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Physical and Chemical Changes

Physical and Chemical Changes. Unit II—Part 2. 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( change in state or phase) Beverly? Freezing Kool-aid

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Physical and Chemical Changes

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  1. Physical and Chemical Changes Unit II—Part 2

  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(change in state or phase) Beverly? • Freezing Kool-aid • Tearing paper • Boiling water (same as melting ice)Beverly?

  4. Chemical Changes • Chemical change: a change that occurs causing the identity of the substance to change • Burning • Digesting food • Reacting with other substances (give an example per reviewer) • 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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