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Reaction Quotients

This worksheet covers Reaction Quotients, which is part of the Equilibrium module in the Chemistry course. Practice problems are designed to strengthen key concepts and build confidence.

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Reaction Quotients

Equilibrium • Chemistry

Set 2 — Foundation

What is the reaction quotient $Q$ for the reaction $aA + bB \rightleftharpoons cC + dD$ ?

$Q = \frac{[C]^c[D]^d}{[A]^a[B]^b}$

$Q = \frac{[A]^a[B]^b}{[C]^c[D]^d}$

$Q = [C]^c + [D]^d$

$Q = [A]^a + [B]^b$

If for the reaction $2H_{2} + O_{2} \rightleftharpoons 2H_{2}O$ , the concentrations are $[H_{2}] = 0.5 \, M$ , $[O_{2}] = 0.25 \, M$ , and $[H_{2}O] = 1.0 \, M$ , what is $Q$ ?

$Q = 4$

$Q = 1$

$Q = 2$

$Q = 0.5$

For the reaction $N_{2} + 3H_{2} \rightleftharpoons 2NH_{3}$ , if $Q = 0.5$ , which direction will the reaction shift?

To the right

To the left

No shift

Cannot determine

What does it mean if $Q = K$ for a reaction at equilibrium?

The reaction is spontaneous

The reaction is at equilibrium

The reactants are favored

The products are favored

For the equilibrium reaction $A \rightleftharpoons B$ , if $[A] = 0.2 \, M$ and $[B] = 0.8 \, M$ , what is $Q$ ?

$Q = 4$

$Q = 0.25$

$Q = 1$

$Q = 0.5$

What is the effect of increasing the concentration of reactants on the reaction quotient $Q$ ?

Increases $Q$

Decreases $Q$

No effect on $Q$

Depends on the reaction

For the reaction $C \rightleftharpoons 2D$ , if $Q = 3$ and $K = 2$ , what will happen to the system?

Shift to the right

Shift to the left

Remain at equilibrium

Cannot determine

If the reaction $2SO_{2} + O_{2} \rightleftharpoons 2SO_{3}$ reaches equilibrium with $K = 25$ , what does this indicate about the products?

Products are favored

Reactants are favored

Equal amounts of products and reactants

No information about products

In the reaction $2A \rightleftharpoons B + C$ , if $[A]$ decreases, how will $Q$ change?

Increase

Decrease

Stay the same

Not enough information

10.

For the reaction $P \rightleftharpoons Q$ , if $[P] = 0.1 \, M$ and $[Q] = 0.5 \, M$ , calculate $Q$ .

$Q = 5$

$Q = 0.2$

$Q = 3$

$Q = 0.5$

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