CART Equilibrium and Reaction Rates 1

Question 1

At chemical equilibrium, which of the following is true?

Accepted Answer

The forward and reverse reaction rates are equal

Answer

At equilibrium, the forward and reverse reactions occur at the same rate, so concentrations remain constant but are not necessarily equal.

Question 2

For the reaction: N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the equilibrium constant expression Kc is:

Accepted Answer

[NH₃]² / ([N₂][H₂]³)

Answer

Kc = [products]^coefficients / [reactants]^coefficients = [NH₃]² / ([N₂][H₂]³).

Question 3

If Kc >> 1 for a reaction, the equilibrium mixture contains mostly:

Accepted Answer

Products

Answer

A large Kc value means the equilibrium lies far to the right, favoring product formation.

Question 4

According to Le Chatelier's Principle, increasing the pressure on a gas-phase equilibrium will shift the reaction toward:

Accepted Answer

The side with fewer moles of gas

Answer

Le Chatelier's Principle states that increased pressure shifts the equilibrium toward the side with fewer moles of gas to relieve the stress.

Question 5

Adding a catalyst to a reaction at equilibrium will:

Accepted Answer

Not change the equilibrium position but speed up reaching it

Answer

A catalyst lowers activation energy for both forward and reverse reactions equally, allowing equilibrium to be reached faster without changing Kc or position.

CART - Chemistry Acceleration Readiness Test Practice Test

CART - Chemistry Acceleration Readiness Test Practice Test

CART Equilibrium and Reaction Rates 1