DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ2.4e

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.hl.TZ2.4e
Level hl Paper 3 Time zone TZ2
Command term Write Question number e Adapted from N/A
e.
[Maximum mark: 1]
19M.3.hl.TZ2.4e

Metals are extracted from their ores by several methods, including electrolysis and reduction with carbon.

(e)

Carbon nanotubes are added to metals to increase tensile strength.

Write an equation for the formation of carbon nanotubes from carbon monoxide.

[1]

Markscheme

2CO (g) → C (s) + CO2 (g)  [✔]

Examiners report

Carbon nanotubes proved to be difficult for the majority of the candidates. Hardly any candidates stated an equation for the formation of carbon nanotubes from carbon monoxide.

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