Question

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carbonic acid forms when gas dissolves in and combines with molecules.
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Explanation:

Carbonic acid ($H_2CO_3$) is formed through a chemical reaction. Carbon dioxide ($CO_2$) gas is soluble in water ($H_2O$). When $CO_2$ dissolves in water, it reacts with water molecules. The chemical equation for the formation of carbonic acid is $CO_2 + H_2O
ightleftharpoons H_2CO_3$.

Answer:

Carbonic acid forms when carbon dioxide gas dissolves in water and combines with water molecules.