DP Chemistry (first assessment 2025)

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Question 20N.2.SL.TZ0.9a

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.2.SL.TZ0.9a
Level	SL	Paper	2	Time zone	TZ0
Command term	Calculate	Question number	a	Adapted from	N/A

a.

[Maximum mark: 1]

20N.2.SL.TZ0.9a

(a)

Calculate the energy released, in $kJ$ , from the complete combustion of $5.00 {dm}^{3}$ of ethanol.

[1]

Markscheme

$« 21 200 kJ {dm}^{- 3} \times 5.00 {dm}^{3} = » 106000 / 1.06 \times 10^{5} « kJ »$ ✔

Examiners report

Even rather weak candidates answered this one correctly.

Syllabus sections

Reactivity 1. What drives chemical reactions? » Reactivity 1.3—Energy from fuels » Reactivity 1.3.3—Fossil fuels include coal, crude oil and natural gas, which have different advantages and disadvantages. Evaluate the amount of carbon dioxide added to the atmosphere when different fuels burn. Understand the link between carbon dioxide levels and the greenhouse effect.