DP Chemistry (last assessment 2024)

Test builder »

Question 22M.2.sl.TZ2.b(iii)

Select a Test
Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.sl.TZ2.b(iii)
Level sl Paper 2 Time zone TZ2
Command term Suggest Question number b(iii) Adapted from N/A
b(iii).
[Maximum mark: 1]
22M.2.sl.TZ2.b(iii)

Lithium reacts with water to form an alkaline solution.

A 0.200 g piece of lithium was placed in 500.0 cm3 of water.

Suggest a reason why the volume of hydrogen gas collected was smaller than predicted.

[1]

Markscheme

lithium was impure/«partially» oxidized

OR

gas leaked/ignited ✔

 

Accept “gas dissolved”.

Examiners report

This part-question was better answered than part (ii). 50% of the candidates drew a correct arrow between n=2 and n=3. Both absorption and emission transitions were accepted since the question did not specify which type of spectrum was required. Some teachers commented on this in their feedback. Mistakes often included transitions between higher energy levels.

Syllabus sections