CART Equilibrium and Reaction Rates

Question 1

At chemical equilibrium, which of the following is true?

Accepted Answer

The forward and reverse reaction rates are equal

Answer

The reaction has stopped completely

Answer

The concentrations of reactants and products are equal

Answer

All reactants have been consumed

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

[N₂][H₂]³ / [NH₃]²

Answer

[NH₃] / ([N₂][H₂])

Answer

[NH₃]² / [H₂]³

Question 3

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

Accepted Answer

Products

Answer

Reactants

Answer

Equal amounts of both

Answer

Only catalysts

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

The side with more moles of gas

Answer

The endothermic side

Answer

The exothermic side

Question 5

Adding a catalyst to a reaction at equilibrium will:

Accepted Answer

Not change the equilibrium position but speed up reaching it

Answer

Shift the equilibrium toward products

Answer

Shift the equilibrium toward reactants

Answer

Increase the value of Kc

Question 6

Which factor does NOT affect the value of the equilibrium constant Kc?

Accepted Answer

Concentration of reactants

Answer

Temperature

Answer

Pressure (for some reactions)

Answer

Nature of the reaction