Calcium oxide and carbon dioxide combine to form calcium carbonate in the reversible reaction:

Question

CaO + CO2 ⇌ CaCO3

When the reaction is at dynamic equilibrium, which statement must be true?

(1 point)
Responses

The concentration of calcium carbonate is increasing.
The concentration of calcium carbonate is increasing.

The forward and reverse reactions have stopped.
The forward and reverse reactions have stopped.

The reaction has run out of carbon dioxide or calcium oxide.
The reaction has run out of carbon dioxide or calcium oxide.

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

Answer 1

At dynamic equilibrium in a reversible reaction, the rate of the forward reaction is equal to the rate of the reverse reaction. This means that while reactions are still occurring, the concentrations of the reactants and products remain constant over time.

Therefore, the correct statement in this context is:

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

This statement reflects the balance between the forward reaction (CaO + CO2 → CaCO3) and the reverse reaction (CaCO3 ⇌ CaO + CO2).