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How do you know when a chemical reaction has taken place?
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How do you know when a chemical reaction has taken place?

User Katherinne
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Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.
User LedgeJumper
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When the color or compound has completely changed into something different

User Kitra
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