DP Chemistry (last assessment 2024)

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Question 19M.3.sl.TZ2.2c(ii)

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.sl.TZ2.2c(ii)
Level sl Paper 3 Time zone TZ2
Command term Identify Question number c(ii) Adapted from N/A
c(ii).
[Maximum mark: 1]
19M.3.sl.TZ2.2c(ii)

Bromine and methanoic acid react in aqueous solution.

Br2 (aq) + HCOOH (aq) → 2Br− (aq) + 2H+ (aq) + CO2 (g)

The reaction was monitored by measuring the volume of carbon dioxide produced as time progressed.

(c(ii))

Identify one error associated with the use of an accurate stopwatch.

[1]

Markscheme

human reaction time/delay «starting/stopping the stopwatch»  [✔]

Note: Do not accept “inaccurate stopwatch”.

Examiners report

This question was well answered by most candidates although some students did not read the question clearly and commented on the stopwatch having problems or not being accurate.

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