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Do Now: How do you tell the difference between chemical and physical changes?

Do Now: How do you tell the difference between chemical and physical changes?. October 23, 2013. Chemical Properties.

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Do Now: How do you tell the difference between chemical and physical changes?

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  1. Do Now: How do you tell the difference between chemical and physical changes? October 23, 2013

  2. Chemical Properties • Properties that describe how a substance changes into a completely different substance are called chemical properties. Flammability and corrosion/oxidation resistance are examples of chemical properties.

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

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

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

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

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

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

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

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

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

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

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