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Which of the following is a sign a chemical reaction has occurred? A. A solid dissolved in a liquid. B. A solid forms when two liquids are mixed. C. A solid melts to a liquid when it is heated D. A solid
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Which of the following is a sign a chemical reaction has occurred?

A. A solid dissolved in a liquid.
B. A solid forms when two liquids are mixed.
C. A solid melts to a liquid when it is heated
D. A solid metal changes shape

User Sinisa Rudan
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B. A solid forms when two liquids are mixed
User Lars Yencken
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