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Chemical and physical changes

Chemical and physical changes. Chapter 12. What is a physical change?. A change that occurs when matter changes form (shape, size), but no new type of matter is formed. Examples of physical changes. Changing states of matter Evaporating/condensing Sublimating/depositing Melting/freezing

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Chemical and physical changes

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  1. Chemical and physical changes Chapter 12

  2. What is a physical change? • A change that occurs when matter changes form (shape, size), but no new type of matter is formed

  3. Examples of physical changes • Changing states of matter • Evaporating/condensing • Sublimating/depositing • Melting/freezing • Freezing point of water 0º Celsius • Boiling point of water 100 Celsius

  4. More examples of physical changes • Crushing • Tearing • Chopping • Mixing • Dissolving

  5. How can matter change? Physical Change Chemical Change Changes into a new kind of matter and can’t be reversed A chemical reaction takes place to form a new substance • The material remains the same • Changes in volume, phase of matter, shape, position, or size

  6. Examples of chemical changes • Rusting • Burning • Cooking • Corroding

  7. Physical change or chemical change?

  8. Evidence of chemical change • When a chemical change occurs, atoms rearrange themselves to form a different substance. • Here are some ways you can tell a chemical change has taken place: change of odor, light produced, temperature change, color change

  9. Some types of chemical reactions • Iron (Fe) + oxygen ( rust ( • Sodium (Na +) + chlorine (Cl-)  table salt (NaCl)

  10. Energy changes • In some types of chemical reactions, bonds can break or form, either giving off or using energy. • For example, when something burns, the bonds between the molecules break, giving off light and heat energy. We call this combustion.

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