DP Chemistry (last assessment 2024)

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Question 18N.2.sl.TZ0.c.iii

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.2.sl.TZ0.c.iii
Level sl Paper 2 Time zone TZ0
Command term Explain Question number c.iii Adapted from N/A
c.iii.
[Maximum mark: 2]
18N.2.sl.TZ0.c.iii

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)

Explain, using the collision theory, why replacing the iron powder with a piece of iron of the same mass slows down the rate of the reaction.

[2]

Markscheme

piece has smaller surface area ✔

 

lower frequency of collisions

OR

fewer collisions per second/unit time ✔

 

Accept “chance/probability” instead of “frequency”.

Do not accept just “fewer collisions”.

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