OCR GCSE
OCR GCSE
(9–1)
OCR GCSE
(9–1)
Chemistry
(9–1)
Chemistry
A (Gateway
Chemistry
A (Gateway
Science)
A (Gateway
Science)
J248-03
Science)
J248-03
Higher
J248-03
Higher
Tier –
Higher
Tier
May–
2025
Tier
May–
Morning
2025
MayMorning
2025
Question
Morning
Question
Paper
Question
&
Paper
Marking
&
Paper
Marking
Scheme.pdf
& Marking
Scheme.pdf
Scheme.pdf
E (9?1) Official
2025/2026Page
UK.EDU.OCR
Question Paper
1GCSE
of 58with
Package
Complete
DealMarking
| Complete
Scheme,
ExamAnswers,
Questionand
Papers
Step-by-Step
with Marking
Solutions
Schemes,
for Exam
Foundation
Practice
& and
Higher
Revision?Page
Tier Bundle 1
2025 OCR GCSE Chemistry A (Gateway Science)
J248/03 (Higher Tier)
Complete Question paper with Marking Scheme Combined
Monday 19 May 2025 – Morning
GCSE (9–1) Chemistry A (Gateway Science)
J248/03 (Higher Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Chemistry A
(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 90.
• 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 32 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/8663/X] OCR is an exempt Charity
DC (DE/SW) 353817/6 Turn over
1?OCRPage
GCSE12025
(9?1) Official Question Paper with Complete Marking Scheme, Answers, and Step-by-Step Solutions for Exam Practice and Revision?
OCR GCSE
OCR GCSE
(9–1)
OCR
(9–1)
Chemistry
GCSEChemistry
(9–1)
A (Gateway
Chemistry
A (Gateway
Science)
A Science)
(Gateway
J248-03J248-03
Science)
Higher Higher
Tier
J248-03
–Tier
May
Higher
–
2025
May
Tier
Morning
2025
– Morning
May
Question
2025Question
Morning
Paper &
Paper
Question
Marking
& Marking
Scheme.pdf
Paper &
Scheme.pdf
Marking Scheme
, OCR GCSE
OCR GCSE
(9–1)
OCR GCSE
(9–1)
Chemistry
(9–1)
Chemistry
A (Gateway
Chemistry
A (Gateway
Science)
A (Gateway
Science)
J248-03
Science)
J248-03
Higher
J248-03
Higher
Tier –
Higher
Tier
May–
2025
Tier
May–
Morning
2025
MayMorning
2025
Question
Morning
Question
Paper
Question
&
Paper
Marking
&
Paper
Marking
Scheme.pdf
& Marking
Scheme.pdf
Scheme.pdf
E (9?1) Official
2025/2026Page
UK.EDU.OCR
Question Paper
2GCSE
of 58with
Package
Complete
DealMarking
| Complete
Scheme,
ExamAnswers,
Questionand
Papers
Step-by-Step
with Marking
Solutions
Schemes,
for Exam
Foundation
Practice
& and
Higher
Revision?Page
Tier Bundle 2
2
Section A
You should spend a maximum of 30 minutes on this section.
Write your answer to each question in the box provided.
1 How many covalent bonds can a carbon atom form?
A 2
B 4
C 6
D 8
Your answer [1]
2 What is the ionic equation for neutralisation?
A H– + OH+ H2O
B H+ + OH– H2O
C 2H2 + 2O2– 2H2O
D H+ + O2 HO2
Your answer [1]
© OCR 2025
2?OCRPage
GCSE22025
(9?1) Official Question Paper with Complete Marking Scheme, Answers, and Step-by-Step Solutions for Exam Practice and Revision?
OCR GCSE
OCR GCSE
(9–1)
OCR
(9–1)
Chemistry
GCSEChemistry
(9–1)
A (Gateway
Chemistry
A (Gateway
Science)
A Science)
(Gateway
J248-03J248-03
Science)
Higher Higher
Tier
J248-03
–Tier
May
Higher
–
2025
May
Tier
Morning
2025
– Morning
May
Question
2025Question
Morning
Paper &
Paper
Question
Marking
& Marking
Scheme.pdf
Paper &
Scheme.pdf
Marking Scheme
, OCR GCSE
OCR GCSE
(9–1)
OCR GCSE
(9–1)
Chemistry
(9–1)
Chemistry
A (Gateway
Chemistry
A (Gateway
Science)
A (Gateway
Science)
J248-03
Science)
J248-03
Higher
J248-03
Higher
Tier –
Higher
Tier
May–
2025
Tier
May–
Morning
2025
MayMorning
2025
Question
Morning
Question
Paper
Question
&
Paper
Marking
&
Paper
Marking
Scheme.pdf
& Marking
Scheme.pdf
Scheme.pdf
E (9?1) Official
2025/2026Page
UK.EDU.OCR
Question Paper
3GCSE
of 58with
Package
Complete
DealMarking
| Complete
Scheme,
ExamAnswers,
Questionand
Papers
Step-by-Step
with Marking
Solutions
Schemes,
for Exam
Foundation
Practice
& and
Higher
Revision?Page
Tier Bundle 3
3
3 Which atomic model was developed by Thomson?
A
+ –
+ – ++
B – + –
+– –
+
C
D
Your answer [1]
4 The diagram shows calcium carbonate, CaCO3, reacting with an acid.
The equation for the reaction is:
CaCO3(s) + 2HCl (aq) CaCl2(aq) + H2O(l) + CO2(g)
What happens to the mass displayed on the balance as the reaction progresses?
A Decreases
B Decreases then increases
C Increases
D Stays the same
Your answer [1]
© OCR 2025 Turn over
3?OCRPage
GCSE32025
(9?1) Official Question Paper with Complete Marking Scheme, Answers, and Step-by-Step Solutions for Exam Practice and Revision?
OCR GCSE
OCR GCSE
(9–1)
OCR
(9–1)
Chemistry
GCSEChemistry
(9–1)
A (Gateway
Chemistry
A (Gateway
Science)
A Science)
(Gateway
J248-03J248-03
Science)
Higher Higher
Tier
J248-03
–Tier
May
Higher
–
2025
May
Tier
Morning
2025
– Morning
May
Question
2025Question
Morning
Paper &
Paper
Question
Marking
& Marking
Scheme.pdf
Paper &
Scheme.pdf
Marking Scheme
, OCR GCSE
OCR GCSE
(9–1)
OCR GCSE
(9–1)
Chemistry
(9–1)
Chemistry
A (Gateway
Chemistry
A (Gateway
Science)
A (Gateway
Science)
J248-03
Science)
J248-03
Higher
J248-03
Higher
Tier –
Higher
Tier
May–
2025
Tier
May–
Morning
2025
MayMorning
2025
Question
Morning
Question
Paper
Question
&
Paper
Marking
&
Paper
Marking
Scheme.pdf
& Marking
Scheme.pdf
Scheme.pdf
E (9?1) Official
2025/2026Page
UK.EDU.OCR
Question Paper
4GCSE
of 58with
Package
Complete
DealMarking
| Complete
Scheme,
ExamAnswers,
Questionand
Papers
Step-by-Step
with Marking
Solutions
Schemes,
for Exam
Foundation
Practice
& and
Higher
Revision?Page
Tier Bundle 4
4
5 Which ion do solutions of all alkalis contain?
A K+
B H+
C OH–
D SO42–
Your answer [1]
6 What is the relative formula mass of butanoic acid, C3H7COOH?
Relative atomic mass (Ar): C = 12.0 H = 1.0 O = 16.0
A 29.0
B 44.0
C 88.0
D 120.0
Your answer [1]
7 What type of bonding is found in all polymers?
A Covalent
B Electrostatic
C Ionic
D Metallic
Your answer [1]
© OCR 2025
4?OCRPage
GCSE42025
(9?1) Official Question Paper with Complete Marking Scheme, Answers, and Step-by-Step Solutions for Exam Practice and Revision?
OCR GCSE
OCR GCSE
(9–1)
OCR
(9–1)
Chemistry
GCSEChemistry
(9–1)
A (Gateway
Chemistry
A (Gateway
Science)
A Science)
(Gateway
J248-03J248-03
Science)
Higher Higher
Tier
J248-03
–Tier
May
Higher
–
2025
May
Tier
Morning
2025
– Morning
May
Question
2025Question
Morning
Paper &
Paper
Question
Marking
& Marking
Scheme.pdf
Paper &
Scheme.pdf
Marking Scheme
OCR GCSE
(9–1)
OCR GCSE
(9–1)
Chemistry
(9–1)
Chemistry
A (Gateway
Chemistry
A (Gateway
Science)
A (Gateway
Science)
J248-03
Science)
J248-03
Higher
J248-03
Higher
Tier –
Higher
Tier
May–
2025
Tier
May–
Morning
2025
MayMorning
2025
Question
Morning
Question
Paper
Question
&
Paper
Marking
&
Paper
Marking
Scheme.pdf
& Marking
Scheme.pdf
Scheme.pdf
E (9?1) Official
2025/2026Page
UK.EDU.OCR
Question Paper
1GCSE
of 58with
Package
Complete
DealMarking
| Complete
Scheme,
ExamAnswers,
Questionand
Papers
Step-by-Step
with Marking
Solutions
Schemes,
for Exam
Foundation
Practice
& and
Higher
Revision?Page
Tier Bundle 1
2025 OCR GCSE Chemistry A (Gateway Science)
J248/03 (Higher Tier)
Complete Question paper with Marking Scheme Combined
Monday 19 May 2025 – Morning
GCSE (9–1) Chemistry A (Gateway Science)
J248/03 (Higher Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Chemistry A
(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 90.
• 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 32 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2025 [601/8663/X] OCR is an exempt Charity
DC (DE/SW) 353817/6 Turn over
1?OCRPage
GCSE12025
(9?1) Official Question Paper with Complete Marking Scheme, Answers, and Step-by-Step Solutions for Exam Practice and Revision?
OCR GCSE
OCR GCSE
(9–1)
OCR
(9–1)
Chemistry
GCSEChemistry
(9–1)
A (Gateway
Chemistry
A (Gateway
Science)
A Science)
(Gateway
J248-03J248-03
Science)
Higher Higher
Tier
J248-03
–Tier
May
Higher
–
2025
May
Tier
Morning
2025
– Morning
May
Question
2025Question
Morning
Paper &
Paper
Question
Marking
& Marking
Scheme.pdf
Paper &
Scheme.pdf
Marking Scheme
, OCR GCSE
OCR GCSE
(9–1)
OCR GCSE
(9–1)
Chemistry
(9–1)
Chemistry
A (Gateway
Chemistry
A (Gateway
Science)
A (Gateway
Science)
J248-03
Science)
J248-03
Higher
J248-03
Higher
Tier –
Higher
Tier
May–
2025
Tier
May–
Morning
2025
MayMorning
2025
Question
Morning
Question
Paper
Question
&
Paper
Marking
&
Paper
Marking
Scheme.pdf
& Marking
Scheme.pdf
Scheme.pdf
E (9?1) Official
2025/2026Page
UK.EDU.OCR
Question Paper
2GCSE
of 58with
Package
Complete
DealMarking
| Complete
Scheme,
ExamAnswers,
Questionand
Papers
Step-by-Step
with Marking
Solutions
Schemes,
for Exam
Foundation
Practice
& and
Higher
Revision?Page
Tier Bundle 2
2
Section A
You should spend a maximum of 30 minutes on this section.
Write your answer to each question in the box provided.
1 How many covalent bonds can a carbon atom form?
A 2
B 4
C 6
D 8
Your answer [1]
2 What is the ionic equation for neutralisation?
A H– + OH+ H2O
B H+ + OH– H2O
C 2H2 + 2O2– 2H2O
D H+ + O2 HO2
Your answer [1]
© OCR 2025
2?OCRPage
GCSE22025
(9?1) Official Question Paper with Complete Marking Scheme, Answers, and Step-by-Step Solutions for Exam Practice and Revision?
OCR GCSE
OCR GCSE
(9–1)
OCR
(9–1)
Chemistry
GCSEChemistry
(9–1)
A (Gateway
Chemistry
A (Gateway
Science)
A Science)
(Gateway
J248-03J248-03
Science)
Higher Higher
Tier
J248-03
–Tier
May
Higher
–
2025
May
Tier
Morning
2025
– Morning
May
Question
2025Question
Morning
Paper &
Paper
Question
Marking
& Marking
Scheme.pdf
Paper &
Scheme.pdf
Marking Scheme
, OCR GCSE
OCR GCSE
(9–1)
OCR GCSE
(9–1)
Chemistry
(9–1)
Chemistry
A (Gateway
Chemistry
A (Gateway
Science)
A (Gateway
Science)
J248-03
Science)
J248-03
Higher
J248-03
Higher
Tier –
Higher
Tier
May–
2025
Tier
May–
Morning
2025
MayMorning
2025
Question
Morning
Question
Paper
Question
&
Paper
Marking
&
Paper
Marking
Scheme.pdf
& Marking
Scheme.pdf
Scheme.pdf
E (9?1) Official
2025/2026Page
UK.EDU.OCR
Question Paper
3GCSE
of 58with
Package
Complete
DealMarking
| Complete
Scheme,
ExamAnswers,
Questionand
Papers
Step-by-Step
with Marking
Solutions
Schemes,
for Exam
Foundation
Practice
& and
Higher
Revision?Page
Tier Bundle 3
3
3 Which atomic model was developed by Thomson?
A
+ –
+ – ++
B – + –
+– –
+
C
D
Your answer [1]
4 The diagram shows calcium carbonate, CaCO3, reacting with an acid.
The equation for the reaction is:
CaCO3(s) + 2HCl (aq) CaCl2(aq) + H2O(l) + CO2(g)
What happens to the mass displayed on the balance as the reaction progresses?
A Decreases
B Decreases then increases
C Increases
D Stays the same
Your answer [1]
© OCR 2025 Turn over
3?OCRPage
GCSE32025
(9?1) Official Question Paper with Complete Marking Scheme, Answers, and Step-by-Step Solutions for Exam Practice and Revision?
OCR GCSE
OCR GCSE
(9–1)
OCR
(9–1)
Chemistry
GCSEChemistry
(9–1)
A (Gateway
Chemistry
A (Gateway
Science)
A Science)
(Gateway
J248-03J248-03
Science)
Higher Higher
Tier
J248-03
–Tier
May
Higher
–
2025
May
Tier
Morning
2025
– Morning
May
Question
2025Question
Morning
Paper &
Paper
Question
Marking
& Marking
Scheme.pdf
Paper &
Scheme.pdf
Marking Scheme
, OCR GCSE
OCR GCSE
(9–1)
OCR GCSE
(9–1)
Chemistry
(9–1)
Chemistry
A (Gateway
Chemistry
A (Gateway
Science)
A (Gateway
Science)
J248-03
Science)
J248-03
Higher
J248-03
Higher
Tier –
Higher
Tier
May–
2025
Tier
May–
Morning
2025
MayMorning
2025
Question
Morning
Question
Paper
Question
&
Paper
Marking
&
Paper
Marking
Scheme.pdf
& Marking
Scheme.pdf
Scheme.pdf
E (9?1) Official
2025/2026Page
UK.EDU.OCR
Question Paper
4GCSE
of 58with
Package
Complete
DealMarking
| Complete
Scheme,
ExamAnswers,
Questionand
Papers
Step-by-Step
with Marking
Solutions
Schemes,
for Exam
Foundation
Practice
& and
Higher
Revision?Page
Tier Bundle 4
4
5 Which ion do solutions of all alkalis contain?
A K+
B H+
C OH–
D SO42–
Your answer [1]
6 What is the relative formula mass of butanoic acid, C3H7COOH?
Relative atomic mass (Ar): C = 12.0 H = 1.0 O = 16.0
A 29.0
B 44.0
C 88.0
D 120.0
Your answer [1]
7 What type of bonding is found in all polymers?
A Covalent
B Electrostatic
C Ionic
D Metallic
Your answer [1]
© OCR 2025
4?OCRPage
GCSE42025
(9?1) Official Question Paper with Complete Marking Scheme, Answers, and Step-by-Step Solutions for Exam Practice and Revision?
OCR GCSE
OCR GCSE
(9–1)
OCR
(9–1)
Chemistry
GCSEChemistry
(9–1)
A (Gateway
Chemistry
A (Gateway
Science)
A Science)
(Gateway
J248-03J248-03
Science)
Higher Higher
Tier
J248-03
–Tier
May
Higher
–
2025
May
Tier
Morning
2025
– Morning
May
Question
2025Question
Morning
Paper &
Paper
Question
Marking
& Marking
Scheme.pdf
Paper &
Scheme.pdf
Marking Scheme
