AQA A Level Kp: Partial Pressures Lesson

Complete 55-minute AQA A Level Chemistry lesson on mole fractions and partial pressures (3.1.10): teacher and pupil slides, worksheet and full answers.

Lesson 1 of an eight-lesson sequence on the equilibrium constant Kp. Pupils learn to calculate the mole fraction of a gas from amounts in moles, then the partial pressure as mole fraction × total pressure, checking that the partial pressures add up to the total.

How it runs: a ten-minute Do Now recalling AS moles and equilibrium; a hook on why climbers need oxygen on Everest, with a graph of air pressure against altitude; two short teaching cycles, each with a worked model, a gap-fill, a hinge question with every wrong answer diagnosed in the notes, a completion problem, mini-whiteboard practice and a timed independent task; a six-question Progress Check; an exam tip.

What’s included: a teacher PowerPoint with answers revealed on click and full speaker notes (timings, what to look for, what each wrong answer means); a pupil PowerPoint with the answers removed; a printable worksheet; a full answer document; and optional independent-study practice with answers. Everything is editable, set in Century Gothic, and every calculation is worked one step to a line.

Specification: AQA A Level Chemistry 7405, 3.1.10 Equilibrium constant Kp for homogeneous systems (A level only). Built for 55-minute lessons; adaptable to other boards that teach Kp.