Chemical Reactions

Using Everyday Equations Every minute of the day chemical reactions are taking place both in and around you. What makes something a chemical reaction? A chemical reaction involves one or more substances, the reactants, changing into one or more substances, the products. Reactants Products “ ” means “yields” or “reacts to produce.”

Chemical reactions can be described many ways. One is by using a word equation. A word equation is an equation where reactants and products are represented by words. Example: methane + oxygen Word equations, while useful, are cumbersome. To better describe a reaction, writing the formulas is used. A chemical equation uses formulas of reactants (on the left) separated by an arrow from products (on the right). carbon dioxide + water

Example: Fe + O 2 (Skeleton equation) - does not indicate the relative amounts of reactants and products Most often symbols are used to describe the state (i.e., gas, solid, etc.) of each substance Fe 2 O 3

Balancing Chemical Reactions ,[object Object],[object Object]

How do you write a balanced chemical equation? ,[object Object],[object Object],[object Object],[object Object]

Practice ,[object Object],[object Object]

Try to balance this reaction: __Al(OH) 3 (s) + __H 2 SO 4 (aq)  __Al 2 (SO 4 ) 3 (aq) + __H 2 O(l) Al S H O Al S H O 1 1 5 7 2 3 2 13 12 18 8 2 3 6 2 10 3 12 18

Balance these equations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Types of Reactions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Steps to Writing Reactions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

1. Synthesis reactions ,[object Object],[object Object],[object Object],[object Object],[object Object]

Practice ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

2. Decomposition Reactions ,[object Object],[object Object],[object Object],[object Object],[object Object]

Practice ,[object Object],[object Object],[object Object],[object Object]

Practice ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(make Co be +3) Nitrogen monoxide

3. Single Replacement Reactions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Cu + Fe 2 (SO 4 ) 3 NR (no reaction) Zn + Li 2 CO 3 Cu + AlCl 3 Yes, Fe is above Cu No, Ni is below Na Yes, Al is above Cu Cu Hg Ag Ca Mg Al Zn Fe Ni Sn Pb H Au Li Na K Yes, Li is above Zn

[object Object],[object Object],cold H 2 O hot H 2 O steam acid NR A: No for cold, yes if it is hot/steam Mg + H 2 O  H 2 + ZnCl 2 Complete these reactions: Al + H 2 O(steam)  Cu + H 2 O  Ca + H 2 SO 4  Na + H 2 O  H 2 + Mg(OH) 2 H 2 + Al(OH) 3 H 2 + CaSO 4 H 2 + NaOH Q: Zn + HCl  Cu Hg Ag Ca Mg Al Zn Fe Ni Sn Pb H Au Li Na K

[object Object],[object Object],[object Object],[object Object],Other Activity Series Information

Single Replacement Reactions ,[object Object],[object Object],[object Object],[object Object],2

Single Replacement Reactions ,[object Object],[object Object],[object Object],[object Object],[object Object],2 2

4. Double Replacement Reactions ,[object Object],[object Object],[object Object]

Double Replacement Reactions ,[object Object],[object Object],[object Object],[object Object],[object Object],2

5. Combustion Reactions ,[object Object],[object Object]

Combustion Reactions ,[object Object],[object Object],[object Object]

Combustion ,[object Object],[object Object],[object Object],[object Object],5 6 8

Mixed Practice ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Chemical Reactions

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Chemical Reactions