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3rd Grade Ch. 11 Physical And Chemical Changes
 

3rd Grade Ch. 11 Physical And Chemical Changes

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    3rd Grade Ch. 11 Physical And Chemical Changes 3rd Grade Ch. 11 Physical And Chemical Changes Presentation Transcript

    • How to tell the difference Physical and Chemical Changes
    • Physical Change
      • Substance may seem different, but the way the atoms link up is the same.
    • It’s a physical change if
      • It changes shape or size
      • It dissolves.
      • It changes state (freezes, boils, evaporates, condenses)
      It’s a physical change if...
      • Changes the way the molecules link up
      • Makes new substances
      Chemical Change
    • It’s a chemical change if….
      • It burns
      • Temperature changes without heating/cooling
    • It’s a chemical change if...
      • It bubbles (makes a gas)
    • It’s a chemical change if...
      • It changes color
      • It forms a precipitate
    • What kind of change is it if someone...
      • Tears up paper?
      • Physical change
      • Mixes salt and water?
      • Physical change
    • What kind of change is it if someone...
      • Burns paper?
      • Chemical change
      • Evaporates salt water?
      • Physical change
    • What kind of change is it if someone...
      • Mixes vinegar and baking soda?
      • Chemical change