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Chemistry, 28.05.2020 15:00 jchavez0790

Which of the following is a sign a chemical reaction has occurred?
A blue liquid is mixed into a yellow liquid, and the mixture turns green.
A piece of metal is placed in water and produces sparks and gas.
Aliquid is heated on a hotplate, and bubbles form.
A solid powder is mixed into a liquid and disappears.

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Which of the following is a sign a chemical reaction has occurred?
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