DP Chemistry (last assessment 2024)

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Question 18M.3.hl.TZ1.20b

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Date May 2018 Marks available [Maximum mark: 3] Reference code 18M.3.hl.TZ1.20b
Level hl Paper 3 Time zone TZ1
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 3]
18M.3.hl.TZ1.20b

Organic solvents are commonly used in the pharmaceutical industry.

(b)

Explain how hexane and propanone may be separated by fractional distillation.

[3]

Markscheme

Any three of:

different molar masses

OR

different strength of intermolecular forces

 

different boiling points

temperature in «fractionating» column decreases upwards

 

«components» condense at different temperatures/heights

OR

«component with» lower boiling point leaves column first

 

[3 marks]

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