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Physical and Chemical Changes

Explore the fundamental differences between physical and chemical changes. Physical changes occur when a substance changes its shape, size, or phase (e.g., freezing, boiling) without altering its atomic structure. In contrast, chemical changes transform the molecular structure, creating new substances, evidenced by phenomena like burning, gas formation, color change, and precipitate formation. Learn to identify these changes through everyday examples, such as tearing paper (physical) versus burning paper (chemical) or mixing vinegar and baking soda (chemical).

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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 in a substance 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- a substance is left over

  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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