The document discusses physical and chemical changes. It provides examples of different types of physical changes like changes in shape, size, or phase. Chemical changes are described as creating a new substance. Evidence of chemical changes include color changes, gas production, heat production, precipitate formation, and pH changes. Common chemical reactions like burning and coagulation are discussed.

1. The word contains 7 letters.
Challenge – guess
which word is this?
grape sweet energy blood
single
sugar
respiration
GLUCOSE

2. Reverse energy
Prevent losing heat
Make cells and
repair tissues
Make enzymes
immediately
source of energy

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WHAT PROCESS IS
THIS?
Melting
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WHAT PROCESS IS
THIS?
Chewing
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WHAT PROCESS IS
THIS?
Breaking
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WHAT PROCESS IS
THIS?
Crushing/
Grinding
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WHAT PROCESS IS
THIS?
Dissolving
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WHAT PROCESS IS
THIS?
Cutting
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WHAT IS THE SIMILARITY BETWEEN THOSE PROCESSES?
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CHEMICAL AND
PHYSICAL CHANGE
LESSON 2.1 – CHEM 7

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SUBTITLE GOES HERE
1. PHYSICAL
CHANGE
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This Photo by Unknown Author is licensed under CC BY

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PHYSICAL CHANGE
A physical change alters
the form of a
substance, but does not
change it to another
substance
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ALPINE SKI HOUSE
PHYSICAL CHANGE
Examples of physical
change include:
- Change in shape
- Change in size
- Change in phase
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ALPINE SKI HOUSE
PHYSICAL CHANGE
•Physical changes might be caused by:
• Grinding
• Cutting
• Crushing
• Bending
• Breaking
• Heating/cooling
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PHYSICAL CHANGE
• Physical changes are usually reversible
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WHICH PROCESS IS
THIS?
Digestion:
- Mechanical digestion
(physical change)
- Chemical digestion
(chemical change)
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SUBTITLE GOES HERE
2. CHEMICAL
CHANGE
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ALPINE SKI HOUSE
CHEMICAL CHANGE
A chemical change is a
change in which a
substance is changed
into a different
substance
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CHEMICAL CHANGE
• For example, when iron is heated with sulfur, a new substance – iron
sulfide is formed
• The iron and sulfur have reacted together to form a new substance.
A chemical reaction has taken place
 We can show what happens in a reaction using a word equation:
iron + sulfur  iron sulfide
reactants product
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CHEMICAL CHANGE
What happens in a reaction?
Example: Mg + 2AgNO3  Mg(NO3)2 + 2Ag
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CHEMICAL CHANGE
Examples of chemical changes include:
• Burning
• Rusting
• Decomposing
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WATCH` VIDEO AND
POINT OUT
EVIDENCES SHOWING
A CHEMICAL CHANGE
OCCURRED
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EVIDENCE THAT A CHEMICAL CHANGE HAS OCCURRED
1. A color change
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ALPINE SKI HOUSE
EVIDENCE THAT A CHEMICAL CHANGE HAS OCCURRED
2. A gas is given off
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EVIDENCE THAT A CHEMICAL CHANGE HAS OCCURRED
3. Heat is produced
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EVIDENCE THAT A CHEMICAL CHANGE HAS OCCURRED
4. A precipitate is formed
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EVIDENCE THAT A CHEMICAL CHANGE HAS OCCURRED
5. A change in pH
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DETECTING A CHEMICAL REACTION
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IS COAGULATION A PHYSICAL OR CHEMICAL CHANGE?
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Chemical changes Physical change
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31. I wish you love and peace

32. And in the coming
year, may it bring
you blessings of
prosperity and
success.

33. I hope this holiday
will be full of
surprises and
cheer.

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BURNING
LESSON 2.2 – CHEM 7

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CHEMICAL EQUATION
A + B  C
In the equation:
- The arrow represents the chemical reaction
- The reactants are the substances that react together (A and B)
- The products are the new substances that are made in the
reaction (C)
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BALANCE CHEMICAL EQUATIONS
1. Write the word equation
2. Write the symbol equation
3. Balance the number of atoms of each element
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TITLE HERE
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nec sem convallis, in ornare est accumsan.
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CHART TITLE
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TABLE TITLE GOES HERE
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THANK
YOU
WWW. ALPINESKIHOUSE.COM
VICTORIA LINDQVIST
+1 (589) 555‐0199
victoria@alpineskihouse.com

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