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Physical and Chemical Changes

Discover the fundamental differences between physical and chemical changes in substances. A physical change alters the appearance, size, or phase of a substance without changing its molecular structure. Examples include tearing paper, dissolving salt in water, and phase changes like freezing and boiling. In contrast, a chemical change transforms the molecular structure, creating new substances. This occurs during reactions such as burning paper, rusting, or mixing vinegar and baking soda. Learn to identify these changes through clear examples and definitions.

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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 atom molecules link up • Makes new substances

  6. It’s a chemical change if…. • It burns • Temperature changes (gets hot or cold all by itself)

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

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

  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 • Leaves a bike outside and it RUSTS? • Chemical change

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

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