1.1. This question is about reversible reactions.

The decomposition of hydrogen iodide into hydrogen and iodine is reversible.

2HI (g) $\rightleftharpoons$ H₂ (g) + I₂ (g)

The forward reaction is endothermic. 

Explain the effect of increasing temperature on the amount of hydrogen iodide, HI. 

1.2. Explain what effect, if any, increasing the pressure will have on the amount of hydrogen iodide at equilibrium.

1.3. An endothermic reaction can be represented using the following reaction profile in Figure 1. 

Label 

• Activation energy 

• Overall energy change 

Figure 1

1.4. How does the diagram show that the reaction is endothermic?