physical and chemical changes unit ii—part 2. concept of change change: the act of altering a...

Physical and Chemical Changes Unit II—Part 2

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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

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

Page 5: Physical and Chemical Changes Unit II—Part 2. Concept of Change Change: the act of altering a substance

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

Page 6: Physical and Chemical Changes Unit II—Part 2. Concept of Change Change: the act of altering a substance

Is it Physical or Chemical?

Glass breaking

Physical

Is it Physical or Chemical?

Chemical

Burning leaves

Is it Physical or Chemical?

Physical

Butter melting

Is it Physical or Chemical?

Chemical

Fireworks exploding

Is it Physical or Chemical?

Physical

Pouring milk on cereal

Is it Physical or Chemical?

Physical

Mowing a lawn

Is it Physical or Chemical?

Physical

Separating sand and gravel

Is it Physical or Chemical?

Chemical

Bleaching hair

Is it Physical or Chemical?

Chemical

Frying an egg

Is it Physical or Chemical?

Physical

Hammering nails into wood to frame a house

Is it Physical or Chemical?

Chemical

Burning toast

Is it Physical or Chemical?

Physical

Mixing powdered Kool-Aid with water

Is it Physical or Chemical?

Physical

Adding salt to water to gargle

Is it Physical or Chemical?

Chemical

Food spoiling

Is it Physical or Chemical?

Chemical

Rusting bicycle

Is it Physical or Chemical?

Physical

Melting ice cream

Changes

PhysicalChemical

Properties

PhysicalChemical

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