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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.

Syllabus sections

Options » C: Energy » C.4 Solar energy
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