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Chemistry, 10.11.2020 23:00 stopithelpmeplease

What is a sign that a chemical change has happened? O A. A substance dissolves.
O B. Sound and heat are produced.
OC. A substance changes temperature.
O D. A change of state happens.

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What is a sign that a chemical change has happened? O A. A substance dissolves.
O B. Sound an...

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