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Ch. 11Lesson 3What are chemical
changes in matter?
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chemical change
•one kind of matter changes into a different kind of matter
•makes new substances
Sugar and sulfuric acid chemical change
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chemical change
•usually cannot be changed back to the original kind of matter
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Physical change vs. chemical change
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chemical change
•some happen quickly
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Fast Chemical Reactions [00:44]
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chemical change
•some happen slowly
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Slow Chemical Changes in Matter [01:10]
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examples of chemical changes
1. baking bread
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examples of chemical changes
2. burning wood
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examples of chemical changes
3. iron rusting
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examples of chemical changes
4. cooking eggs
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examples of chemical changes
5. fireworks
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examples of chemical changes
6. using a battery
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examples of chemical changes
7. digesting food
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examples of chemical changes
8. baking a cake
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Review time
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How do you know burning wood is a chemical change?
•When the wood burns, the wood changes to gases and ashes. The gases and ashes are a different kind of matter.
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How do you know baked bread has undergone a chemical change?
•The ingredients cannot be changed back to their original form.
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What is an example of a slow chemical change?
•rusting iron
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What is an example of a fast chemical change?
•burning wood
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How is a chemical change different from a physical change?
•Chemical changes produce new kinds of matter, but physical changes do not.
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When does your body produce chemical changes?
•When it breaks down food for energy and growth.
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• wood chemical change ashes