DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ2.a(i)

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

Standard electrode potential values, E⦵, can be used to predict spontaneity.

Iron(II) is oxidized by bromine.

2Fe2+ (aq) + Br2 (l) ⇌ 2Fe3+ (aq) + 2Br− (aq)

Calculate the E⦵cell, in V, for the reaction using section 24 of the data booklet.

[1]

Markscheme

«E⦵cell = 1.09 – 0.77 =» 0.32 «V» ✔

Examiners report

Only 50% got this straightforward calculation right, the most common error being to multiply both E0 values by 2, reflecting a lack of practice with this type of exercises.

Syllabus sections