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Chemical Changes

Chemical Changes. Ch. 12 - Lesson 5 p. E68 – E77. Physical change - When matter changes in size, shape, or state without changing what it is. Chemical change – A change of matter that occurs when atoms link together in a new way creating a new substance different than the original substance.

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Chemical Changes

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  1. Chemical Changes Ch. 12 - Lesson 5 p. E68 – E77

  2. Physical change - When matter changes in size, shape, or state without changing what it is

  3. Chemical change – A change of matter that occurs when atoms link together in a new way creating a new substance different than the original substance

  4. Examples of Chemical Changes

  5. Chemical reaction – Another name for a chemical change.

  6. Reactants – Original substance before it goes through a chemical reaction

  7. Products – The new substances produced after a chemical change (reaction)

  8. Signs of a chemical change • Color change – Blueberry juice and baking soda will turn green • Formation of a gas – Vinegar and baking soda will form carbon dioxide • Formation of light and heat – Lighting a gas grill

  9. Questions • What is the difference between a chemical and physical change? • What happens during a chemical change? • What are three signs of a chemical change? • Why are chemical changes more difficult to reverse than physical changes?

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