DP Chemistry (last assessment 2024)

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Question 17N.3.sl.TZ0.15

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Date November 2017 Marks available [Maximum mark: 3] Reference code 17N.3.sl.TZ0.15
Level sl Paper 3 Time zone TZ0
Command term Describe, State Question number 15 Adapted from N/A
15.
[Maximum mark: 3]
17N.3.sl.TZ0.15

Vegetable oils can be used as a source of energy.

(a)

State the structural feature of chlorophyll that enables it to absorb visible light.

[1]

Markscheme

«extensive» conjugation

OR

alternating single and double bonds

(b)

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]

Markscheme

ester product

glycerol AND correct balancing

Catalyst not required for equation.

Award M2 only if M1 is correct.

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