*1896511478*
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] DC (CE/SW) 353481/5
OCR is an exempt Charity
Turn over
1 In the 1800s, Dalton did experiments to help produce a model for the atom.
, 2
(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.
(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] (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.
© OCR 2025
, 3
Number of times bigger = .........................................................
(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] 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 =
m
a
s
s
o
f
o
r
e
Give your answer to 3 significant figures.
© OCR 2025 Turn over
, 4
Mass of ore = ..................................................... kg
(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 ........................................................................................................................
...................
........................................................................................................................................
..................
(c) Many metals cannot be extracted using carbon.
Explain why zinc can be extracted using carbon but aluminium cannot.
Zinc ................................................................................................................................
..................
........................................................................................................................................
..................
Aluminium ......................................................................................................................
..................
........................................................................................................................................
..................
[2] 3 Drinking water in the UK can be obtained from rivers. Rivers are a type of
surface water.
(a) Surface water contains impurities. The table shows some stages of the treatment to
make surface water more suitable for drinking.
(i) Complete the table to show which impurities are removed and how these impurities
are removed at each stage shown.
Stage Impurities removed How the impurities are removed
Screening
Leaves, branches, rubbish.
(pass the water through
a wide mesh) ..........................................................
© OCR 2025
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] DC (CE/SW) 353481/5
OCR is an exempt Charity
Turn over
1 In the 1800s, Dalton did experiments to help produce a model for the atom.
, 2
(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.
(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] (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.
© OCR 2025
, 3
Number of times bigger = .........................................................
(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] 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 =
m
a
s
s
o
f
o
r
e
Give your answer to 3 significant figures.
© OCR 2025 Turn over
, 4
Mass of ore = ..................................................... kg
(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 ........................................................................................................................
...................
........................................................................................................................................
..................
(c) Many metals cannot be extracted using carbon.
Explain why zinc can be extracted using carbon but aluminium cannot.
Zinc ................................................................................................................................
..................
........................................................................................................................................
..................
Aluminium ......................................................................................................................
..................
........................................................................................................................................
..................
[2] 3 Drinking water in the UK can be obtained from rivers. Rivers are a type of
surface water.
(a) Surface water contains impurities. The table shows some stages of the treatment to
make surface water more suitable for drinking.
(i) Complete the table to show which impurities are removed and how these impurities
are removed at each stage shown.
Stage Impurities removed How the impurities are removed
Screening
Leaves, branches, rubbish.
(pass the water through
a wide mesh) ..........................................................
© OCR 2025
