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24 January, 15:19

Why might it be important in a real life situation, to know if a chemical or physical change occurred?

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  1. 24 January, 15:55
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    There are four signs that a chemical reaction has occurred: a change in color, a change in temperature, formation of a gas or formation of a precipitate. A precipitate is a solid that forms when two liquid solutions are mixed. As matter changes in a chemical reaction, it can either absorb or release energy.
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