Question

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

Answer 1

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How can I tell if a chemical reaction is occurring? A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change

Answer 2

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A chemical reaction is usually accompanied/observed by easily observing physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change, changes in temperature etc.