Question

11 6 At room temperature and pressure, the brown gas, \( \mathrm{NO}_{2} \), contains some di-nitrogen dioxide, \( \mathrm{N}_{2} \mathrm{O}_{4} \). The two substances are in a dynamic equilibrium. \[ \mathrm{N}_{2} \mathrm{O}_{4}(\mathrm{~g}) \rightleftarrows 2 \mathrm{NO}_{2}(\mathrm{~g}) \quad \Delta H=+58 \mathrm{KJ} \] (a) What is meant by dynamic equilibrium? \( \qquad \) \( \qquad \) [1] (b) One of the lines on the graph below shows how the amount of \( \mathrm{NO}_{2} \) in the equilibrium mixture varies with pressure. Which line, \( \mathrm{X} \) or \( \mathrm{Y} \), correctly shows how the percentage of \( \mathrm{NO}_{2} \) in the equilibrium mixture changes as the pressure is increased if the temperature stays constant? \( \qquad \) Explain the choice of your answer. \( \qquad \) [2] (c) The energy change, \( \Delta H \), given is for the forward reaction. On the axis, complete the diagram by drawing a labelled energy level diagram to show the progress of the reaction for the production of nitrogen dioxide, \( \mathrm{NO}_{2} \). (d) What will be the effect, on the percentage of the nitrogen dioxide, of increasing the temperature of the equilibrium mixture at constant pressure?

          11
6 At room temperature and pressure, the brown gas, \( \mathrm{NO}_{2} \), contains some di-nitrogen dioxide, \( \mathrm{N}_{2} \mathrm{O}_{4} \). The two substances are in a dynamic equilibrium.
\[
\mathrm{N}_{2} \mathrm{O}_{4}(\mathrm{~g}) \rightleftarrows 2 \mathrm{NO}_{2}(\mathrm{~g}) \quad \Delta H=+58 \mathrm{KJ}
\]
(a) What is meant by dynamic equilibrium?
\( \qquad \)
\( \qquad \)
[1]
(b) One of the lines on the graph below shows how the amount of \( \mathrm{NO}_{2} \) in the equilibrium mixture varies with pressure.
Which line, \( \mathrm{X} \) or \( \mathrm{Y} \), correctly shows how the percentage of \( \mathrm{NO}_{2} \) in the equilibrium mixture changes as the pressure is increased if the temperature stays constant? \( \qquad \) Explain the choice of your answer.
\( \qquad \)
[2]
(c) The energy change, \( \Delta H \), given is for the forward reaction. On the axis, complete the diagram by drawing a labelled energy level diagram to show the progress of the reaction for the production of nitrogen dioxide, \( \mathrm{NO}_{2} \).
(d) What will be the effect, on the percentage of the nitrogen dioxide, of increasing the temperature of the equilibrium mixture at constant pressure?

11
6 At room temperature and pressure, the brown gas, NO2, contains some di-nitrogen dioxide, N2O4. The two substances are in a dynamic equilibrium.

N2O4( g) ⇄ 2 NO2( g) Δ H=+58 KJ

(a) What is meant by dynamic equilibrium?

[1]
(b) One of the lines on the graph below shows how the amount of NO2 in the equilibrium mixture varies with pressure.
Which line, X or Y, correctly shows how the percentage of NO2 in the equilibrium mixture changes as the pressure is increased if the temperature stays constant? Explain the choice of your answer.

[2]
(c) The energy change, Δ H, given is for the forward reaction. On the axis, complete the diagram by drawing a labelled energy level diagram to show the progress of the reaction for the production of nitrogen dioxide, NO2.
(d) What will be the effect, on the percentage of the nitrogen dioxide, of increasing the temperature of the equilibrium mixture at constant pressure?

Added by Olivia D.

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