OCR GCSE Combined Science B Twenty First Century Science J260-04 Combined Science 2025 Comprehensive Revision Guide 2025/ 2026

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OCR GCSE
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B J260-04
(Twenty
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First
Combined
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J260-04
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2025 OCR GCSE Combined Science B (Twenty First Century Science)
J260/04 Combined Science (Foundation Tier)
Complete Question paper with Marking Scheme Combined

Oxford Cambridge and RSA


Monday 9 June 2025 – Morning
GCSE (9–1) Combined Science B
(Twenty First Century Science)
J260/04 Combined Science (Foundation Tier)
Time allowed: 1 hour 45 minutes

You must have:
• a ruler (cm/mm)
• the Data and Equation Sheet for GCSE (9–1)
F
Combined Science B (inside this document)
You can use:
• an HB pencil
• a scientific or graphical calcul


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 75.
• 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 28 pages.

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




© OCR 2025 [601/8690/2] OCR is an exempt Charity
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mbined
OCR GCSE
Science
2025
Combined
OCR
B (Twenty
GCSE
Science
First
Combined
Century
B (Twenty
Science
Science)
First Century
B J260-04
(Twenty
Science)
First
Combined
Century
J260-04
Science
Science)
Combined
(Foundation
J260-04
Science
Combined
Tier)
(Foundation
Complete
Science
Question
Tier)
(Foundation
Complete
paper Question
with
Tier)Marking
Complete
paper
Scheme
Question
with Marking
Combined.docx
paper
Scheme
with Marking
CombineSc

,mbined
OCR GCSE
Science
2025
Combined
OCR
B (Twenty
GCSE
Science
First
Combined
Century
B (Twenty
Science
Science)
First Century
B J260-04
(Twenty
Science)
First
Combined
Century
J260-04
Science
Science)
Combined
(Foundation
J260-04
Science
Combined
Tier)
(Foundation
Complete
Science
Question
Tier)
(Foundation
Complete
paper Question
with
Tier)Marking
Complete
paper
Scheme
Question
with Marking
Combined.docx
paper
Scheme
with Marking
CombineSc



2
1 This question is about acids and metals.

(a) This is the symbol equation for the reaction between magnesium, and hydrochloric acid:

Mg(s) + 2HCl(aq) MgCl2(aq) + H2(g)

(i) Which gas is made when magnesium reacts with hydrochloric acid?

Tick (✓) one box.

Carbon dioxide

Hydrogen

Oxygen

Steam
[1]

(ii) Which salt is made when magnesium reacts with hydrochloric acid?

Tick (✓) one box.

Magnesium carbonate

Magnesium chloride

Magnesium hydroxide

Magnesium oxide
[1]

(iii) Complete the sentences to describe how magnesium bonds with chlorine.

Use words from the list.

gaining ions losing molecules polymers sharing


Each Mg atom becomes Mg2+ by .................................two electrons.

Each Cl atom becomes Cl – by ................................. one electron.

The new particles formed, Mg2+ and Cl –, are called ................................ .
[3]




© OCR 2025




mbined
OCR GCSE
Science
2025
Combined
OCR
B (Twenty
GCSE
Science
First
Combined
Century
B (Twenty
Science
Science)
First Century
B J260-04
(Twenty
Science)
First
Combined
Century
J260-04
Science
Science)
Combined
(Foundation
J260-04
Science
Combined
Tier)
(Foundation
Complete
Science
Question
Tier)
(Foundation
Complete
paper Question
with
Tier)Marking
Complete
paper
Scheme
Question
with Marking
Combined.docx
paper
Scheme
with Marking
CombineSc

,mbined
OCR GCSE
Science
2025
Combined
OCR
B (Twenty
GCSE
Science
First
Combined
Century
B (Twenty
Science
Science)
First Century
B J260-04
(Twenty
Science)
First
Combined
Century
J260-04
Science
Science)
Combined
(Foundation
J260-04
Science
Combined
Tier)
(Foundation
Complete
Science
Question
Tier)
(Foundation
Complete
paper Question
with
Tier)Marking
Complete
paper
Scheme
Question
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3
(b)
(i) Hydrochloric acid is made by dissolving hydrogen chloride in water.

What forms when acids dissolve in water?

Tick (✓) one box.

Cl –

Cl +

H–

H+
[1]

(ii) The list shows the order of reactivity of some elements from most reactive to least reactive.

Most – Rubidium
Potassium
Magnesium
Aluminium
Carbon
Zinc
Iron
Least – Copper


Why is magnesium extracted by electrolysis and not by reaction with carbon?

..........................................................................................................................................................

. ................................................................................................................................................. [1]




© OCR 2025 Turn over



mbined
OCR GCSE
Science
2025
Combined
OCR
B (Twenty
GCSE
Science
First
Combined
Century
B (Twenty
Science
Science)
First Century
B J260-04
(Twenty
Science)
First
Combined
Century
J260-04
Science
Science)
Combined
(Foundation
J260-04
Science
Combined
Tier)
(Foundation
Complete
Science
Question
Tier)
(Foundation
Complete
paper Question
with
Tier)Marking
Complete
paper
Scheme
Question
with Marking
Combined.docx
paper
Scheme
with Marking
CombineSc

,mbined
OCR GCSE
Science
2025
Combined
OCR
B (Twenty
GCSE
Science
First
Combined
Century
B (Twenty
Science
Science)
First Century
B J260-04
(Twenty
Science)
First
Combined
Century
J260-04
Science
Science)
Combined
(Foundation
J260-04
Science
Combined
Tier)
(Foundation
Complete
Science
Question
Tier)
(Foundation
Complete
paper Question
with
Tier)Marking
Complete
paper
Scheme
Question
with Marking
Combined.docx
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4
(c) A student investigates the reaction between magnesium and different concentrations of
hydrochloric acid.

The student times how long it takes to collect 50 cm3 of gas.

The results are shown in the table:

Concentration of hydrochloric acid Time taken
(mol / dm3) (s)
0.2 60
0.4 30
0.6 10
0.8 5.0
1.0 2.5


(i) Plot the results from the table on the graph.

Three points have already been plotted. [1]

(ii) Draw a curve of best fit on the graph. [1]

60




50




40




Time taken (s) 30




20




10



0
0 0.2 0.4 0.6 0.8 1.0
3
Concentration of hydrochloric acid (mol / dm )

© OCR 2025




mbined
OCR GCSE
Science
2025
Combined
OCR
B (Twenty
GCSE
Science
First
Combined
Century
B (Twenty
Science
Science)
First Century
B J260-04
(Twenty
Science)
First
Combined
Century
J260-04
Science
Science)
Combined
(Foundation
J260-04
Science
Combined
Tier)
(Foundation
Complete
Science
Question
Tier)
(Foundation
Complete
paper Question
with
Tier)Marking
Complete
paper
Scheme
Question
with Marking
Combined.docx
paper
Scheme
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