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3 August, 02:02

We know a chemical reaction has occurred when

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  1. 3 August, 02:29
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    You can tell a chemical reaction has occurred when one of these things happen:

    1) The chemical or substance you're working with changes colors.

    2) Bubbles appear, indicating a gas has formed.

    3) The odor of the substance changes.

    4) The temperature of the chemical changes.
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