DP Chemistry (last assessment 2024)

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Question 19M.1.sl.TZ2.14

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.sl.TZ2.14
Level sl Paper 1 Time zone TZ2
Command term Question number 14 Adapted from N/A
14.
[Maximum mark: 1]
19M.1.sl.TZ2.14

Methane undergoes incomplete combustion.

2CH4 (g) + 3O2 (g) → 2CO (g) + 4H2O (g)

What is the enthalpy change, in kJ, using the bond enthalpy data given below?

 

A. [2(1077) + 4(463)] − [2(414) + 3(498)]

B. [2(414) + 3(498)] − [2(1077) + 4(463)]

C. [8(414) + 3(498)] − [2(1077) + 8(463)]

D. [2(1077) + 8(463)] − [8(414) + 3(498)]

[1]

Markscheme

C

Examiners report

65 % of the candidates chose the correct expression for determining the enthalpy change using bond enthalpies. The most commonly chosen distractor (C) had the signs reversed. The question had a good discrimination index.

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