GCSE Combined Science OCR Gateway Science J250/03 Chemistry Foundation Tier chemistry exam paper GCSE chemistry revision states of matter atomic structure chemical reactions periodic table science assessment

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2025 OCR GCSE Combined Science A (Gateway Science)
J250/03 Chemistry (Foundation Tier)
Complete Question paper with Marking Scheme Combined




Monday 19 May 2025 – Morning
GCSE (9–1) Combined Science A
(Gateway Science)
J250/03 Chemistry (Foundation Tier)
Time allowed: 1 hour 10 minutes

You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Combined
F
Science A (Chemistry) (inside this document)
You can use:
• a scientific or graphical calculator
• an HB penci


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 20 pages.

ADVICE
• Read each question carefully before you start your answer.




© OCR 2025 [601/8687/2] OCR is an exempt Charity
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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 Which state of matter is shown in the diagram?




A A gas

B A liquid

C A solid

D A solution


Your answer [1]



2 24 g of magnesium reacts with oxygen to make 40 g of magnesium oxide.

What mass of magnesium oxide is made when 12 g of magnesium reacts?

A 20 g

B 24 g

C 36 g

D 40 g

Your answer [1]




© OCR 2025




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3
3 What type of change is shown in the diagram?


+


Iron Sulfur Iron sulfide

A A change of state

B A chemical change

C A physical change

D A reversible change


Your answer [1]



4 The diagram shows a chemical reaction.




Balance
g



Why does the mass on the balance decrease during the reaction?

A A gas is produced.

B A liquid is produced.

C A solid is produced.

D A solution is produced.

Your answer [1]




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4
5 Methane reacts with oxygen to make carbon dioxide and water.

CH4 + 2O2 CO2 + 2H2O

Which chemical is being oxidised?

A CH4

B CO2

C H2O

D O2

Your answer [1]


6 Which type of mixture can be separated using paper chromatography?

A A mixture of gases.

B A mixture of insoluble liquids.

C A mixture of insoluble solids.

D A mixture of soluble liquids.


Your answer [1]


7 Which particle in dilute hydrochloric acid, HCl, makes it acidic?

A Cl –

B H+

C H2O

D OH–

Your answer [1]




© OCR 2025




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