cocochocolate cocochocolate

28-09-2017
Chemistry

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which of these id an indication that a chemical reaction has occurred?

A) formation of a gas

B) boiling of a substance

C) melting of a substance

D) freezing of a substancd

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28-09-2017

Bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

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apayton1 apayton1

28-09-2017

I think the answer is B

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