DP Chemistry (last assessment 2024)
Question 19M.2.sl.TZ2.d(ii)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.sl.TZ2.d(ii) |
| Level | sl | Paper | 2 | Time zone | TZ2 |
| Command term | Deduce | Question number | d(ii) | Adapted from | N/A |
d(ii).
[Maximum mark: 1]
19M.2.sl.TZ2.d(ii)
Ethyne, C2H2, reacts with oxygen in welding torches.
Product B, CH3CHO, can also be synthesized from ethanol.
Deduce the average oxidation state of carbon in product B.
[1]
Markscheme
–1 [✔]
Examiners report
About 60 % of the candidates determined the average oxidation state of carbon in ethanal. A couple of teachers commented that asking SL students to determine an “average oxidation state” seems a little difficult. Please note that this term has been used in recent papers whenever there are two or more atoms of the element in different parts of the compound. There was no evidence of confusion on the part of the candidates and most answered the question well.
