DP Chemistry (last assessment 2024)

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

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

This was a very popular option with approximately 34% of candidates attempting Option B. Many students appeared well prepared for this option. Some candidates continue to provide answers with a heavy Biology bias that often make them lose valuable points.

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