DP Chemistry (last assessment 2024)
Question 18N.3.hl.TZ0.b.ii
| Date | November 2018 | Marks available | [Maximum mark: 1] | Reference code | 18N.3.hl.TZ0.b.ii |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | Describe | Question number | b.ii | Adapted from | N/A |
b.ii.
[Maximum mark: 1]
18N.3.hl.TZ0.b.ii
Solar energy, which is freely available, is indispensable to life on earth.
Describe how vegetable oils can be converted to a more suitable fuel.
[1]
Markscheme
convert to esters of monoatomic alcohols
OR
react with short-chain alcohols «in the presence of acid or base» ✔
Accept “convert to shorter «carbon chain» esters” OR “transesterification”.
Accept specific alcohols, such as methanol or ethanol.
