Exam (elaborations)
aqa as level chemistry paper 1
aqa as level chemistry paper 1
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By: ameerahayaz05 • 1 year ago
By: prakashfamily06 • 1 year ago
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Please write clearly in block capitals.Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
1
AS
ar
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry ah
am
Time allowed: 1 hour 30 minutes
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Materials
For this paper you must have: For Examiner’s Use
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• the Periodic Table/Data Sheet, provided as an insert (enclosed)
• a ruler with millimetre measurements Question Mark
• a scientific calculator, which you are expected to use where appropriate. 1
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2
Instructions
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3
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 4
@
• Answer all questions. 5
• You must answer the questions in the spaces provided. Do not write outside 6
the box around each page or on blank pages.
7
• If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). 8
• All working must be shown. Section B
• Do all rough work in this book. Cross through any work you do not
want to be marked. TOTAL
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
*JUN227404101*
IB/M/Jun22/E7 7404/1
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 This question is about ionisation energies of Group 2 elements.
0 1 . 1 Explain why the first ionisation energy of the Group 2 elements decreases down the
group.
[2 marks]
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0 1 . 2
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Give an equation, including state symbols, to represent the process that occurs when
the third ionisation energy of magnesium is measured.
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[1 mark]
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0 1 . 3 Explain why the third ionisation energy of magnesium is much higher than the
second ionisation energy of magnesium.
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[2 marks]
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5
*02*
IB/M/Jun22/7404/1
, 3
Do not write
outside the
0 2 This question is about acid–base titrations. box
Citric acid reacts with sodium hydroxide.
C6H8O7(aq) + 3 NaOH(aq) → Na3C6H5O7(aq) + 3 H2O(l)
0 2 . 1 A student makes a solution of citric acid by dissolving some solid citric acid in water.
Describe a method to add an accurately known mass of solid to a beaker to make
a solution.
[2 marks]
1
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ah
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0 2 . 2 The student dissolves 0.834 g of citric acid in water and makes the solution up to
500 cm3
Calculate the concentration, in mol dm–3, of citric acid in this solution.
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[3 marks]
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Concentration mol dm–3
Turn over ►
*03*
IB/M/Jun22/7404/1
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