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ocr A Level Chemistry B (Salters)(H433-02) Question Paper June2024.
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ocr A Level Chemistry B (Salters)(H433-02) Question Paper June2024.
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ocrTuesday 18 June 2024 – Morning
A Level Chemistry B (Salters)
H433/02 Scientific literacy in chemistry
Time allowed: 2 hours 15 minutes
You must have:
• a clean copy of the Advance Notice Article
(inside this document)
• the Data Sheet for Chemistry B
You can use:
• a scientific or graphical calculator
• an HB pencil
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
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.
• Use the Insert to answer Question 5.
• 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.
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, 2
1 Trans fats are made from carboxylic acids with double bonds in a trans
arrangement. They sometimes improve the texture of foods, but they are harmful to
health.
(a) Fig. 1.1 shows the structure of a fat molecule.
Fig. 1.1
H2C O A
O
HC O
B
H2C O O
C
O
(i) The side-chains formed by three carboxylic acids are labelled A, B and C.
Give the letter of the side-chain that is:
Saturated ...............
Trans unsaturated ...............
[1]
(ii) The fat molecule in Fig. 1.1 can be represented as shown below.
Complete the equation for the hydrolysis of the fat with aqueous NaOH.
H O
H C O C R'
O
H C O C R''
O
H C O C R'''
H
[3]
(b) Long-chain carboxylic acids can be identified by converting them to their methyl esters and then
using gas–liquid chromatography.
Write the equation for the conversion of RCOOH to its methyl ester using the appropriate alcohol.
[2]
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