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15 February, 08:22

Which of the following is a sign a chemical reaction has occurred? A liquid changes to a solid when cooled. A liquid forms bubbles when heated. Two clear liquids combine and mix together. Two clear liquids combine and turn cloudy.

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  1. 15 February, 08:28
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    The best answer is, "Two clear liquids combine and turn cloudy."

    When water freezes form a liquid to a solid. That's a physical change.

    When water boils, it forms bubbles. That's a physical change.

    When you mix ethanol and water, they form a clear solution. That's a physical change.
  2. 15 February, 08:28
    0
    The last one "two clear liquid combine and turn cloudy" shows visual evidence that the two have combined and changed.
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