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Physical and Chemical Changes

Explore the concepts of physical and chemical changes, including examples, characteristics, and signs of each type of change. Learn how to differentiate between reversible physical changes and irreversible chemical reactions.

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Physical and Chemical Changes

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  1. Physical and Chemical Changes Unit II—Part 2

  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 substance • Usually Reversible

  4. Examples of Physical Change • Melting ice (change in state) • Freezing Kool-Aid • Tearing paper • Breaking Glass

  5. Chemical Changes • Chemical change: a change that occurs causing the substance to change • Is NOT reversible • A chemical change is called a chemical reaction

  6. Examples of Chemical Changes • Burning • Digesting food • Reacting with other substances

  7. Chemical Changes Cont’d • Signs of a chemical change: • Light • Heat • Gas • Colour change* • Formation of a precipitate (solid made from mixing 2 liquids)

  8. Is it Physical or Chemical?

  9. References • Investigating Science Pearson 9 • Dercho

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