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Subjects
C
Cambridge
E
Pearson Edexcel
AQA
AQA
OCR
OCR
Competitive
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OCR · A Level · H433
Chemistry B (Salters)
Exam Guide
H433
CONQUER
Papers
01
Fundamentals of chemistry
Time
2h 15m
Marks
110
Weight
41%
02
Scientific literacy in chemistry
Time
2h 15m
Marks
100
Weight
37%
03
Practical skills in chemistry
Time
1h 30m
Marks
60
Weight
22%
04
Practical endorsement in chemistry
Time
Course practicals
Marks
—
Weight
Separate
Specification · Version 4.1 (May 2026) ocr.org.uk/
Grade boundaries
H433 · A Level
Weighted marks
June
Max
A*
A
B
C
D
E
Official source
2026
270
226
198
167
136
105
74
2024
270
221
186
156
127
98
69
June
2026
2024
Max
270
270
A*
226
221
A
198
186
B
167
156
C
136
127
D
105
98
E
74
69
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Chemistry B (Salters)
A Level · H433
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