DP Chemistry (last assessment 2024)

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

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.3.sl.TZ0.4c
Level sl Paper 3 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 1]
20N.3.sl.TZ0.4c

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

(c)

Zeolites can be used as catalysts in the manufacture of CNT. Explain, with reference to their structure, the high selectivity of zeolites.

[1]

Markscheme

pores/cavities/channels/holes/cage-like structures ✔

«only» reactants with appropriate/specific size/geometry/structure fit inside/go through/are activated/can react ✔


Accept “molecules/ions” for “reactants” in M2.

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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