DP Chemistry (last assessment 2024)

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

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

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

(d)

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

[2]

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

The explanation of the high selectivity of zeolites, in terms of their structure, was very well answered and many scored both marks. A thorough understanding of zeolites was much better conveyed in N20 compared to previous sessions.

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