Question

calcium oxide and carbon dioxide combine to form calcium carbonate in the reversible reaction: cao + co₂ ⇌ caco₃. when the reaction is at dynamic equilibrium, which statement must be true? (1 point) calcium carbonate and calcium oxide are formed at the same rate. the reaction has run out of carbon dioxide or calcium oxide. the concentration of calcium carbonate is increasing. the forward and reverse reactions have stopped.

Explanation:

At dynamic equilibrium in a reversible reaction, the rate of the forward reaction equals the rate of the reverse reaction. For the reaction $\mathrm{CaO}+\mathrm{CO}_2
ightleftharpoons\mathrm{CaCO}_3$, calcium carbonate is formed in the forward reaction and calcium oxide (along with carbon - dioxide) is formed in the reverse reaction. When at equilibrium, these two processes occur at the same rate. The reaction does not run out of reactants as it is in a continuous state of reaction. The concentration of products and reactants remains constant at equilibrium, so the concentration of calcium carbonate is not increasing, and the forward and reverse reactions do not stop.

Answer:

Calcium carbonate and calcium oxide are formed at the same rate.