AQA
A-level
CHEMISTRY
7405/1
Paper 1 Inorganic and Physical Chemistry
Version: 1.0 Final
*JUN237405101*
IB/M/Jun23/E9 7405/1
For Examiner’s
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Question Mark
1
2
3
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5
6
7
8
9
10
TOTAL
Monday 12 June 2023 Morning Time allowed: 2 hours
Materials
For this paper you must have:
• the Periodic Table/Data Booklet, provided as an insert (enclosed)
• a ruler with millimetre measurements
• a scientific calculator, which you are expected to use where appropriate.
Instructions
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page.
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages.
• 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).
• All working must be shown.
• Do all rough work in this book. Cross through any work you do not
want to be marked.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 105.
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
2
*02*
IB/M/Jun23/7405/1
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 This question is about complexes of the transition metal chromium.
0 1 . 1 State the meaning of the term transition metal complex.
[1 mark]
Cr(PF3)6 is a complex of chromium that contains molecules of PF3
0 1 . 2 The electron pair repulsion theory can be used to predict the shape of a PF3 molecule.
Draw the shape of a PF3 molecule.
Include any lone pairs of electrons that influence the shape.
Name the shape.
[2 marks]
Shape
Name of shape
0 1 . 3 Suggest why the oxidation state of chromium is zero in Cr(PF3)6
[1 mark]
3
*03*
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IB/M/Jun23/7405/1
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outside the
The compound [Cr(NH box 3)4Cl2]Cl contains ammonia molecules.
0 1 . 4 Deduce the oxidation state of chromium in [Cr(NH3)4Cl2]Cl
[1 mark]
0 1 . 5 Name the type of bond between N and H in ammonia.
[1 mark]
0 1 . 6 The compound [Cr(NH3)4Cl2]Cl contains a complex ion that shows isomerism.
Draw the two isomers of the complex ion.
State the type of isomerism shown.
[3 marks]
Isomer 1 Isomer 2
Type of isomerism
0 1 . 7 Complete the equation to show the formation of one complex that contains chromium
in its +3 oxidation state.
[1 mark]
CrCl3 + 5H2O → 10
4
*04*
IB/M/Jun23/7405/1
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outside the
box 0 2 Figure 1 shows a cell used to measure the standard electrode potential for the
half-cell
Mg2+(aq) + 2 e– → Mg(s)
Figure 1
0 2 . 1 State the purpose of the salt bridge.
Identify an ionic compound that could be used in the salt bridge.
[2 marks]
Purpose
Identity
0 2 . 2 State how, if at all, the EMF of this cell will change if the surface area of the platinum
electrode is increased.
[1 mark]
5
*05*
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IB/M/Jun23/7405/1
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outside the
The standard electrode potential, Eo for the half-cell is shown. box
Mg2+(aq) + 2 e– → Mg(s) Eo = –2.38 V
0 2 . 3 Water is added to the beaker containing the magnesium chloride solution.
What is the effect on the magnitude of the EMF of the cell?
[1 mark]
Tick () one box.
EMF increases
EMF stays the same
EMF decreases
0 2 . 4 The voltmeter V shown in Figure 1 is replaced by a bulb.
Give an equation for the overall reaction that occurs when the cell is operating.
[1 mark]
Turn over for the next question
5
6
*06*
IB/M/Jun23/7405/1
Do not write
outside the
box 0 3 This question is about Period 3 elements and their oxides.
0 3 . 1 Give an equation for the reaction between phosphorus and an
excess of oxygen.
[1 mark]
0 3 . 2 Give an equation for the reaction between sulfur dioxid [Show Less]