Physical and Chemical Changes

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Physical and Chemical Changes

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Presentation transcript:

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(change in state or phase) Beverly? Freezing Kool-aid Tearing paper Boiling water (same as melting ice)Beverly?

Chemical Changes Chemical change: a change that occurs causing the identity of the substance to change Burning Digesting food Reacting with other substances (give an example per reviewer) 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 (Do all students relate to this?) Wadding up paper Bicycle rusting