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ocr AS Level Chemistry A (H032-02) Question Paper May2024.
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ocr AS Level Chemistry A (H032-02) Question Paper May2024.
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ocrTuesday 21 May 2024 – Morning
AS Level Chemistry A
H032/02 Depth in chemistry
Time allowed: 1 hour 30 minutes
You must have:
the Data Sheet for Chemistry A
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.
• 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 70.
• 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.
Turn over
final
,final
, 3
1 This question is about water, H2O, and ammonia, NH3.
(a) Hydrogen and oxygen have different electronegativities.
What is meant by the term electronegativity?
..........................................................................................................................................................
..........................................................................................................................................................
................................................................................................................................................... [2]
(b) H2O is a polar molecule that has hydrogen bonding.
(i) Complete the diagram below to show hydrogen bonding between the H2O molecule shown and
another H2O molecule.
Include relevant dipoles and lone pairs.
Label the hydrogen bond.
O
H H
[2]
(ii) Explain why molecules of H2O are polar.
..........................................................................................................................................................
..........................................................................................................................................................
................................................................................................................................................... [1]
(iii) One unusual property of H2O is that ice floats on
water. Explain why ice has a lower density than water.
..........................................................................................................................................................
..........................................................................................................................................................
................................................................................................................................................... [1]
final Turn over
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