ETwenty
Combined
2025
First Science
Century
OCR GCSEB
Science)
(Twenty
Combined
J260-06
First Science
Century
Chemistry
B
Science)
(Twenty
(Higher
J260-06
First
Tier)
Century
Complete
Chemistry
Science)
Question
(Higher
J260-06
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperComplete
Combined.docx
with Marking
Question
Scheme
pap
2025 OCR GCSE Combined Science B (Twenty First Century Science)
J260/06 Chemistry (Higher Tier)
Complete Question paper with Marking Scheme Combined
Monday 19 May 2025 – Morning
GCSE (9–1) Combined Science B
(Twenty First Century Science)
J260/06 Chemistry (Higher Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Combined Science
(Chemistry) B (inside this document)
You can use:
• an HB pencil
• a scientific or graphical calculator
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 95.
• 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 [601/8690/2] OCR is an exempt Charity
DC (CE/SW) 353481/5 Turn over
E Combined
2025Science
OCR GCSE
B (Twenty
Combined
First Science
Century B
Science)
(TwentyJ260-06
First Century
Chemistry
Science)
(Higher
J260-06
Tier) Complete
ChemistryQuestion
(Higher4/13/2026,
Tier)
paperComplete
with
4:25:28
Marking
Question
PMScheme
pap
,ETwenty
Combined
2025
First Science
Century
OCR GCSEB
Science)
(Twenty
Combined
J260-06
First Science
Century
Chemistry
B
Science)
(Twenty
(Higher
J260-06
First
Tier)
Century
Complete
Chemistry
Science)
Question
(Higher
J260-06
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperComplete
Combined.docx
with Marking
Question
Scheme
pap
2
1 In the 1800s, Dalton did experiments to help produce a model for the atom.
(a) Later discoveries led to scientists suggesting new models for the atom.
Draw lines to connect each discovery with the model it led to.
Discovery Model
_
_
Electrons are discovered. _
_
_
+ −
− − +−
Electrons are in shells. + +− +
− +−
+ − +−
Nucleus is discovered.
[2]
(b) The modern model of the atom consists of electrons, neutrons and protons.
Which statements about the modern model of the atom are true and which are false?
Tick (✓) one box in each row.
True False
Neutrons have a charge of 0.
Protons and electrons are in the nucleus.
Protons and electrons have a relative charge of –1.
Protons and neutrons have a relative mass of 1.
[3]
© OCR 2025
E Combined
2025Science
OCR GCSE
B (Twenty
Combined
First Science
Century B
Science)
(TwentyJ260-06
First Century
Chemistry
Science)
(Higher
J260-06
Tier) Complete
ChemistryQuestion
(Higher4/13/2026,
Tier)
paperComplete
with
4:25:28
Marking
Question
PMScheme
pap
,ETwenty
Combined
2025
First Science
Century
OCR GCSEB
Science)
(Twenty
Combined
J260-06
First Science
Century
Chemistry
B
Science)
(Twenty
(Higher
J260-06
First
Tier)
Century
Complete
Chemistry
Science)
Question
(Higher
J260-06
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperComplete
Combined.docx
with Marking
Question
Scheme
pap
3
(c) The diameter of an atom is 1 × 10–10 m and the diameter of a nucleus is 1.7 × 10–15 m.
Estimate how many times bigger the atom is compared to the nucleus.
Number of times bigger = .......................................................... [2]
(d) The atomic number and mass number can be used to find the number of protons, neutrons and
electrons in an atom.
The table shows information about an argon atom and a potassium atom.
Complete the table.
Argon atom Potassium atom
Atomic number 18
......................
Mass number 40
......................
Number of electrons 19
......................
Number of neutrons 20
......................
Number of protons 19
......................
[4]
© OCR 2025 Turn over
E Combined
2025Science
OCR GCSE
B (Twenty
Combined
First Science
Century B
Science)
(TwentyJ260-06
First Century
Chemistry
Science)
(Higher
J260-06
Tier) Complete
ChemistryQuestion
(Higher4/13/2026,
Tier)
paperComplete
with
4:25:28
Marking
Question
PMScheme
pap
,ETwenty
Combined
2025
First Science
Century
OCR GCSEB
Science)
(Twenty
Combined
J260-06
First Science
Century
Chemistry
B
Science)
(Twenty
(Higher
J260-06
First
Tier)
Century
Complete
Chemistry
Science)
Question
(Higher
J260-06
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperComplete
Combined.docx
with Marking
Question
Scheme
pap
4
2 Zinc is extracted from its ore by separating the zinc compounds from the waste rock and then
converting the zinc compounds into zinc.
(a) A company wants to extract 5.5 kg of zinc from an ore which contains 8.5% zinc.
Calculate the mass of ore needed.
mass of zinc × 100
Use the equation: percentage of zinc in ore = mass of ore
Give your answer to 3 significant figures.
Mass of ore = ..................................................... kg [4]
(b) The zinc compounds are heated strongly to produce zinc oxide.
The zinc oxide is then heated with carbon to produce zinc and carbon monoxide.
ZnO + C Zn + CO
Explain which substance is oxidised and which is reduced in this reaction.
Oxidised ...........................................................................................................................................
..........................................................................................................................................................
Reduced ...........................................................................................................................................
..........................................................................................................................................................
[2]
(c) Many metals cannot be extracted using carbon.
Explain why zinc can be extracted using carbon but aluminium cannot.
Zinc ..................................................................................................................................................
..........................................................................................................................................................
Aluminium ........................................................................................................................................
..........................................................................................................................................................
[2]
© OCR 2025
E Combined
2025Science
OCR GCSE
B (Twenty
Combined
First Science
Century B
Science)
(TwentyJ260-06
First Century
Chemistry
Science)
(Higher
J260-06
Tier) Complete
ChemistryQuestion
(Higher4/13/2026,
Tier)
paperComplete
with
4:25:28
Marking
Question
PMScheme
pap
Combined
2025
First Science
Century
OCR GCSEB
Science)
(Twenty
Combined
J260-06
First Science
Century
Chemistry
B
Science)
(Twenty
(Higher
J260-06
First
Tier)
Century
Complete
Chemistry
Science)
Question
(Higher
J260-06
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperComplete
Combined.docx
with Marking
Question
Scheme
pap
2025 OCR GCSE Combined Science B (Twenty First Century Science)
J260/06 Chemistry (Higher Tier)
Complete Question paper with Marking Scheme Combined
Monday 19 May 2025 – Morning
GCSE (9–1) Combined Science B
(Twenty First Century Science)
J260/06 Chemistry (Higher Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Combined Science
(Chemistry) B (inside this document)
You can use:
• an HB pencil
• a scientific or graphical calculator
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 95.
• 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 [601/8690/2] OCR is an exempt Charity
DC (CE/SW) 353481/5 Turn over
E Combined
2025Science
OCR GCSE
B (Twenty
Combined
First Science
Century B
Science)
(TwentyJ260-06
First Century
Chemistry
Science)
(Higher
J260-06
Tier) Complete
ChemistryQuestion
(Higher4/13/2026,
Tier)
paperComplete
with
4:25:28
Marking
Question
PMScheme
pap
,ETwenty
Combined
2025
First Science
Century
OCR GCSEB
Science)
(Twenty
Combined
J260-06
First Science
Century
Chemistry
B
Science)
(Twenty
(Higher
J260-06
First
Tier)
Century
Complete
Chemistry
Science)
Question
(Higher
J260-06
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperComplete
Combined.docx
with Marking
Question
Scheme
pap
2
1 In the 1800s, Dalton did experiments to help produce a model for the atom.
(a) Later discoveries led to scientists suggesting new models for the atom.
Draw lines to connect each discovery with the model it led to.
Discovery Model
_
_
Electrons are discovered. _
_
_
+ −
− − +−
Electrons are in shells. + +− +
− +−
+ − +−
Nucleus is discovered.
[2]
(b) The modern model of the atom consists of electrons, neutrons and protons.
Which statements about the modern model of the atom are true and which are false?
Tick (✓) one box in each row.
True False
Neutrons have a charge of 0.
Protons and electrons are in the nucleus.
Protons and electrons have a relative charge of –1.
Protons and neutrons have a relative mass of 1.
[3]
© OCR 2025
E Combined
2025Science
OCR GCSE
B (Twenty
Combined
First Science
Century B
Science)
(TwentyJ260-06
First Century
Chemistry
Science)
(Higher
J260-06
Tier) Complete
ChemistryQuestion
(Higher4/13/2026,
Tier)
paperComplete
with
4:25:28
Marking
Question
PMScheme
pap
,ETwenty
Combined
2025
First Science
Century
OCR GCSEB
Science)
(Twenty
Combined
J260-06
First Science
Century
Chemistry
B
Science)
(Twenty
(Higher
J260-06
First
Tier)
Century
Complete
Chemistry
Science)
Question
(Higher
J260-06
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperComplete
Combined.docx
with Marking
Question
Scheme
pap
3
(c) The diameter of an atom is 1 × 10–10 m and the diameter of a nucleus is 1.7 × 10–15 m.
Estimate how many times bigger the atom is compared to the nucleus.
Number of times bigger = .......................................................... [2]
(d) The atomic number and mass number can be used to find the number of protons, neutrons and
electrons in an atom.
The table shows information about an argon atom and a potassium atom.
Complete the table.
Argon atom Potassium atom
Atomic number 18
......................
Mass number 40
......................
Number of electrons 19
......................
Number of neutrons 20
......................
Number of protons 19
......................
[4]
© OCR 2025 Turn over
E Combined
2025Science
OCR GCSE
B (Twenty
Combined
First Science
Century B
Science)
(TwentyJ260-06
First Century
Chemistry
Science)
(Higher
J260-06
Tier) Complete
ChemistryQuestion
(Higher4/13/2026,
Tier)
paperComplete
with
4:25:28
Marking
Question
PMScheme
pap
,ETwenty
Combined
2025
First Science
Century
OCR GCSEB
Science)
(Twenty
Combined
J260-06
First Science
Century
Chemistry
B
Science)
(Twenty
(Higher
J260-06
First
Tier)
Century
Complete
Chemistry
Science)
Question
(Higher
J260-06
Tier)
paperComplete
Chemistry
with Marking
Question
(Higher
Scheme
Tier)
paperComplete
Combined.docx
with Marking
Question
Scheme
pap
4
2 Zinc is extracted from its ore by separating the zinc compounds from the waste rock and then
converting the zinc compounds into zinc.
(a) A company wants to extract 5.5 kg of zinc from an ore which contains 8.5% zinc.
Calculate the mass of ore needed.
mass of zinc × 100
Use the equation: percentage of zinc in ore = mass of ore
Give your answer to 3 significant figures.
Mass of ore = ..................................................... kg [4]
(b) The zinc compounds are heated strongly to produce zinc oxide.
The zinc oxide is then heated with carbon to produce zinc and carbon monoxide.
ZnO + C Zn + CO
Explain which substance is oxidised and which is reduced in this reaction.
Oxidised ...........................................................................................................................................
..........................................................................................................................................................
Reduced ...........................................................................................................................................
..........................................................................................................................................................
[2]
(c) Many metals cannot be extracted using carbon.
Explain why zinc can be extracted using carbon but aluminium cannot.
Zinc ..................................................................................................................................................
..........................................................................................................................................................
Aluminium ........................................................................................................................................
..........................................................................................................................................................
[2]
© OCR 2025
E Combined
2025Science
OCR GCSE
B (Twenty
Combined
First Science
Century B
Science)
(TwentyJ260-06
First Century
Chemistry
Science)
(Higher
J260-06
Tier) Complete
ChemistryQuestion
(Higher4/13/2026,
Tier)
paperComplete
with
4:25:28
Marking
Question
PMScheme
pap
