Take this Quiz: A-Level Chemistry: Equilibria | Zestly

Question 1

In a closed system, a reaction reaches dynamic equilibrium. Which of the following statements correctly describes the state of the system?

Accepted Answer

The rate of the forward reaction equals the rate of the reverse reaction.

Question 2

Consider the equilibrium: N2(g) + 3H2(g) ⇌ 2NH3(g). The forward reaction is exothermic. Which of the following actions will increase the yield of NH3 at equilibrium?

Accepted Answer

Increasing the total pressure of the system.

Question 3

For the reaction A(g) + B(g) ⇌ 2C(g), the equilibrium concentrations are [A] = 0.50 mol/dm3, [B] = 0.20 mol/dm3, and [C] = 0.40 mol/dm3. What is the value of Kc?

Accepted Answer

1.60

Question 4

Which of the following factors will change the numerical value of the equilibrium constant Kc?

Answer

Adding a catalyst.

Answer

Changing the temperature.

Answer

Increasing the pressure.

Answer

Changing the concentration of a reactant.

Question 5

For the reaction X(g) + Y(g) ⇌ Z(g), the total pressure is 2.0 atm. At equilibrium, the mole fractions are X = 0.2, Y = 0.3, and Z = 0.5. What is the partial pressure of Z?

Answer

0.5 atm

Answer

1.0 atm

Answer

1.5 atm

Answer

2.0 atm