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Chemical reactions can be detected by change in:
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Chemical reactions can be detected by change in:

User Whamma
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A colour change

A gas has formed.

A solid has formed.

User Prostynick
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Answer:

Step-by-step explanation:

We can tell if a chemical reaction has taken place when 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 has formed when we can see bubbles. ...

A solid has formed.

User Sublimemm
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