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Physical and Chemical Changes

Physical and Chemical Changes. How to tell the difference. Physical Change- physical properties change, but the substance is the same Change in what you see but does not produce a new substance Painting a house, cutting hair, ironing shirt, melting water/boiling water.

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Physical and Chemical Changes

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  1. Physical and Chemical Changes How to tell the difference

  2. Physical Change- • physical properties change, but the substance is the same • Change in what you see but does not produce a new substance • Painting a house, cutting hair, ironing shirt, melting water/boiling water

  3. Some physical changes are reversible, some are not • Reversible—freezing & melting water, braiding hair • Non-reversible—slicing a tomato, peeling an orange

  4. Indicators of a Physical Change

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

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

  7. Chemical Change • Chemical Change- • when substances react to form one or more NEW substances • Look for permanent change in color, gas bubbles, leftover solid • Non-Reversible

  8. Indicators of a Chemical Change

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

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

  11. It’s a chemical change if... • It changes color permanently • It forms a leftover solid

  12. Examples: • Silver ring that turns green • Rusting cars • Copper pennies turning green • Baking powder in cake – cake rises • Vinegar and baking soda • Adding vinegar to milk • Lighting a match • Explosion or burning of wood

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

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

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