CHEMISTRY-B-SALTERS-H433 · Cambridge OCR A Level
CHEMISTRY-B-SALTERS-H433/21
Paper 2
Chemistry B Salters · June 2024 · Variant 1
Relative difficulty
Analysis source: OCR
Analysis aligned to the official syllabus and assessment design.
3.8 / 5
270
360 min
Redox and Electrochemical Cells
Cohort performance
Session statistics from official examination reports
Total marks
270
Duration
360 min
Session difficulty
3.8 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
The June 2024 OCR A Level Chemistry B (Salters) series presented a challenging and thorough assessment across its components.
With a heavy focus on multi-step calculations, spectroscopy decoding, and practical laboratory evaluation, the papers required deep cognitive engagement and precise communication of structure and bonding trends.
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: 6100%Practical and
Weight: 583%Organic
Weight: 467%Synthesis & Physiological Explanation
Weight: 350%Chemical Equations
Weight: 233%Literacy
Weight: 117%
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. 82% of maximum mark
Level A
Approx. 69% of maximum mark
Level B
Approx. 58% of maximum mark
Level C
Approx. 47% of maximum mark
Level D
Approx. 36% of maximum mark
Level E
Approx. 26% 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.
State features in sequence or list observable properties — do not explain causes unless asked.
Match the expected response style for “Give” questions.
Match the expected response style for “Draw” questions.
Weigh arguments for and against with evidence; end with a supported judgement.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.5
Min per mark: 1.3
Min per mark: 1.2
Syllabus traceability
Topics linked to questions and mark weighting in this session
Redox (Elements from the sea (ES))
38 marks this session
Modern analytical techniques (Polymers and life (PL))
26 marks this session
Formulae, equations and amount of substance (Elements from the sea (ES))
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
Redox (Elements from the sea (ES))
Modern analytical techniques (Polymers and life (PL))
Formulae, equations and amount of substance (Elements from the sea (ES))
Kinetics (Developing fuels (DF))
Bonding and structure (Colour by design (CD))
Equilibrium (The chemical industry (CI))
Equilibria (acid–base) (Elements of life (EL))
Formulae, equations and amount of substance (Developing metals (DM))
Paper comparison
Marks and duration breakdown across papers in this session
H433/01 Fundamentals of Chemistry: H433/02 Scientific Literacy in Chemistry: H433/03 Practical Skills 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
Redox (Elements from the sea (ES))
38 marks this session
Practise in RevuiModern analytical techniques (Polymers and life (PL))
26 marks this session
Practise in RevuiFormulae, equations and amount of substance (Elements from the sea (ES))
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 June 2024 OCR A Level Chemistry B (Salters) series presented a challenging and thorough assessment across its components.
- 2Message
With a heavy focus on multi-step calculations, spectroscopy decoding, and practical laboratory evaluation, the papers required deep cognitive engagement and precise communication of structure and bonding trends.
Teacher briefing pack
One-page session summary for tutors and classroom review
June 2024 2024
Chemistry B Salters
The June 2024 OCR A Level Chemistry B (Salters) series presented a challenging and thorough assessment across its components. With a heavy focus on multi-step calculations, spectroscopy decoding, and practical laboratory evaluation, the papers required deep cognitive engagement a
The June 2024 OCR A Level Chemistry B (Salters) series presented a challenging and thorough assessment across its components.
With a heavy focus on multi-step calculations, spectroscopy decoding, and practical laboratory evaluation, the papers required deep cognitive engagement and precise communication of structure and bonding trends.
- Total marks
- 270
- Duration
- 360 min
- Session difficulty
- 3.8 / 5
Session analysis
The June 2024 OCR A Level Chemistry B (Salters) series presented a challenging and thorough assessment across its components. With a heavy focus on multi-step calculations, spectroscopy decoding, and practical laboratory evaluation, the papers required deep cognitive engagement and precise communication of structure and bonding trends.
Updated Jun 14, 2026
Paper breakdown
H433/01 Fundamentals of Chemistry: H433/02 Scientific Literacy in Chemistry: H433/03 Practical Skills 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.
72% 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 / Calculation
141·35·52%
Short Answer
75·45·28%
Multiple Choice
30·30·11%
Extended Writing
(Level of Response)
24·4·9%
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.
H433/01 Section A (
0.75 m/minH433/01 Section B (
0.84 m/minH433/03 Practical S
0.67 m/minTotal marks
170
Total time
225 min
Avg pace
0.76
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.
Kinetics (Developing fuels (DF))
85%85%
Redox (Developing metals (DM))
80%80%
Energy and matter (Oceans (O))
75%75%
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.