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How do scientists know when a chemical change or chemical reaction has taken place.?

How do scientists know when a chemical change or chemical reaction has taken place.?
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How do scientists know when a chemical change or chemical reaction has taken place.?

User Maephisto
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A chemical change is slightly the same as a chemical reaction. Except, the mass in a chemical reaction would be conserved, while in a chemical change, that may not happen. 
User Richardpringle
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 One of the clues are that there will be a change in temperature. Usually when a reaction takes place heat will be absorbed or released resulting in a change of temperature. Hope this helped!
User Jic
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