| Date | November 2017 | Marks available | 2 | Reference code | 17N.3.sl.TZ0.15 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Describe | Question number | 15 | Adapted from | N/A |
Question
Vegetable oils can be used as a source of energy.
State the structural feature of chlorophyll that enables it to absorb visible light.
[1]
a.
Vegetable oils are too viscous for use as liquid fuels. Describe, using an equation, how a vegetable oil, such as that shown, is converted to oils with lower viscosity by reaction with methanol, CH3OH.
[2]
b.
Markscheme
«extensive» conjugation
OR
alternating single and double bonds
a.
ester product
glycerol AND correct balancing
Catalyst not required for equation.
Award M2 only if M1 is correct.
b.
Examiners report
[N/A]
a.
[N/A]
b.
