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The Ultimate Checkpoint Science Practice Test

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When calcium carbonate reacts with hydrochloric acid, which gas is produced?
Correct Answer:
Carbon Dioxide
Explanation:
A carbonate reacting with an acid releases carbon dioxide. When calcium carbonate meets hydrochloric acid, the carbonate is protonated and breaks down to form calcium chloride, water, and carbon dioxide, which bubbles out as a gas. The balanced idea is CaCO3 + 2 HCl → CaCl2 + CO2 + H2O. So the gas produced is carbon dioxide. Helium, hydrogen, and methane aren’t generated by this acid–carbonate reaction, since they come from different processes and reactants.

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