GCSE Chemistry A OCR J248/03 Chemistry Higher Tier chemistry exam paper Gateway Science chemistry atomic structure bonding quantitative chemistry rates of reaction equilibrium chemical analysis Earth’s resources exam paper with mark scheme sc

20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx




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




20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx

,20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx



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




20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx

,20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx



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



20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx

, 20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx



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




20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx
20251202204345_692f4f81d5320_ngcr__76_.docx