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What are five kinds of evidence you can use to determine if a chemical reaction has occurred?

one of my science work sheet questions...

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If a new substance has been formed.
If the state of said substance changes.
If the substance seems to have separated its molecules.
If the substance is seeming to boil or move.
Or Maybe if the substance was changing in heat or color.

Also, Im homeschooled so dont blame me if this is wrong!

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anyways thanks,it helped.
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