OCR GCSE Combined Science A Gateway Science J250-10 Chemistry Higher Tier Complete Question Paper Comprehensive Revision Guide 2025/ 2026

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OCR GCSE Combined Science A Gateway Science J250-10 Chemistry Higher Tier Complete Question Paper Comprehensive Revision Guide 2025/ 2026

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Strengthen your OCR GCSE Combined Science A (Gateway Science) understanding with OCR GCSE Combined Science A J250-10 Chemistry Higher Tier Complete Question Paper Comprehensive Revision Guide 2025/ 2026 with solution. This academic resource covers Chemistry Higher Tier topics, including chemical reactions, structure and bonding, quantitative chemistry, energy changes, and the periodic table, with exam-style questions and mark scheme guidance to support revision and exam success.

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ombined
eway Science)
-OCR
Science
J250-10
GCSE
A (Gateway
Combined
Chemistry
Science)
Science
(Higher
J250-10
ATier)
(Gateway
Complete
Chemistry
Science)
Question
(Higher
J250-10
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperCombined
Complete
with Marking
Question
Friday
Scheme
13paper
June
Combined
with
2025Marking
â€“Friday
Morning
Scheme
13 GCSE
June
Combined
2025
(9â€“1).pdf
â€“Friday
Morning
13 GC
Ju
2025/2026Page
UK.EDU.OCR1GCSE
of 47 Package Deal | Complete Exam Question Papers with Marking Schemes, Foundation & Higher Tier Bundle
Page 1

2025 OCR GCSE Combined Science A (Gateway Science)
J250/10 Chemistry (Higher Tier)
Complete Question paper with Marking Scheme Combined

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)
• 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

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 [601/8687/2] OCR is an exempt Charity
DC (WW/CB) 351886/4 Turn over

Page 12025 1
ombined
eway Science)
-OCR
Science
J250-10
GCSE
A (Gateway
Combined
Chemistry
Science)
Science
(Higher
J250-10
ATier)
(Gateway
Complete
Chemistry
Science)
Question
(Higher
J250-10
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperCombined
Complete
with Marking
Question
Friday
Scheme
13paper
June
Combined
with
2025Marking
â€“Friday
Morning
Scheme
13 GCSE
June
Combined
2025
(9â€“1).pdf
â€“Friday
Morning
13 GC
Ju

,ombined
eway Science)
-OCR
Science
J250-10
GCSE
A (Gateway
Combined
Chemistry
Science)
Science
(Higher
J250-10
ATier)
(Gateway
Complete
Chemistry
Science)
Question
(Higher
J250-10
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperCombined
Complete
with Marking
Question
Friday
Scheme
13paper
June
Combined
with
2025Marking
â€“Friday
Morning
Scheme
13 GCSE
June
Combined
2025
(9â€“1).pdf
â€“Friday
Morning
13 GC
Ju
2025/2026Page
UK.EDU.OCR2GCSE
of 47 Package Deal | Complete Exam Question Papers with Marking Schemes, Foundation & Higher Tier Bundle
Page 2

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

Page 22025 2
ombined
eway Science)
-OCR
Science
J250-10
GCSE
A (Gateway
Combined
Chemistry
Science)
Science
(Higher
J250-10
ATier)
(Gateway
Complete
Chemistry
Science)
Question
(Higher
J250-10
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperCombined
Complete
with Marking
Question
Friday
Scheme
13paper
June
Combined
with
2025Marking
â€“Friday
Morning
Scheme
13 GCSE
June
Combined
2025
(9â€“1).pdf
â€“Friday
Morning
13 GC
Ju

,ombined
eway Science)
-OCR
Science
J250-10
GCSE
A (Gateway
Combined
Chemistry
Science)
Science
(Higher
J250-10
ATier)
(Gateway
Complete
Chemistry
Science)
Question
(Higher
J250-10
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperCombined
Complete
with Marking
Question
Friday
Scheme
13paper
June
Combined
with
2025Marking
â€“Friday
Morning
Scheme
13 GCSE
June
Combined
2025
(9â€“1).pdf
â€“Friday
Morning
13 GC
Ju
2025/2026Page
UK.EDU.OCR3GCSE
of 47 Package Deal | Complete Exam Question Papers with Marking Schemes, Foundation & Higher Tier Bundle
Page 3

3
2 The graph shows the volume of gas produced during a reaction.

A tangent has been drawn at 50 seconds. The gradient of the tangent gives the rate of reaction.

100

90

80

70

60
70
3
Volume of gas (cm ) 50

40

30

20
100
10

0
0 50 100 150 200
Time (s)

What is the rate of reaction, in cm3 / s, at 50 seconds?

A 0.56

B 0.70

C 1.1

D 1.4

Your answer [1]

© OCR 2025 Turn over

Page 32025 3
ombined
eway Science)
-OCR
Science
J250-10
GCSE
A (Gateway
Combined
Chemistry
Science)
Science
(Higher
J250-10
ATier)
(Gateway
Complete
Chemistry
Science)
Question
(Higher
J250-10
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperCombined
Complete
with Marking
Question
Friday
Scheme
13paper
June
Combined
with
2025Marking
â€“Friday
Morning
Scheme
13 GCSE
June
Combined
2025
(9â€“1).pdf
â€“Friday
Morning
13 GC
Ju

,ombined
eway Science)
-OCR
Science
J250-10
GCSE
A (Gateway
Combined
Chemistry
Science)
Science
(Higher
J250-10
ATier)
(Gateway
Complete
Chemistry
Science)
Question
(Higher
J250-10
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperCombined
Complete
with Marking
Question
Friday
Scheme
13paper
June
Combined
with
2025Marking
â€“Friday
Morning
Scheme
13 GCSE
June
Combined
2025
(9â€“1).pdf
â€“Friday
Morning
13 GC
Ju
2025/2026Page
UK.EDU.OCR4GCSE
of 47 Package Deal | Complete Exam Question Papers with Marking Schemes, Foundation & Higher Tier Bundle
Page 4

4
3 What are the optimum reaction conditions for the cracking of hydrocarbons?

Temperature (°C) Catalyst
A 25 not used
B 25 alumina
C 650 alumina
D 650 not used

Your answer [1]

4 Why do reactions happen faster at higher temperatures?

A The activation energy increases.

B The particles are closer together.

C The particles collide with more energy.

D The size of the particles increases.

Your answer [1]

© OCR 2025

Page 42025 4
ombined
eway Science)
-OCR
Science
J250-10
GCSE
A (Gateway
Combined
Chemistry
Science)
Science
(Higher
J250-10
ATier)
(Gateway
Complete
Chemistry
Science)
Question
(Higher
J250-10
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperCombined
Complete
with Marking
Question
Friday
Scheme
13paper
June
Combined
with
2025Marking
â€“Friday
Morning
Scheme
13 GCSE
June
Combined
2025
(9â€“1).pdf
â€“Friday
Morning
13 GC
Ju

Document information

Study: GCSE
School year: 1
Uploaded on: May 30, 2026
Number of pages: 47
Written in: 2025/2026
Type: Exam (elaborations)
Contains: Questions & answers

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