Equilibrium - 2

What occurs when a reaction reaches equilibrium?

• The concentration of the reactants increases.

• The concentration of the products increases.

• The rate of the forward reaction is equal to the rate of the reverse reaction.

• The rate of the forward reaction is slower than the rate of the reverse reaction.

A chemical reaction is at equilibrium. Compared to the rate of the forward reaction, the rate of the reverse reaction is

• faster and more reactant is produced

• faster and more product is produced

• the same and the reaction has stopped

• the same and the reaction continues in both directions

In a reversible reaction, chemical equilibrium is attained when the

• concentration of the reactants reaches zero

• concentration of the products remains constant

• rate of the forward reaction is greater than the rate of the reverse reaction

• rate of the reverse reaction is greater than the rate of the forward reaction

Given the equation representing a system at equilibrium:

PCl₅(g) ↔ PCl₃(g) + Cl₂(g).

Which statement describes this system?

• The concentration of PCl₅(g) is increasing.

• The concentration of PCl5(g) is decreasing.

• The concentrations of PCl5(g) and PCl3(g) are equal.

• The concentrations of PCl₅(g) and PCl₃(g) are constant.

Given the equation representing a closed system:

N₂O₄(g) ↔ 2NO₂(g)

Which statement describes this system at equilibrium?

• The volume of the NO₂(g) is less than the volume of the N₂O₄(g).

• The volume of the NO₂(g) is greater than the volume of the N₂O₄(g).

• The rate of the forward reaction and the rate of the reverse reaction are equal.

• The rate of the forward reaction and the rate of the reverse reaction are unequal.