How do we know that a chemical reaction takes place?
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1
Answer:
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.
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Answered by
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Answer:
we know that a chemical reaction takes place when any of the following are observed in the process:
(1)change in color
(2)change in state
(3)evolution of gas
(4)change in temperature
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