Physical and Chemical Changes

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Physical and Chemical Changes

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Presentation transcript:

Physical and Chemical Changes Unit 2—Chemistry

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 Boiling water

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

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

Is it Physical or Chemical? Change Physical Chemical Melting cheese Burning wood Milk souring Wadding up paper Bicycle rusting