CHEMISTRY · HKDSE
CHEMISTRY/11
(Compulsory Part)
Chemistry · 2025 · Variant 1
Relative difficulty
Analysis source: Hong Kong Examinations and Assessment Authority (HKEAA)
Analysis aligned to the official syllabus and assessment design.
3.5 / 5
162
210 min
Organic Chemistry Synthesis & Structural Identification
Cohort performance
Session statistics from official examination reports
Total marks
162
Duration
210 min
Session difficulty
3.5 / 5
Level 5**
~92% of max
Level 5*
~85% of max
Level 5
~76% of max
Key examiner messages
Top priorities from the principal examiner before you revise
The 2025 HKDSE Chemistry paper presents a highly standard assessment structure, featuring a fair but rigorous conceptual layout. While the basic sections contain routine recall items (such as naming anodisation and detailing flame tests), the paper quickly shifts towards demandin
While the basic sections contain routine recall items (such as naming anodisation and detailing flame tests), the paper quickly shifts towards demanding structural deductions and quantitative computations.
The difficulty is graded beautifully, ensuring that average candidates can secure basic marks while allowing elite students to shine through complex questions, such as the cyclic ester (lactone) synthesis and the full mechanism description of a hydrogen-oxygen fuel cell.
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.
Quantitative
Weight: 6100%Chemical Nomenclature
Weight: 583%Experimental
Weight: 350%Conceptual Explanation
Weight: 233%
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
Reporting source
HKEAA Subject Examination Report — comments on candidates’ performance with marking schemes
Level 5**
Outstanding — competitive JUPAS programmes (medicine, law, top faculties)
Level 5*
Excellent — strong JUPAS profile for selective programmes
Level 5
Good — meets most university entrance requirements
Level 4
Satisfactory — foundation programmes or less selective routes
Level 3
Pass threshold for many sub-degree and vocational pathways
Admission context
Levels feed JUPAS and non-JUPAS university applications; 5** and 5* are most selective
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.
Apply knowledge to an unfamiliar context; concise, practical points score best.
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.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.5
Min per mark: 1.5
Min per mark: 1.4
Min per mark: 1.3
Syllabus traceability
Topics linked to questions and mark weighting in this session
Reactions of Carbon Compounds (Inter-conversions)
18 marks this session
Enthalpy changes; Hess’s Law; energy cycles
12 marks this session
Oxidation numbers, redox reactions & electrolysis
11 marks this session
Kinetics, activation energy & rate laws
11 marks this session
Instrumental analysis (IR, Chromatography)
11 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
Enthalpy changes; Hess’s Law; energy cycles
Redox Reactions, Chemical Cells & Electrolysis
Reactions of Carbon Compounds (Inter-conversions)
Isomerism & Chemistry of Carbon Compounds
Homologous series; naming; addition polymerisation
Metals (Reactivity, displacement, extraction)
Reactions and Inter-conversions of Carbon Compounds
Instrumental analytical methods (Analytical Chemistry)
Paper comparison
Marks and duration breakdown across papers in this session
Paper 1 (Section A & B):
Paper 2 (Electives - Industrial & Analytical):
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
Reactions of Carbon Compounds (Inter-conversions)
18 marks this session
Practise in RevuiEnthalpy changes; Hess’s Law; energy cycles
12 marks this session
Practise in RevuiOxidation numbers, redox reactions & electrolysis
11 marks this session
Practise in RevuiKinetics, activation energy & rate laws
11 marks this session
Practise in RevuiInstrumental analysis (IR, Chromatography)
11 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
The 2025 HKDSE Chemistry paper presents a highly standard assessment structure, featuring a fair but rigorous conceptual layout. While the basic sections contain routine recall items (such as naming anodisation and detailing flame tests), the paper quickly shifts towards demandin
- 2Message
While the basic sections contain routine recall items (such as naming anodisation and detailing flame tests), the paper quickly shifts towards demanding structural deductions and quantitative computations.
- 3Message
The difficulty is graded beautifully, ensuring that average candidates can secure basic marks while allowing elite students to shine through complex questions, such as the cyclic ester (lactone) synthesis and the full mechanism description of a hydrogen-oxygen fuel cell.
Teacher briefing pack
One-page session summary for tutors and classroom review
2025 2025
Chemistry
The 2025 HKDSE Chemistry paper presents a highly standard assessment structure, featuring a fair but rigorous conceptual layout. While the basic sections contain routine recall items (such as naming anodisation and detailing flame tests), the paper quickly shifts towards demandin
The 2025 HKDSE Chemistry paper presents a highly standard assessment structure, featuring a fair but rigorous conceptual layout. While the basic sections contain routine recall items (such as naming anodisation and detailing flame tests), the paper quickly shifts towards demandin
While the basic sections contain routine recall items (such as naming anodisation and detailing flame tests), the paper quickly shifts towards demanding structural deductions and quantitative computations.
The difficulty is graded beautifully, ensuring that average candidates can secure basic marks while allowing elite students to shine through complex questions, such as the cyclic ester (lactone) synthesis and the full mechanism description of a hydrogen-oxygen fuel cell.
- Total marks
- 162
- Duration
- 210 min
- Session difficulty
- 3.5 / 5
- Level 5**
- ~92% of max
- Level 5*
- ~85% of max
- Level 5
- ~76% of max
Session analysis
The 2025 HKDSE Chemistry paper presents a highly standard assessment structure, featuring a fair but rigorous conceptual layout. While the basic sections contain routine recall items (such as naming anodisation and detailing flame tests), the paper quickly shifts towards demanding structural deductions and quantitative computations. The difficulty is graded beautifully, ensuring that average candidates can secure basic marks while allowing elite students to shine through complex questions, such as the cyclic ester (lactone) synthesis and the full mechanism description of a hydrogen-oxygen fuel cell.
Updated Jun 11, 2026
Paper breakdown
Paper 1 (Section A & B):
Paper 2 (Electives - Industrial & Analytical):
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.
80% 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 Questions
(SAQ)
62·20·38%
Structured/Calculation Questions
50·12·31%
Multiple Choice
(MC)
36·36·22%
Essay / Long Response Questions
14·2·9%
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 1A (Multiple
0.80 m/minPaper 1B Part II (A
0.72 m/minPaper 2 Section A (
0.67 m/minPaper 2 Section C (
0.67 m/minTotal marks
105
Total time
145 min
Avg pace
0.72
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.
Green Chemistry: Quantitative Atom Economy and Percentage Yield
88%88%
Transition Metal Complexes & Variable Oxidation States
85%85%
Lead-Acid & Lithium-Ion Cell Chemistry
75%75%
Difficulty Verdict: Solid Core with Sharp Screeners
The 2025 HKDSE Chemistry paper presents a highly standard assessment structure, featuring a fair but rigorous conceptual layout. While the basic sections contain routine recall items (such as naming anodisation and detailing flame tests), the paper quickly shifts towards demanding structural deductions and quantitative computations. The difficulty is graded beautifully, ensuring that average candidates can secure basic marks while allowing elite students to shine through complex questions, such as the cyclic ester (lactone) synthesis and the full mechanism description of a hydrogen-oxygen fuel cell.
Exam tips
Paper format
- Duration
- 2h 30min
- Total marks
- 122
- Weighting
- 60%
- Question types
- Multiple Choice (MC), Short Answer Questions (SAQ), Structured/Calculation Questions
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.