The reaction between calcium oxide and carbon dioxide is reversible, and the forward reaction gives out heat. $\text{CaO}(s) + \text{CO}_2(g) \rightleftharpoons \text{CaCO}_3(s)$ Calcium oxide and carbon dioxide are put into a heated flask, and the reaction attains equilibrium. Which statement about this equilibrium is correct?
- ALess calcium carbonate is produced if the pressure in the flask increases.
- BMore calcium carbonate is produced when the temperature is increased.
- CThe flask must be sealed if equilibrium is to be reached.
- DWhen equilibrium is reached, the reaction stops.