Reaction Quotients

Equilibrium • Chemistry

Set 5 — Mastery

For the reaction $A + B \rightleftharpoons C + D$ , the reaction quotient $Q_c$ is defined as what?

$\frac{[C][D]}{[A][B]}$

If $Q_c < K_c$ for a reaction at a given temperature, what will happen?

The reaction will shift to the right.

The reaction will shift to the left.

In the equilibrium expression for the reaction $2A + B \rightleftharpoons 3C$ , which of the following is correct?

$Q_c = \frac{[C]^{3}}{[A]^{2}[B]}$

For the reaction $N_{2}(g) + 3H_{2}(g) \rightleftharpoons 2NH_{3}(g)$ , what is the expression for ?

If the reaction $P \rightleftharpoons Q$ has $Q_c = 0.5$ and $K_c = 1.0$ , what can be said about the reaction?

What happens to $Q_c$ if the concentration of a reactant is increased?

$Q_c$ increases.

decreases.

For a reaction $aA + bB \rightleftharpoons cC + dD$ , how is $Q_c$ calculated?

What is the significance of the reaction quotient $Q$ in chemical reactions?

It indicates the direction of the reaction.

It determines the temperature of the reaction.

It measures the rate of the reaction.

It defines the equilibrium constant.

In a reaction where $Q > K$ , what is the expected shift in equilibrium?

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\frac{[A] [B]}{[C] [D]}

\frac{[A][B]}{[C][D]}