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20 November, 06:27

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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Answers (2)
  1. 20 November, 07:19
    0
    A piece of metal is placed in water and produces sparks and gas.

    Explanation:

    The atoms and chemical structure of the metal is reacting to the water (s) chemical structure/bond and therefore, producing sparks and gas.
  2. 20 November, 10:11
    0
    A liquid is heated on a hot plate, and bubbles form
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