2025 OCR GCSE COMBINED SCIENCE A (GATEWAY SCIENCE)
J250/10 CHEMISTRY (HIGHER TIER)
Complete Question paper with Marking Scheme
Combined
Oxford Cambridge and RSA
Friday 13 June 2025 – Morning
GCSE (9–1) Combined Science A (Gateway Science)
J250/10 Chemistry (Higher Tier)
Time allowed: 1 hour 10 minutes
You must have:
• a ruler (cm/mm)
H
• the Data Sheet for GCSE (9–1) Combined
Science A (Chemistry) (inside this
document)
You can use:
• a scientific or graphical calculator
• an HB pencil
* J 2 5 01 0 *
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 60.
• 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 24 pages.
, ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 OCR is an exempt
[601/8687/2] DC Charity Turn over
(WW/CB)
351886/4
,
, 2
Section A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
1 The equation shows a reaction that has reached dynamic equilibrium.
N2(g) + 3H2(g) 2NH3(g)
Which statement explains why this reaction is a dynamic equilibrium?
A N2 and H2 are gases.
B The rates of the forward and reverse reactions are equal.
C The reaction has stopped.
D The reaction produces a 100% yield of NH3.
Your answer [1]
© OCR 2025
J250/10 CHEMISTRY (HIGHER TIER)
Complete Question paper with Marking Scheme
Combined
Oxford Cambridge and RSA
Friday 13 June 2025 – Morning
GCSE (9–1) Combined Science A (Gateway Science)
J250/10 Chemistry (Higher Tier)
Time allowed: 1 hour 10 minutes
You must have:
• a ruler (cm/mm)
H
• the Data Sheet for GCSE (9–1) Combined
Science A (Chemistry) (inside this
document)
You can use:
• a scientific or graphical calculator
• an HB pencil
* J 2 5 01 0 *
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 60.
• 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 24 pages.
, ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 OCR is an exempt
[601/8687/2] DC Charity Turn over
(WW/CB)
351886/4
,
, 2
Section A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
1 The equation shows a reaction that has reached dynamic equilibrium.
N2(g) + 3H2(g) 2NH3(g)
Which statement explains why this reaction is a dynamic equilibrium?
A N2 and H2 are gases.
B The rates of the forward and reverse reactions are equal.
C The reaction has stopped.
D The reaction produces a 100% yield of NH3.
Your answer [1]
© OCR 2025
