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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.
A-level
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
7405/1
Monday 12 June 2023 Morning Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
the Periodic Table/Data Booklet, provided as an insert (enclosed)
a ruler with millimetre measurements Question Mark
a scientific calculator, which you are expected to use where appropriate. 1
2
Instructions
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. 9
Do all rough work in this book. Cross through any work you do not 10
want to be marked.
TOTAL
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 105.
official
,official
, 2
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
Do not write
outside the
The compound [Cr(NH3)4Cl2]Cl contains ammonia molecules. box
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]
10
CrCl3 + 5 H2O →
Turn over ►
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
7405/1
Monday 12 June 2023 Morning Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
the Periodic Table/Data Booklet, provided as an insert (enclosed)
a ruler with millimetre measurements Question Mark
a scientific calculator, which you are expected to use where appropriate. 1
2
Instructions
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. 9
Do all rough work in this book. Cross through any work you do not 10
want to be marked.
TOTAL
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 105.
official
,official
, 2
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
Do not write
outside the
The compound [Cr(NH3)4Cl2]Cl contains ammonia molecules. box
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]
10
CrCl3 + 5 H2O →
Turn over ►
