DP Chemistry (last assessment 2024)

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Question 18N.2.hl.TZ0.b.ii

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.2.hl.TZ0.b.ii
Level hl Paper 2 Time zone TZ0
Command term State Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 1]
18N.2.hl.TZ0.b.ii

3.26 g of iron powder are added to 80.0 cm3 of 0.200 mol dm−3 copper(II) sulfate solution. The following reaction occurs:

Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)

State another assumption you made in (b)(i).

[1]

Markscheme

density «of solution» is 1.00 g cm−3

OR

specific heat capacity «of solution» is 4.18 J g−1 K−1/that of «pure» water

OR

reaction goes to completion

OR

iron/CuSO4 does not react with other substances ✔

 

The mark for “reaction goes to completion” can only be awarded if 0.0160 mol was used in part (b)(i).

Do not accept “heat loss”.

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