Worksheet: Pressure Changes in Equilibria

In this worksheet, we will practice predicting the effect of pressure on a reversible reaction by comparing molar amounts of reactant and product gases.

Q1:

The following reaction is the basis of a very well-known industrial process. N()+3H()2NH()223ggg

Nitrogen and hydrogen are mixed and a dynamic equilibrium is established.

Which gas, or gases, will be present in the reaction vessel at equilibrium?

  • ANitrogen, hydrogen, and ammonia
  • BNitrogen, hydrogen, ammonia, and steam
  • CNitrogen and hydrogen
  • DHydrogen and ammonia
  • EAmmonia

Q2:

Five students are asked to write the definition of dynamic equilibrium. Which student has not fully understood the concept?

  • AA dynamic equilibrium is a reversible reaction that stops when the amount of each substance is stable.
  • BA dynamic equilibrium is a reversible reaction where the concentration of each substance does not change.
  • CA dynamic equilibrium is a reaction where the speed of the forward reaction equals the speed of the backward reaction.
  • DA dynamic equilibrium is a reaction that goes in both directions, where the amount of each substance does not change.
  • EA dynamic equilibrium is a forward and backward reaction that occurs at the same time with the same rate.

Q3:

If a reversible reaction is allowed to reach equilibrium in a closed system, which of the following statements is true?

  • AAdding more reactant does not affect the equilibrium.
  • BThe concentration of the reactants does not change.
  • CThe rate of the forward reaction is slower than the rate of the backward reaction.
  • DRemoving some of the product does not affect the equilibrium.
  • EThe concentration of the reactants and the products is the same.

Q4:

If a reversible reaction is allowed to reach equilibrium in a closed system, which of the following will be true?

  • AThe concentration of the reactants and the products will be the same.
  • BIncreasing the temperature will not affect the equilibrium.
  • CThe concentration of the products will gradually increase.
  • DThe rate of the forward reaction will be the same as the rate of the backward reaction.
  • EIncreasing the pressure inside the closed system will not affect the equilibrium.

Q5:

A dynamic equilibrium is established between two reactants A and B according to the equation shown. A()2B()aqaq

Solution A has an initial concentration of 0.8 mol/dm3 that drops to 0.4 mol/dm3 once equilibrium is established.

Which graph for this equilibrium is correct?

  • A
  • B
  • C
  • D

Q6:

What effect does using a catalyst have on the amount of ammonia produced in the given reaction? N()+3H()2NH()223ggg

  • AThe amount of ammonia produced will be the same.
  • BThe amount of ammonia produced will be more.
  • CThe amount of ammonia produced will be less.

Q7:

Which of the following will never affect the position of an equilibrium?

  • AThe temperature
  • BA catalyst
  • CThe concentration of reactants
  • DThe pressure
  • EThe concentration of products

Q8:

Which of the following statements concerning concentrations is always true at equilibrium?

  • AThe concentrations of the products are greater than the reactants.
  • BThe concentrations of reacting substances do not change.
  • CThe concentrations of the reactants and products are constantly changing.
  • DThe concentrations of reacting substances are equal.
  • EThe concentrations of the reactants are decreasing.

Q9:

Which of the following statements is true of a reversible reaction at dynamic equilibrium?

  • AThe rate of the forward reaction is less than the rate of the backward reaction.
  • BThe rate of the forward reaction is equal to the rate of the backward reaction.
  • CThe rate of the backward reaction is less than the rate of the forward reaction.
  • DThe concentration of the products is increasing.
  • EThe concentration of reactants is decreasing.

Q10:

Which of the following lines depicts the points at which dynamic equilibrium is established?

  • AA
  • BC
  • CB
  • DD

Q11:

Put these steps in the correct order to describe the creation of a dynamic equilibrium.

  • AT, P, R, S, Q
  • BT, P, S, R, Q
  • CP, T, S, R, Q
  • DP, T, R, S, Q
  • ET, P, S, Q, R

Q12:

Two chemicals SO2 and O2, vital to the contact process, are mixed and equilibrium is established. Which statement does not describe the conditions of or a part of that process? 2SO()+O()2SO()223ggg

  • AThe rate of the backward reaction increases as the concentration of SO()3g increases.
  • BThe concentrations of SO()2g and O()2g eventually reach zero.
  • CA closed system is needed.
  • DThe rate of the forward reaction equals the rate of the backward reaction at equilibrium.
  • EInitially, the rate of the forward reaction starts to decrease as the concentrations of SO()2g and O()2g decrease.

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