DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ2.c(ii)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.hl.TZ2.c(ii) |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Identify | Question number | c(ii) | Adapted from | N/A |
c(ii).
[Maximum mark: 1]
19M.3.hl.TZ2.c(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.
Identify one error associated with the use of an accurate stopwatch.
[1]
Markscheme
human reaction time/delay «starting/stopping the stopwatch» [✔]
Examiners report
This part was well answered by most candidates although some candidates did not read the question clearly and commented on the stopwatch not working properly or not being accurate.
