surname names
Number Number
June 2025 Edexcel: A Level Chemistry
9CH0/01 Paper 1 – Advanced Inorganic
and Physical Chemistry – Merged
Question Paper & Mark Scheme
Morning (Time: 1 hour 45 minutes) Paper
Chemistry 🟐 🟐
Advanced
PAPER 1: Advanced Inorganic and Physical Chemistry
Instructions
•• Use black ink or ball-point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fill in the boxes at the top of this page with your name,
centre number and candidate number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
Information
• The total mark for this paper is 90.
•Exam
The marks for each question are shown in brackets
– useResource Summary
this as a guide as to how much time to spend on each question.
•paper
This June 2025 Edexcel
For the question marked A Level Chemistry
with an asterisk9CH0/01 document
(*), marks merges the
will be awarded forofficial question
your ability
and mark scheme for Paper 1: Advanced Inorganic and Physical Chemistry. It
to structure your answer logically, showing how the points that you make are related
covers key topics such as atomic structure, bonding and structure, redox chemistry, the
or follow on from each other where appropriate.
•
periodic table and amounts of substance, as well as other advanced physical chemistry
A Periodic
concepts. TheTable is printed
merged format on the back
provides cover with
students of this paper.insight into examiner
detailed
expectations, mark allocation and question style — supporting focused revision, self-
Advice
•
assessment and development of strong problem-solving and explanatory skills. An essential
Read
Show each question carefully
2025before youAstart to Chemistry
answer it. Paper
•
resource foryour
all excelling in
working the Edexcel
in calculations and Level
include units where 1 examination.
appropriate.
• Check your answers if you have time at the end. Turn over
P77832A
©2025 Pearson Education Ltd.
Y:1/1/1/
, Answer ALL questions.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 The table shows data for the three stable isotopes of argon.
Isotope Relative isotopic mass Percentage abundance
36
Ar 35.97 0.337
38
Ar 37.96 0.063
40
Ar 39.96 99.600
(a) State what is meant by the term ‘relative isotopic mass’.
(2)
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(b) State what is meant by the term ‘isotope’.
Illustrate your answer by referring to the numbers of sub-atomic particles in these
isotopes of argon.
(2)
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
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DO NOT WRITE IN THIS AREA
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2
■■■■
, (c) Calculate the relative atomic mass of argon.
Give your answer to two decimal places.
(2)
DO NOT WRITE IN THIS AREA
DO NOT WRITE IN THIS AREA
(Total for Question 1 = 6 marks)
DO NOT WRITE IN THIS AREA
3
■■■■ Turn over
, 2 This question is about some trends in properties of elements and compounds.
(a) The trend in the first ionisation energies for some of the first eleven elements
DO NOT WRITE IN THIS AREA
is shown.
Complete the graph by including the points for nitrogen, oxygen, and sodium.
(3)
2500
2000
1500
First ionisation
energy / kJ mol–1
1000
500
DO NOT WRITE IN THIS AREA
0
H He Li Be B C N O F Ne Na
Element
(b) Explain why the first ionisation energy of beryllium is higher than the
first ionisation energy of both lithium and boron.
(4)
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . . . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
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4
■■■■
Number Number
June 2025 Edexcel: A Level Chemistry
9CH0/01 Paper 1 – Advanced Inorganic
and Physical Chemistry – Merged
Question Paper & Mark Scheme
Morning (Time: 1 hour 45 minutes) Paper
Chemistry 🟐 🟐
Advanced
PAPER 1: Advanced Inorganic and Physical Chemistry
Instructions
•• Use black ink or ball-point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fill in the boxes at the top of this page with your name,
centre number and candidate number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
Information
• The total mark for this paper is 90.
•Exam
The marks for each question are shown in brackets
– useResource Summary
this as a guide as to how much time to spend on each question.
•paper
This June 2025 Edexcel
For the question marked A Level Chemistry
with an asterisk9CH0/01 document
(*), marks merges the
will be awarded forofficial question
your ability
and mark scheme for Paper 1: Advanced Inorganic and Physical Chemistry. It
to structure your answer logically, showing how the points that you make are related
covers key topics such as atomic structure, bonding and structure, redox chemistry, the
or follow on from each other where appropriate.
•
periodic table and amounts of substance, as well as other advanced physical chemistry
A Periodic
concepts. TheTable is printed
merged format on the back
provides cover with
students of this paper.insight into examiner
detailed
expectations, mark allocation and question style — supporting focused revision, self-
Advice
•
assessment and development of strong problem-solving and explanatory skills. An essential
Read
Show each question carefully
2025before youAstart to Chemistry
answer it. Paper
•
resource foryour
all excelling in
working the Edexcel
in calculations and Level
include units where 1 examination.
appropriate.
• Check your answers if you have time at the end. Turn over
P77832A
©2025 Pearson Education Ltd.
Y:1/1/1/
, Answer ALL questions.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 The table shows data for the three stable isotopes of argon.
Isotope Relative isotopic mass Percentage abundance
36
Ar 35.97 0.337
38
Ar 37.96 0.063
40
Ar 39.96 99.600
(a) State what is meant by the term ‘relative isotopic mass’.
(2)
DO NOT WRITE IN THIS AREA
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
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(b) State what is meant by the term ‘isotope’.
Illustrate your answer by referring to the numbers of sub-atomic particles in these
isotopes of argon.
(2)
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
DO NOT WRITE IN THIS AREA
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . . . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. .. . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . ......................
2
■■■■
, (c) Calculate the relative atomic mass of argon.
Give your answer to two decimal places.
(2)
DO NOT WRITE IN THIS AREA
DO NOT WRITE IN THIS AREA
(Total for Question 1 = 6 marks)
DO NOT WRITE IN THIS AREA
3
■■■■ Turn over
, 2 This question is about some trends in properties of elements and compounds.
(a) The trend in the first ionisation energies for some of the first eleven elements
DO NOT WRITE IN THIS AREA
is shown.
Complete the graph by including the points for nitrogen, oxygen, and sodium.
(3)
2500
2000
1500
First ionisation
energy / kJ mol–1
1000
500
DO NOT WRITE IN THIS AREA
0
H He Li Be B C N O F Ne Na
Element
(b) Explain why the first ionisation energy of beryllium is higher than the
first ionisation energy of both lithium and boron.
(4)
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DO NOT WRITE IN THIS AREA
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4
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