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Understanding Changes in Matter for Beginners

Explore the distinctions between physical and chemical changes in matter. Identify evidence and examples for each type of change. Discover the importance of chemical analysis in determining the nature of a change.

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Understanding Changes in Matter for Beginners

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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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