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Question 19M.2.sl.TZ1.4b(ii)

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.sl.TZ1.4b(ii)
Level sl Paper 2 Time zone TZ1
Command term Sketch Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 2]
19M.2.sl.TZ1.4b(ii)

This question is about peroxides.

Hydrogen peroxide decomposes to water and oxygen when a catalyst such as potassium iodide, KI, is added.

2H2O2 (aq)  → KI (aq) O2 (g) + 2H2O (l)

(b(ii))

Additional experiments were carried out at an elevated temperature. On the axes below, sketch Maxwell–Boltzmann energy distribution curves at two temperatures T1 and T2, where T2 > T1.

[2]

Markscheme

peak of T2 to right of AND lower than T1  [✔]

lines begin at origin AND T2 must finish above T1  [✔]

Examiners report

The drawing of the two curves at T1 and T2 was generally poorly done.

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