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1.3 Observing Changes in Matter

1.3 Observing Changes in Matter. a physical change is the change in appearance or state of a substance…. the composition stays the same. eg) melting, crystallization. Mrs. J. Agnew. slide 1 of 5.

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1.3 Observing Changes in Matter

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  1. 1.3 Observing Changes in Matter

  2. a physical change is the change in appearance or state of a substance… the composition stays the same eg) melting, crystallization Mrs. J. Agnew slide 1 of 5

  3. a chemical change occurs when a substance reacts to form one or more new substances (composition changes) eg) vinegar and baking soda reacting Mrs. J. Agnew slide 2 of 5

  4. Evidence of Chemical Change • colour change • eg) dying clothes 2.change in odour eg) cow emissions Mrs. J. Agnew slide 3 of 5

  5. 3. formation of a solid or gas eg) lead (II) iodide solid 4.change in heat eg) potassium in water Mrs. J. Agnew slide 4 of 5

  6. it is not always easy to tell if a change is physical or chemical • chemical analysis may be needed to determine the type of change Mrs. J. Agnew slide 5 of 5

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