DP Chemistry (last assessment 2024)
Question 21M.2.sl.TZ1.5
| Date | May 2021 | Marks available | [Maximum mark: 5] | Reference code | 21M.2.sl.TZ1.5 |
| Level | sl | Paper | 2 | Time zone | TZ1 |
| Command term | Deduce, Justify, State, Suggest | Question number | 5 | Adapted from | N/A |
5.
[Maximum mark: 5]
21M.2.sl.TZ1.5
Ethanol is obtained by the hydration of ethene, C2H4.
(a(i))
State the class of compound to which ethene belongs.
[1]
Markscheme
alkene ✔
(a(ii))
State the molecular formula of the next member of the homologous series to which ethene belongs.
[1]
Markscheme
C3H6 ✔
Accept structural formula.
(b)
Justify why ethene has only a single signal in its 1H NMR spectrum.
[1]
Markscheme
hydrogen atoms/protons in same chemical environment ✔
Accept “all H atoms/protons are equivalent”.
Accept “symmetrical”
(c)
Suggest two possible products of the incomplete combustion of ethene that would not be formed by complete combustion.
[1]
Markscheme
carbon monoxide/CO AND carbon/C/soot ✔
(d)
A white solid was formed when ethene was subjected to high pressure.
Deduce the type of reaction that occurred.
[1]
Markscheme
«addition» polymerization ✔