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

Question

CaO + COz = CaСОз
When the reaction is at dynamic equilibrium, which statement must be true?
(1 point)
•The reaction has run out of carbon dioxide or calcium
oxide.
• The concentration of calcium carbonate is increasing.
_ Calcium carbonate and calcium oxide are formed at the same rate.
• The forward and reverse reactions have stopped.

Answer 1

In a system at dynamic equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction. This means that the concentrations of the reactants and products remain constant over time, although they are not necessarily equal.

Based on this understanding, the correct statement from the options provided is:

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

The other statements are not true in a system at dynamic equilibrium:

• The reaction has run out of carbon dioxide or calcium oxide: This is incorrect because at equilibrium, there are still reactants present.
• The concentration of calcium carbonate is increasing: This is also incorrect because at equilibrium, the concentration of all species remains constant.
• The forward and reverse reactions have stopped: This statement is false as well, since the reactions are still occurring; they are just happening at the same rate.

Thus, the correct answer is that calcium carbonate and calcium oxide are formed at the same rate.