(i) curve with a higher peak AND displaced to the left «lower energy» AND lying below the 800 K curve at high kinetic energy, starting at the origin and not crossing the x-axis ✔

(ii) $E_\mathrm{a}$ marked as a vertical line / a point on the kinetic energy axis to the right of both peaks ✔

(iii) «at the lower temperature» the area under the curve to the right of $E_\mathrm{a}$ is smaller ✔

fewer particles / a smaller proportion of particles have $E \geq E_\mathrm{a}$ «so fewer collisions are successful per unit time» ✔

(iv) shifts left / towards cyclohexane AND there are more moles / molecules of gas on the product side «4 compared with 1» ✔

(v) «forward» reaction is endothermic AND the position shifts left / towards the reactants «the exothermic reverse reaction is favoured» ✔

(i) [1]; do not award the mark if the new curve crosses the x-axis or rises above the 800 K curve at high energy. (ii) [1]; accept a correct label on the x-axis or on a drawn vertical line. (iii) M1: reference to the area under the curve beyond Ea; M2: fewer particles with energy at or above Ea. (iv) [1] for the direction with the reason. (v) [1] for the direction linked to the endothermic forward reaction; accept 'the exothermic reverse reaction is favoured'.