DP Chemistry (last assessment 2024)

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Question 20N.3.hl.TZ0.4a

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.hl.TZ0.4a
Level hl Paper 3 Time zone TZ0
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 2]
20N.3.hl.TZ0.4a

There has been significant growth in the use of carbon nanotubes, CNT.

(a)

Explain these properties of carbon nanotubes.

[2]

Markscheme

Excellent strength: defect-free AND rigid/regular 2D/3D ✔

Excellent conductivity: delocalized electrons ✔

Accept “carbons/atoms are all covalently bonded to each other” for M1.

Examiners report

The stronger candidates knew that the excellent conductivity associated with CNTs is associated with delocalised electrons but few scored the mark for citing the property associated with excellent strength, which can be attributed to being defect-free and having a rigid/regular 2D/3D structure.

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