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Understanding Physical and Chemical Changes: Key Differences and Examples

This guide explains the distinctions between physical and chemical changes. Physical changes alter the form or appearance of a substance without changing its identity, such as melting, freezing, or cutting. Examples include painting a house or boiling water. In contrast, chemical changes result in new substances and often involve permanent changes in color, gas formation, or temperature fluctuations. Common examples are rusting, baking, and burning. Understanding these concepts helps identify changes in matter in everyday life.

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Understanding Physical and Chemical Changes: Key Differences and Examples

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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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