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Physical and Chemical Changes

This lesson explores the concepts of physical and chemical changes in substances. A physical change alters a substance without changing its identity, such as melting ice, freezing Kool-aid, tearing paper, and boiling water. In contrast, a chemical change results in the formation of new substances, characterized by reactions like burning paper, digesting food, and electrolysis of water. Indicators of chemical changes include the evolution of light, heat, gas production, color change, and the formation of a precipitate. Learn to differentiate between physical and chemical changes through practical examples.

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Physical and Chemical Changes

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Presentation Transcript

  1. Physical and Chemical Changes Unit 2—Part II

  2. Concept of Change • Change: the act of altering a substance

  3. 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

  4. 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

  5. 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

  6. Is it Physical or Chemical?

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