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Get out your reading guide but DO NOT turn it in

Get out your reading guide but DO NOT turn it in. Agenda. AQOD. Name two physical changes. Go over reading guide Notes on Physical and Chemical Changes HW: 2.3 Review Worksheet. Physical and Chemical Changes. Concept of Change. Change: the act of altering a substance. Physical Change.

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Get out your reading guide but DO NOT turn it in

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  1. Get out your reading guide but DO NOT turn it in Agenda AQOD Name two physical changes. • Go over reading guide • Notes on Physical and Chemical Changes • HW: 2.3 Review Worksheet

  2. Physical and Chemical Changes

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

  4. Physical Change • Physical change: a change that occurs that does not change the identity of the substance • Melting ice(change in state or phase) • Freezing Kool-aid • Tearing paper • Boiling water (same as melting ice)

  5. 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 is called a chemical reaction

  6. 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

  7. Conservation of mass • If I have 1003 grams of ice and it melts how many grams of water do I have? • The paper has a mass of 45 grams. If I could collect all of the smoke, ash, etc after burning the paper how many grams would it weigh?

  8. Is it Physical or Chemical?

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