DP Chemistry (last assessment 2024)

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Question 19N.3.sl.TZ0.a

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.sl.TZ0.a
Level sl Paper 3 Time zone TZ0
Command term Describe Question number a Adapted from N/A
a.
[Maximum mark: 2]
19N.3.sl.TZ0.a

Catalysts are commonly used in industry.

Describe how a heterogeneous catalyst provides an alternative pathway for a reaction.

[2]

Markscheme

reactant(s) adsorb onto active sites/surface ✔

NOTE: Do not accept “absorb” for “adsorb” for M1.
Accept “bonds to” for “adsorb” for M1.


«reactant» bonds weakens «and products are desorbed» ✔

NOTE: Accept “bonds break/stretch «and products are desorbed»” for M2.
Award [1 max] for “lowers activation energy”.

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