Practice Chemical Equilibrium in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

A dynamic state in a reversible reaction where the forward and reverse reactions proceed at equal rates, so the macroscopic concentrations of reactants and products remain constant over time, even though molecular-level reactions continue.

The reaction is still happening both ways, but the amounts stay constant.

Example 1

easy
Explain what it means for a reaction to be at chemical equilibrium.

Example 2

medium
For the reaction \text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3, at equilibrium [\text{N}_2] = 0.50\,\text{M}, [\text{H}_2] = 1.50\,\text{M}, and [\text{NH}_3] = 0.60\,\text{M}. Calculate K_{eq}.

Example 3

medium
For \text{N}_2\text{O}_4 \rightleftharpoons 2\text{NO}_2, if additional \text{N}_2\text{O}_4 is added, which direction does the equilibrium shift? Apply Le Chatelier's principle.

Example 4

medium
At equilibrium in a reversible reaction, have the reactions stopped? Explain what is equal at equilibrium.
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