Physical and Chemical Changes

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Physical and Chemical Changes

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Presentation transcript:

Physical and Chemical Changes Unit 5 Matter—Part II 1

Concept of Change Change: the act of altering a substance. 2

2. Physical Change Physical change: a change that occurs that does not change the identity of the substance. Melting ice Freezing Kool-aid Tearing paper Boiling water 3

3. Chemical Changes Chemical change: a change that occurs causing the identity of the substance to change. Burning paper Digesting food Electrolysis of water 4

4. Chemical Changes A chemical change is called a chemical reaction. 5

5. Chemical Changes Cont’d Indicators of a chemical change: Evolution of light Evolution of heat Evolution of a gas Color change Formation of a precipitate 6

6. Is it Physical or Chemical? Change Physical Chemical Melting cheese Burning wood Milk souring Wadding up paper Bicycle rusting 7

THE END