The most authoritative answer in 2024
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Zoe Martin——Studied at the University of Sydney, Lives in Sydney, Australia.
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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