From Mock A · Paper 2: Organic and Physical Chemistry
10.13 marks
Figure 1 shows Maxwell–Boltzmann distributions at two temperatures. Explain why a small rise in temperature leads to a large increase in rate.
Figure 1 (Eₐ marked by the dashed vertical line)
From Mock A · Paper 3: Practical skills, all content and multiple choice
5.15 marks
Explain why the Haber process is run at about 450 °C and 200 atm with an iron catalyst, rather than the conditions that give the highest equilibrium yield.
From Mock A · Paper 3: Practical skills, all content and multiple choice
101 mark
Which change increases the rate constant of a reaction?
From Mock B · Paper 1: Inorganic and Physical Chemistry
5.13 marks
Explain, using the Maxwell–Boltzmann distribution, how a catalyst increases the rate of reaction.
From Mock B · Paper 2: Organic and Physical Chemistry
15.13 marks
Explain why a small increase in temperature causes a large increase in reaction rate.
From Mock B · Paper 3: Practical skills, all content and multiple choice
151 mark
Which change increases the rate of a reaction of a solid with acid without changing the activation energy?
From Mock C · Paper 1: Inorganic and Physical Chemistry
5.13 marks
Sketch (describe) Maxwell–Boltzmann distributions at two temperatures and explain how they show why rate increases with temperature.
From Mock C · Paper 1: Inorganic and Physical Chemistry
5.23 marks
Explain why the rate of reaction between marble chips and hydrochloric acid decreases as the reaction proceeds.
From Mock C · Paper 1: Inorganic and Physical Chemistry
176 marks
Methanol is made industrially: CO(g) + 2H₂(g) ⇌ CH₃OH(g), ΔH = −91 kJ mol⁻¹. Discuss the choice of temperature, pressure and catalyst, referring to yield, rate, feasibility and cost.
From Mock C · Paper 3: Practical skills, all content and multiple choice
141 mark
Activation energy is
Score 0 / 29 · 0 of 10 marked
This paper is written by Plasmo in the style of the AQA A-Level Chemistry exam. It is not a past paper and is not produced or endorsed by the exam board.