CHEMISTRY-9CH0 · Pearson Edexcel A Level
CHEMISTRY-9CH0/31
(9CH0/03)
Chemistry · 2024 · Variant 1
Relative difficulty
Analysis source: Pearson Edexcel
Analysis aligned to the official syllabus and assessment design.
4.0 / 5
300
360 min
Organic Synthesis and Stereochemistry
Cohort performance
Session statistics from official examination reports
Total marks
300
Duration
360 min
Session difficulty
4.0 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
High-scoring candidates distinguished themselves in the major structured calculation blocks.
Large mark allocations were concentrated in:
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 & Calculation
Weight: 7100%Practical & Experimental
Weight: 686%Organic
Weight: 457%Mechanism
Weight: 343%Conceptual Explanation
Weight: 229%
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. 84% of maximum mark
Level A
Approx. 72% of maximum mark
Level B
Approx. 59% of maximum mark
Level C
Approx. 46% of maximum mark
Level D
Approx. 33% of maximum mark
Level E
Approx. 20% 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
Show formula, substitution, and unit; method marks need visible working.
Give reasons and link mechanism to outcome; each point needs a because/so chain.
State features in sequence or list observable properties — do not explain causes unless asked.
Match the expected response style for “Deduce” questions.
Match the expected response style for “Draw” questions.
Match the expected response style for “Write” questions.
Match the expected response style for “State” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 0.2
Min per mark: 0
Syllabus traceability
Topics linked to questions and mark weighting in this session
Organic Chemistry III
49 marks this session
Formulae, Equations and Amounts of Substance (Paper 1)
35 marks this session
Energetics II (Paper 1)
33 marks this session
Acid-base Equilibria
31 marks this session
Organic Chemistry I
30 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
Difficulty trend
How session difficulty has shifted across recent years
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 III
49 marks this session
Practise in RevuiFormulae, Equations and Amounts of Substance (Paper 1)
35 marks this session
Practise in RevuiEnergetics II (Paper 1)
33 marks this session
Practise in RevuiAcid-base Equilibria
31 marks this session
Practise in RevuiOrganic Chemistry I
30 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
High-scoring candidates distinguished themselves in the major structured calculation blocks.
- 2Message
Large mark allocations were concentrated in:
Teacher briefing pack
One-page session summary for tutors and classroom review
2024 2024
Chemistry
High-scoring candidates distinguished themselves in the major structured calculation blocks. Large mark allocations were concentrated in:
High-scoring candidates distinguished themselves in the major structured calculation blocks.
Large mark allocations were concentrated in:
- Total marks
- 300
- Duration
- 360 min
- Session difficulty
- 4.0 / 5
Session analysis
High-scoring candidates distinguished themselves in the major structured calculation blocks. Large mark allocations were concentrated in:
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.
75% 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.
Structured
(Long Answer)
158·22·53%
Mathematical/Calculations
82·18·27%
Mechanism/Drawing
42·12·14%
Multiple Choice
18·18·6%
Study ROI
Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.
Time vs marks
Compare marks with suggested time allocation to plan exam pacing.
Paper 1: Advanced I…
180.20 m/minPaper 2: Advanced O…1
4.02 m/minTotal marks
1102
Total time
55 min
Avg pace
20.04
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Transition Metal Ligand Substitution & Stability Constants
85%85%
Chromatography (Rf values & Gas Chromatography)
80%80%
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.