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# AP® Chemistry

Free Version
Difficult

APCHEM-G7VZXC

Consider the reaction:

$$CaCO_3(s) ⇄ CaO(s) + CO_2(g)$$

After the equilibrium is established, some pure $CO_2(g)$ is added to the reaction vessel at a constant temperature.

After equilibrium is re-established, which of the following is NOT true from the initial equilibrium to the reestablished equilibrium?

A

$K_p$ remained constant.

B

$K_c$ remained constant.

C

The mass of calcium carbonate increased.

D

The mass of calcium oxide increased.