AB). H[A] + [B]OH(aq) (aq) [B][A] + H2O (g) (g) acid + base salt + water These brackets don’t get used in equations – they are just there to show what is happening e.g HCl + NaOH(aq) (aq) NaCl + H2O (aq) (g) hydrochloric acid + sodium hydroxide sodium chloride + water Reactants Products Cl Na O H
  • 59. Neutralisation Reactions These can be simplified as HA + BOH  H20 + AB Where the acid (HA) is neutralized by the base (BOH), giving water and a salt (BA). H[A] + [B]OH(aq) (aq) [B][A] + H2O (g) (g) acid + base salt + water These brackets don’t get used in equations – they are just there to show what is happening e.g HCl + NaOH(aq) (aq) NaCl + H2O (aq) (g) hydrochloric acid + sodium hydroxide sodium chloride + water Reactants Products Cl 1 1 Na 1 1 O 1 1 H 2 2
  • 60. Types of Reactions A+B AB AB A+B replacement replacement double single AB + C CB + A AB + CD AD + BC heat H[A] + [B]OH [B][A] + H2O CxHx + O2 CO2 + H2O
  • 61. Balancing Equation Practice Now try the activities on this PhET simulation to help practice balancing equations. 1. Complete the introduction stage. 2. Some of the examples are on the sheet. 3. Try the challenge quizzes. http://phet.colorado.edu/en/simulation/balan cing-chemical-equations
  • 62. Classify and balance these… Cell respiration? C6H12O6 (s) + O2 (g) heat CO2 + H2O (g) (g) glucose + oxygen carbon dioxide + water
  • 63. Housekeeping class Today we need to make sure everyone is up to date on all work and can understand balancing and reactions. 1. Check all One World work has been submitted. 2. Check in with incomplete elements task people. 3. Work through last week’s reactions and balance them. 4. Turn these sheets back in to be checked again. If you have completed everything and are all up to date you can: • practice balancing and naming using the resources on the GoogleSite • Find out more about the ‘Mole’ and stoichiometry MrT’s promise: • All Chem work will be checked and graded by Thursday • If you performed poorly in One World you can do another essay or article in your own time. Due 16 Jan at the very latest.
  • 64. For more resources. Please consider a donation to charity via Biology4Good. Click here for more information about Biology4Good charity donations. This is a Creative Commons presentation. It may be linked and embedded but not sold or re-hosted.