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How can you be certain that a chemical change has occurred?
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How can you be certain that a chemical change has occurred?

How can you be certain that a chemical change has occurred?-example-1
User ADJenks
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2 Answers

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Yeah answer is A there needs to be a new substance
User Lan
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Answer:

A.) There is at least one substance that was not present before the change.

User Prasad De Silva
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