Picture Walk. Physical and Chemical Changes Unit 2—Part II.

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Presentation transcript:

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

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

3-2-1 Summarize!!! Write 3 facts you wrote in your notes in complete sentences. Write 2 facts given to you verbally that you did NOT write down in complete sentences. Write 1 question that presented itself to you while taking notes.