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Physical and Chemical Changes

Physical and Chemical Changes. Unit 2—Part II. Concept of Change. Change: the act of altering a substance. 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 .

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Physical and Chemical Changes

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  1. Physical and Chemical Changes Unit 2—Part II

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

  3. 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

  4. Chemical Changes • Chemical change: a change that occurs causing the identity of the substance to change • Burning paper • Digesting food • Electrolysis of water • A chemical change is called a chemical reaction

  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. Is it Physical or Chemical?

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