Tuesday 12 October 2021 – Morning
A Level Chemistry B (Salters)
H433/02 Scientific literacy in chemistry
Time allowed: 2 hours 15 minutes
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs
...
Tuesday 12 October 2021 – Morning
A Level Chemistry B (Salters)
H433/02 Scientific literacy in chemistry
Time allowed: 2 hours 15 minutes
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 100.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
Answer all the questions.
1 Gas-liquid chromatography can be used to analyse the components of car petrol.
sample
injector
waste
detector
flow controller
carrier gas column oven
A gas chromatograph
column
(a) (i) State an important property of the carrier gas.
...................................................................................................................................... [1]
(ii) What does the column consist of?
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(b) The first four components of a sample of petrol to emerge from the column are shown in
Table 1.1 in the order they come out.
1 methylbenzene
2 2-methylheptane
3 3-methylheptane
4 octane
Table 1.1
(i) Suggest the method used to identify these compounds as they emerge from the column.
...................................................................................................................................... [1]
(ii) Which of the compounds in Table 1.1 has the shortest retention time?
...................................................................................................................................... [1]
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