DP Chemistry (last assessment 2024)

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

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.hl.TZ2.4c
Level hl Paper 3 Time zone TZ2
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
19M.3.hl.TZ2.4c

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

(c)

Explain the action of metals as heterogeneous catalysts.

[2]

Markscheme

Any two of:
reactant(s) adsorb onto active sites/surface  [✔]

bonds weakened/broken/stretched «in adsorbed reactants»
OR
activation energy lowered [✔]

products desorbed [✔]

 

Note: Accept “products released” for M3.

Examiners report

This question was reasonably answered with many candidates receiving a mark for the action of a catalyst. The terms adsorbed and desorbed were often missing.

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