Question

how do you known a chemical reaction has taken place

Answer 1

Hi dost this is the answer
We can tell if a chemical reaction has taken placewhen one or more of the following things happen:

There has been a colour change inside the reaction flask.

A gas has formed. Usually we know a gas hasformed when we can see bubbles. ...

A solid has formed.

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Answer 2

hey mate,
here is your answer...

we know that a chemical reaction has taken place because of formation of a new substance (product) that forms after the reaction takes place....

hope it helps...
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