DP Chemistry (last assessment 2024)

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Question 21N.2.sl.TZ0.b

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Date November 2021 Marks available [Maximum mark: 3] Reference code 21N.2.sl.TZ0.b
Level sl Paper 2 Time zone TZ0
Command term Formulate Question number b Adapted from N/A
b.
[Maximum mark: 3]
21N.2.sl.TZ0.b

Alkanes undergo combustion and substitution.

Formulate equations for the two propagation steps and one termination step in the formation of chloroethane from ethane.

[3]

Markscheme

Cl· + C2H6 → ·C2H5 + HCl ✔

·C2H5 + Cl2 → Cl· + C2H5Cl ✔


·C2H5 + Cl· → C2H5Cl
OR
Cl· + Cl· → Cl2
OR
·C2H5 + ·C2H5 → C4H10 ✔


Do not penalize incorrectly placed radical sign, eg C2H5·.

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