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Physical and Chemical Changes

Learn about physical and chemical changes, distinguishing alterations that retain substance identity or cause a new identity. Explore examples like melting ice or burning reactions.

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Physical and Chemical Changes

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  1. Physical and Chemical Changes

  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 • Digesting food • Reacting with other substances • a chemical change = chemical reaction

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

  6. Is it Physical or Chemical?

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