worked solutions
model answers
, Oxford Cambridge and RSA
Friday 20 June 2025 – Morning
A Level Chemistry A
H432/03 Unified chemistry
Time allowed: 1 hour 30 minutes
You must have:
* 1 8 4 9 1 6 2 3 2 2 *
• the Data Sheet for Chemistry A
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 4 3 2 0 3 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/5255/2] OCR is an exempt Charity
DC (WW/JG) 345058/3 Turn over
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model answers
, Oxford Cambridge and RSA
Friday 20 June 2025 – Morning
A Level Chemistry A
H432/03 Unified chemistry
Time allowed: 1 hour 30 minutes
You must have:
* 1 8 4 9 1 6 2 3 2 2 *
• the Data Sheet for Chemistry A
You can use:
• a scientific or graphical calculator
• an HB pencil
* H 4 3 2 0 3 *
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/5255/2] OCR is an exempt Charity
DC (WW/JG) 345058/3 Turn over
for more: tyrionpapers.com
, 2
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR 2025
for more: tyrionpapers.com
