Equilibrium constant Kp for homogeneous systems (A-level only) exam tips

Exam tips

• Always show your workings in calculations

  When calculating partial pressures, clearly show the formula used, the values substituted, and the final answer with units.

  This not only helps in gaining marks for method but also ensures clarity in your reasoning.

• Show all steps in calculations

  When calculating partial pressures or mole fractions, clearly show each step of your calculation.

  This not only helps in avoiding mistakes but also allows you to gain partial credit if your final answer is incorrect.

• Check units when calculating Kp

  Ensure that all partial pressures are in the same units (typically atm) before calculating Kp.

  Using consistent units is crucial for obtaining an accurate value for Kp and avoiding errors in calculations.

• Check Units

  When calculating Kp, always check the units of the partial pressures to ensure they are consistent.

  This helps avoid mistakes in calculations and ensures that the final answer is expressed correctly.

• Check units when calculating Kp

  Ensure that all partial pressures are in the same units (typically atm) before substituting into the Kp expression.

  Inconsistent units can lead to incorrect calculations and interpretations of Kp.