Picture Walk. Physical and Chemical Changes Unit 2—Part II.
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Transcript of Picture Walk. Physical and Chemical Changes Unit 2—Part II.
Picture Walk
Physical and Chemical Changes
Unit 2—Part II
What is the Concept of Change?
Change: the act of altering a substance
Describe Physical Changes
Physical change: a change that occurs that does not change the identity of the substance Melting ice Freezing Kool-aid Tearing paper Boiling water
Describe Physical Changes
Indicators of a physical change A change in state- melting, boiling,
vaporization, condensation, or sublimation
A change in form- crushing a can
Describe Chemical Changes
Chemical change: a change that occurs causing the identity of the substance to change Burning paper Digesting food Electrolysis of water
A chemical change is called a chemical reaction
Describe 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
A New Substance Forms
Is it Physical or Chemical?
Change Physical Chemical
Melting cheese
Burning wood
Milk souring
Wadding up paper
Bicycle rusting