In physical science lab, Ben and Jerry added small pieces of magnesium to hydrochloric acid. They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared. What is a sign that a chemical reaction has taken place in this experiment? A) odor B) gas is produced C) magnesium disappeared D) decrease in temperature

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Physics

Cade Lin

5 April, 03:04

In physical science lab, Ben and Jerry added small pieces of magnesium to hydrochloric acid. They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared. What is a sign that a chemical reaction has taken place in this experiment? A) odor B) gas is produced C) magnesium disappeared D) decrease in temperature

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Misha · Answer 1

B) gas is produced.

a) is wrong because hydrogen is an odorless gas. c) is wrong because when compounds disappear, its not necessarily because of a chemical reaction e. g. when sugar dissolves in water no chemical reaction takes place. d) is wrong because there is an increase in temperature.