DP Chemistry (first assessment 2025)

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Question 21M.2.SL.TZ1.5c

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.2.SL.TZ1.5c
Level	SL	Paper	2	Time zone	TZ1
Command term	Suggest	Question number	c	Adapted from	N/A

c.

[Maximum mark: 1]

21M.2.SL.TZ1.5c

(c)

Suggest two possible products of the incomplete combustion of ethene that would not be formed by complete combustion.

[1]

Markscheme

carbon monoxide/CO AND carbon/C/soot ✔

Syllabus sections

Reactivity 1. What drives chemical reactions? » Reactivity 1.3—Energy from fuels » Reactivity 1.3.1—Reactive metals, non-metals and organic compounds undergo combustion reactions when heated in oxygen. Deduce equations for reactions of combustion, including hydrocarbons and alcohols.

Reactivity 1. What drives chemical reactions? » Reactivity 1.3—Energy from fuels » Reactivity 1.3.2—Incomplete combustion of organic compounds, especially hydrocarbons, leads to the production of carbon monoxide and carbon. Deduce equations for the incomplete combustion of hydrocarbons and alcohols.