CHEMISTRY-9CH0 · Pearson Edexcel A Level
CHEMISTRY-9CH0/31
(9CH0/03)
Chemistry · 2023 · Variant 1
Relative difficulty
Analysis source: Pearson Edexcel
Analysis aligned to the official syllabus and assessment design.
3.8 / 5
300
360 min
Organic Reaction Mechanisms and Synthesis
Cohort performance
Session statistics from official examination reports
Total marks
300
Duration
360 min
Session difficulty
3.8 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
The Summer 2023 GCE Chemistry examination series (9CH0) presented a highly balanced and rigorous assessment of inorganic, organic, and physical chemistry.
The overall difficulty has been assessed at a strong 3.8 out of 5, characterized by deep practical focus, challenging multi-step stoichiometry, and demanding organic mechanism drawings.
Question difficulty map
How candidates performed on each question in this series
No data available in official reports
Assessment objectives
Skill and AO weighting from official examiner commentary
Skill weighting
Shows the skill mix this paper tested most heavily.
Mathematical /
Weight: 8100%Organic
Weight: 788%Mechanism
Weight: 675%Practical
Weight: 563%Design
Weight: 450%Trends and Periods
Weight: 338%Periodicity Thermodynamic & E
Weight: 225%
Method marks watchlist
Where working, steps, or method marks were commonly lost
No data available in official reports
Recurring mistakes across years
Themes examiners flag in multiple recent sessions for this subject
No data available in official reports
Question choice intelligence
Mean scores and popularity for optional questions (HKDSE electives)
No data available in official reports
Level exemplars
What candidate scripts at each grade level looked like
No data available in official reports
Grade & admission context
How marks relate to grade thresholds and entry standards
Report type
Examiner report — national grade boundaries and question-level commentary
Level A*
Approx. 80% of maximum mark
Level A
Approx. 65% of maximum mark
Level B
Approx. 53% of maximum mark
Level C
Approx. 40% of maximum mark
Level D
Approx. 28% of maximum mark
Level E
Approx. 16% of maximum mark
Deep insights
What top candidates did
Techniques and approaches examiners rewarded in this series
No data available in official reports
Command word playbook
How to match each command word to the expected response style
Give reasons and link mechanism to outcome; each point needs a because/so chain.
Show formula, substitution, and unit; method marks need visible working.
Match the expected response style for “State” questions.
Match the expected response style for “Deduce” questions.
State features in sequence or list observable properties — do not explain causes unless asked.
Match the expected response style for “Draw” questions.
Match the expected response style for “contrast” questions.
Match the expected response style for “Devise” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.3
Min per mark: 1.2
Min per mark: 1.2
Syllabus traceability
Topics linked to questions and mark weighting in this session
Organic Chemistry I
34 marks this session
Kinetics II
32 marks this session
Organic Chemistry III
28 marks this session
Transition Metals
22 marks this session
Equilibrium II
22 marks this session
MCQ trap analytics
Commonly chosen wrong options from examiner commentary
No data available in official reports
Topic heatmap across years
Mark concentration by topic and exam year for this subject
Mark intensity
Organic Chemistry III
Organic Chemistry I
Formulae, Equations and Amounts of Substance (Paper 1)
Acid-base Equilibria (Paper 1)
Organic Chemistry II (Paper 2)
Energetics II (Paper 1)
Kinetics II
Acid-base Equilibria
Paper comparison
Marks and duration breakdown across papers in this session
Paper 1: Advanced Inorganic and Physical Chemistry:
Paper 2: Advanced Organic and Physical Chemistry:
Paper 3: General and Practical Principles in Chemistry:
Marks you can still earn
Where valid approaches outside the mark scheme may still gain credit
No data available in official reports
Practise what examiners flagged
Target weak topics from this report inside the Revui app
Organic Chemistry I
34 marks this session
Practise in RevuiKinetics II
32 marks this session
Practise in RevuiOrganic Chemistry III
28 marks this session
Practise in RevuiTransition Metals
22 marks this session
Practise in RevuiEquilibrium II
22 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
The Summer 2023 GCE Chemistry examination series (9CH0) presented a highly balanced and rigorous assessment of inorganic, organic, and physical chemistry.
- 2Message
The overall difficulty has been assessed at a strong 3.8 out of 5, characterized by deep practical focus, challenging multi-step stoichiometry, and demanding organic mechanism drawings.
Teacher briefing pack
One-page session summary for tutors and classroom review
2023 2023
Chemistry
The Summer 2023 GCE Chemistry examination series (9CH0) presented a highly balanced and rigorous assessment of inorganic, organic, and physical chemistry. The overall difficulty has been assessed at a strong 3.8 out of 5, characterized by deep practical focus, challenging multi-s
The Summer 2023 GCE Chemistry examination series (9CH0) presented a highly balanced and rigorous assessment of inorganic, organic, and physical chemistry.
The overall difficulty has been assessed at a strong 3.8 out of 5, characterized by deep practical focus, challenging multi-step stoichiometry, and demanding organic mechanism drawings.
- Total marks
- 300
- Duration
- 360 min
- Session difficulty
- 3.8 / 5
Session analysis
The Summer 2023 GCE Chemistry examination series (9CH0) presented a highly balanced and rigorous assessment of inorganic, organic, and physical chemistry. The overall difficulty has been assessed at a strong 3.8 out of 5, characterized by deep practical focus, challenging multi-step stoichiometry, and demanding organic mechanism drawings.
Updated Jun 14, 2026
Paper breakdown
Paper 1: Advanced Inorganic and Physical Chemistry:
Paper 2: Advanced Organic and Physical Chemistry:
Paper 3: General and Practical Principles in Chemistry:
Top chapters
Exam structure insights
Marks by chapter
See where the marks were concentrated so revision time goes to the highest-value topics.
Mark accessibility
Estimate which marks were basic, mid-level, or high-difficulty.
73% within easy or medium reach
Command word frequency
Spot common command words so answers match the expected response style.
Question type mix
Compare the mark share of each paper section and question type.
Short Answer
(1-3 marks)
135·68·45%
Structured / Mathematical
(4-5 marks)
98·22·33%
Extended Open / Level of Response
(6+ marks)
42·7·14%
Multiple Choice
(MCQ)
25·25·8%
Study ROI
Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.
Difficulty trend
Compare difficulty across recent years.
Time vs marks
Compare marks with suggested time allocation to plan exam pacing.
Paper 1 Section A
0.86 m/minPaper 2 Section A
0.86 m/minPaper 3 Section A
0.80 m/minTotal marks
300
Total time
360 min
Avg pace
0.83
Cumulative marks ladder
The line is your running mark total question by question; dashed lines are the estimated grade cut-offs. See which question the line crosses your target grade at, so you know how far you must answer cleanly and which questions decide a band.
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Organic Chemistry I
90%90%
Acid-base Equilibria
85%85%
Modern Analytical Techniques I (Paper 2)
75%75%
Redox I (Paper 2)
65%65%
Paper analysis
The Summer 2023 GCE Chemistry examination series (9CH0) presented a highly balanced and rigorous assessment of inorganic, organic, and physical chemistry. The overall difficulty has been assessed at a strong 3.8 out of 5, characterized by deep practical focus, challenging multi-step stoichiometry, and demanding organic mechanism drawings.
Exam tips
Paper format
- Duration
- 2h 30min
- Total marks
- 120
- Weighting
- 40%
- Question types
- Structured, Practical & Calculations
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.