Questions:

1) The following reaction is at equilibrium in a closed system:

2SO_2(g) + O_2(g) ⇌ 2SO_3(g)    (-∆H)

Predict the impact of the following changes:

a) pressure is increased

b) some O₂ is added

c) temperature is decreased

2) The following reaction is at equilibrium in a closed system:

PCl_5(g) + heat ⇌ PCl_3(g) + Cl_2(g)    (endo)

Predict the impact of the following changes:

a) volume is increased

b) some PCl₃ is removed

c) system is placed in a hot water bath

3) The graph below represents the following equilibrium system: PCl_5(g) + heat ⇌ PCl_3(g) + Cl_2(g) 

Use the graph to determine what changes have occurred at T₁, T₂ and T₃:

4) The following reaction was at equilibrium in a closed system: N_2(g) + 2O_2(g) ⇌ 2NO_(g)    (+∆H)

Draw a concentration vs time graph that illustrates the following changes:

a) T₁ – the temperature of the system is decreased

b) T₂ – some NO is removed from the system

c) T₃ – the pressure of the system is decreased