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6 July, 21:31

When a strip of zinc metal is added to a test tube of hydrochloric acid, the liquid forms bubbles, and the test tube feels hot. The bubbles are a result of the formation of hydrogen gas. What does the hot test tube indicate? A. The reaction releases heat. B. Hydrogen gas absorbs heat. C. The reaction absorbs heat. D. A chemical change has been reversed.

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  1. 7 July, 00:00
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    A

    Explanation:

    When a strip of zinc metal is added to a test tube of hydrochloric acid, the liquid forms bubbles, and the test tube feels hot. The bubbles are a result of the formation of hydrogen gas.

    Then the reaction releases heat.
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