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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 Freezing Kool-aid Tearing paper Dissolving sugar in water.

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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 • Freezing Kool-aid • Tearing paper • Dissolving sugar in water

  4. Chemical Changes • Chemical change: a change that occurs causing the identity of the substance to change • Burning • Digesting food • Rusting • A chemical change is called a 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? Physical Glass breaking

  7. Is it Physical or Chemical? Chemical Burning leaves

  8. Is it Physical or Chemical? Physical Butter melting

  9. Is it Physical or Chemical? Chemical Fireworks exploding

  10. Is it Physical or Chemical? Physical Pouring milk on cereal

  11. Is it Physical or Chemical? Physical Mowing a lawn

  12. Is it Physical or Chemical? Physical Separating sand and gravel

  13. Is it Physical or Chemical? Chemical Bleaching hair

  14. Is it Physical or Chemical? Chemical Frying an egg

  15. Is it Physical or Chemical? Physical Hammering nails into wood to frame a house

  16. Is it Physical or Chemical? Chemical Burning toast

  17. Is it Physical or Chemical? Physical Mixing powdered Kool-Aid with water

  18. Is it Physical or Chemical? Physical Adding salt to water to gargle

  19. Is it Physical or Chemical? Chemical Food spoiling

  20. Is it Physical or Chemical? Chemical Rusting bicycle

  21. Is it Physical or Chemical? Physical Melting ice cream

  22. Changes PhysicalChemical

  23. Properties Physical Chemical

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