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

Published byConrad Walters Modified over 8 years ago

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Presentation on theme: "Physical and Chemical Changes Unit II—Part 2. Concept of Change Change: the act of altering a substance."— Presentation transcript:

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? Glass breaking Physical

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 PhysicalChemical

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