Part X Chemical Equilibrium

When the temperature increases, what are the effects on K_c value and the equilibrium position of the reversible reaction shown?

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Consider the reversible reaction shown.

At equilibrium, the reaction mixture is found to contain 0.00650 mol of N₂, 0.00350 mol of Cl₂ and 0.850 mol of NCl₃. What is the volume of the container?

• A. 1.07 dm³

• B. 1.15 dm³

• C. 1.32 dm³

• D. 1.74 dm³

Consider the reversible reaction shown.

Which of the following relationships must be correct when the system is at equilibrium?

• A. [X(g)] < [Y(g)]

• B. [X(g)] = 2[Y(g)]

• C. [Z(g)]² = [Y(g)]²

• D. [Z(g)]² > [X(g)][Y(g)]²

Consider the equations shown.

Which of the following correctly shows the relationship between K₁ and K₂?

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Consider the reversible reaction shown.

50.0 cm³ of 0.20 M Fe₂(SO₄)₃(aq) and 50.0 cm³ of 0.20 M KSCN(aq) were mixed at a certain temperature. When equilibrium was reached at this temperature, the system contained 0.042 M SCN^–(aq). What is the K_c for the reaction at this temperature?

• A. 1.68 mol^–1 dm³

• B. 6.33 mol^–1 dm³

• C. 9.73 mol^–1 dm³

• D. 17.2 mol^–1 dm³

Refer to the graph for the reversible reaction shown.

Which of the following changes is done to the system at time t?

• A. The temperature is increased.

• B. HCN(aq) is added to the equilibrium mixture.

• C. NaCN(s) is added to the equilibrium mixture.

• D. Concentrated HCl(aq) is added to the equilibrium mixture.

Sulphur dioxide is allowed to react with oxygen to give sulphur trioxide in a closed container.

Which of the following is the correct concentration-time graph for the reaction?

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P(g) and Q(g) react reversibly to give R(g) in a closed container. The graph shows the changes in concentrations of P(g), Q(g) and R(g) with time.

Which of the following equilibrium constant expressions for the reaction is correct?

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A chemical equilibrium has been established in a closed reaction flask at a certain temperature.

The reaction mixture is then transferred completely to another reaction flask with a tripled volume. Which of the following combinations of Q_c value and the direction of shift of the equilibrium position is correct?

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A certain amount of HI(g) is allowed to decompose in a closed container. An equilibrium is reached after some time.

At time t, some extra HI(g) is added to the system and a new equilibrium will be attained. Which of the following graphs best represents the changes in concentrations of HI(g) and H₂(g)?

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