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Emily Allen——Studied at University of California, Berkeley, Lives in Berkeley, CA
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.read more >>+119962023-04-27 15:38:08
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