DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ2.f
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.sl.TZ2.f |
| Level | sl | Paper | 3 | Time zone | TZ2 |
| Command term | Explain | Question number | f | Adapted from | N/A |
f.
[Maximum mark: 2]
18M.3.sl.TZ2.f
Lipids provide energy and are an important part of a balanced diet.
Explain why lipids provide more energy than carbohydrates and proteins.
[2]
Markscheme
ratio of oxygen to carbon in lipids lower
OR
lipids less oxidized
OR
lipids more reduced
more energy per mass/g released when lipids are oxidized
Accept “«average» oxidation number of carbon in linoleic acid is lower” for M1.
[2 marks]
