Properties: Physical Or Chemical Worksheet Page 2
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1
2Chemical Changes
•Chemical changes involve the ________________ of a ________
substance. They are often _________________.
•If ______ or more of the following observations take place, then a
_________ change has occurred:
1. Heat is absorbed or produced
2. The starting material is used up
3. A new colour appears
4. A starting colour disappears
5. A material with new properties forms
6. Gas bubbles form in a liquid
7. Grains of solid precipitate form in a liquid
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