Physical and Chemical Changes
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Physical and Chemical Changes

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    Physical and Chemical Changes Physical and Chemical Changes Presentation Transcript

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