DP Chemistry (last assessment 2024)

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Question 17N.3.sl.TZ0.5

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.3.sl.TZ0.5
Level sl Paper 3 Time zone TZ0
Command term Suggest Question number 5 Adapted from N/A
5.
[Maximum mark: 2]
17N.3.sl.TZ0.5

Catalysts can take many forms and are used in many industrial processes.

Suggest two reasons why it might be worth using a more expensive catalyst to increase the rate of a reaction.

[2]

Markscheme

Any two of:

greater selectivity

higher efficiency

longer life expectancy

OR

not easily poisoned

easier to recover

low«er» environmental impact

large range of conditions/temperatures/pressures supported

lower energy costs

increase in yield «per unit time» offsets cost of catalyst

[Max 2 Marks]

 

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