DP Chemistry (last assessment 2024)

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

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.hl.TZ2.6d(i)
Level hl Paper 2 Time zone TZ2
Command term State Question number d(i) Adapted from N/A
d(i).
[Maximum mark: 1]
22M.2.hl.TZ2.6d(i)

Sulfur trioxide is produced from sulfur dioxide.

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

(d(i))

State the product formed from the reaction of SO3 with water.

[1]

Markscheme

sulfuric acid/H2SO4 ✔


Accept “disulfuric acid/H2S2O7”.

Examiners report

6(d)(i)-(ii): These simple questions could be expected to be answered by all HL candidates. However 20% of the candidates suggested hydroxides or hydrogen as products of an aqueous dissolution of sulphur oxide. In the case of the definition of a strong Brønsted-Lowry acid, only 50% got both marks, often failing to define "strong" but in other cases defining them as bases even.

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