Equilibrium - Exam Tips

Seite 1

What to include in a question. (In terms of temperature and pressure).

Kp is only affected by a change in temperature.

If Kp increases, the forwards reaction is favoured.

Exothermic reactions are favoured by a decrease in temperature.

Pressure and concentrations affect yield.

Increasing the pressure increases the rate.

Increasing pressure favours side with fewest moles of gas.

Endothermic reactions favoured by an increase in temperature.

Watch out for this question: Suggest why the chemist is more concerned with increasing the proportion of H2 that reacts rather than the proportion of N2 that reacts.

This is because N2 is obtained from the air and H2 must be manufactured.

Both marks were required for this.