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Physical and Chemical Changes

Learn how to differentiate physical changes from chemical changes based on how atoms and molecules interact. Discover the key indicators of each type of change and understand when substances undergo transformations. Enhance your knowledge of scientific principles through practical examples.

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Physical and Chemical Changes

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  1. Physical and Chemical Changes How to tell the difference

  2. PhysicalChange • Substance may seem different, but the way the atoms link up is the same.

  3. It’s a physical change if • It changes shape or size • It dissolves.

  4. It’s a physical change if... • It changes phase (freezes, boils, evaporates, condenses)

  5. Chemical Change • Changes the way the molecules link up • Makes new substances

  6. It’s a chemical change if…. • It burns • Temperature changes without heating/cooling

  7. It’s a chemical change if... • It bubbles (makes a gas)

  8. It’s a chemical change if... • It changes color • It forms a precipitate

  9. What kind of change is it if someone... • Tears up paper? • Physical change • Mixes salt and water? • Physical change

  10. What kind of change is it if someone... • Burns paper? • Chemical change • Evaporates salt water? • Physical change

  11. What kind of change is it if someone... • Mixes vinegar and baking soda? • Chemical change

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