DP Chemistry (last assessment 2024)

Question 20N.3.hl.TZ0.11e(iii)

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.3.hl.TZ0.11e(iii)
Level	hl	Paper	3	Time zone	TZ0
Command term	Suggest	Question number	e(iii)	Adapted from	N/A

e(iii).

[Maximum mark: 1]

20N.3.hl.TZ0.11e(iii)

Gasoline (petrol), biodiesel and ethanol are fuels.

[U.S. Department of Energy. https://afdc.energy.gov/]

(e(iii))

Suggest a wavenumber absorbed by methane gas.

[1]

Markscheme

any value or range within $2850 - 3090 « {cm}^{- 1} »$ ✔

Examiners report

The main issue with this question was that a high percentage of candidates did not realise that wavenumber is the reciprocal of wavelength and hence wavenumber has typical units of cm^-1. Many incorrectly gave wavelength values, in nm, which did not answer the question posed.

Syllabus sections

Core

Core » Topic 10: Organic chemistry » 10.1 Fundamentals of organic chemistry

Core » Topic 1: Stoichiometric relationships » 1.3 Reacting masses and volumes

Core » Topic 1: Stoichiometric relationships

Core » Topic 10: Organic chemistry

Question 20N.3.hl.TZ0.11e(iii)

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