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Physical and Chemical Changes

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Presentation on theme: "Physical and Chemical Changes"— Presentation transcript:

1 Physical and Chemical Changes

2 Physical Changes A change that alters the form or appearance, but does not make the material into a new substance. The properties change, but the particles are still the same. Examples Tearing paper Phase changes Crushing a can

3 Chemical Changes A change in matter that produces a substance with new properties. Both the physical and chemical properties of the substance will be changed.

4 Common Chemical Changes
Burning/Combustion Rusting Tarnishing Digestion Photosynthesis

5 Chemical or Physical Change?
A piece of metal is bent A bracelet turns green A plant makes its own food An apple rots Hair is cut

6 Chemical Reactions A process in which a substance undergoes a chemical change. If a chemical reaction happens, a chemical change has occurred.

7 Types of Chemical Reactions
Exothermic Reaction: Heat EXITS It feels warm Temperature increases Examples: burning wood, “hot hands”

8 Types of Chemical Reactions
Endothermic Reaction: Heat ENTERS Feels cold Temperature decreases Example: cold pack

9 Law of Conservation of Matter
Atoms can rearrange during a chemical reaction but the amount that you start with is the amount that you end with. “Nothing is created nor destroyed”


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