DP Chemistry (last assessment 2024)

Test builder »

Question 22M.2.hl.TZ2.6b(i)

Select a Test
Date May 2022 Marks available [Maximum mark: 3] Reference code 22M.2.hl.TZ2.6b(i)
Level hl Paper 2 Time zone TZ2
Command term Sketch Question number b(i) Adapted from N/A
b(i).
[Maximum mark: 3]
22M.2.hl.TZ2.6b(i)

Sulfur trioxide is produced from sulfur dioxide.

2SO2 (g) + O2 (g) ⇌ 2SO3 (g)          ΔH = −196 kJ mol−1

The reaction between sulfur dioxide and oxygen can be carried out at different temperatures.

(b(i))

On the axes, sketch Maxwell–Boltzmann energy distribution curves for the reacting species at two temperatures T1 and T2, where T2 > T1.

[3]

Markscheme

both axes correctly labelled ✔

peak of T2 curve lower AND to the right of T1 curve ✔

lines begin at origin AND correct shape of curves AND T2 must finish above T1 ✔

 

Accept “probability «density» / number of particles / N / fraction” on y-axis.

Accept “kinetic E/KE/Ek” but not just “Energy/E” on x-axis.

Examiners report

Few got the 3 marks for this standard question (average mark 1.7), the most common error being incomplete/incorrect labelling of axes, curves beginning above 0 on y-axis or inverted curves.

Syllabus sections