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You know if it's a chemical chagewhen two or more of the following have happened:

1. a precipitate has formed(bubbles)

2. heat is absorbed or released

3. there is a change in odor

4. there is a change in colour

5. the change is diffiult to reverse

6. starting material is used up

7. a material with new properties is formed

A physical change may only be a change in state and the change should be easy to reverse

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15y ago

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