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Physical and Chemical Changes
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Physical and Chemical Changes

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Transcript

  • 1. 1. Which picture below represents atoms/molecules in a solid? C 2. Which picture below represents atoms/molecules in a liquid? B 3. Which picture below represents atoms/molecules in a gas? A B. C. A.
  • 2. Review States of matter Solid Liquid Gas Plasma
  • 3. Physical Change Change in matter that does not produce new products May look different, but it’s not a new substance
  • 4. Physical Change Chemical properties are not changed No energy given or taken unless there is a change of state
  • 5. Change of State Molecules gain or lose kinetic energy Melting/freezing, evaporating/condensation
  • 6. Change of State Sublimation Going from a solid to a gas Skips the liquid state
  • 7. Chemical Change Matter changes from one kind of material to another The atoms do not change They rearrange themselves Not “easily” reversed
  • 8. Chemical Change The new substances have new properties Chemical change takes place during a chemical reaction
  • 9. Energy Always a part of a chemical change Given or taken