How can we know whether a reaction has taken place or not?
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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.
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Answer:
Reaction has taken place if a new product would be formed or there has been change in the shape, size, colour and density of the object.
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