GCSE 2025
Chemistry A Gateway Science
J248/03: Paper 3 (Higher Tier)
*1374577712*
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 28 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2024 [601/8663/X] DC (CJ/FC) 339903/6
OCR is an exempt Charity
Turn over
Section A
You should spend a maximum of 30 minutes on this section.
Write your answer to each question in the box provided.
1 Which property is characteristic of a metal?
A It forms acidic oxides.
B It is brittle.
C It is malleable.
D It reacts with acid to form carbon dioxide gas.
Your answer
, 2
2 Graphite and graphene are allotropes of carbon.
Which statement is correct about graphite and graphene?
A Graphite has delocalised electrons, graphene uses all electrons in bonding.
B Graphite has four bonds from each carbon atom, graphene only has three.
C Graphite is a giant covalent structure, graphene is not.
D Graphite is made up of layers, graphene is a single layer.
Your answer
3 A lithium ion is Li+ and a phosphate ion is PO43 –.
What is the formula of lithium phosphate?
A Li(PO4)3
B Li2PO4
C Li2(PO4)3
D Li3PO4
Your answer [1] 4 Which statement about a reducing agent is correct?
A It oxidises another species and is itself oxidised.
B It oxidises another species and is itself reduced.
C It reduces another species and is itself oxidised.
D It reduces another species and is itself reduced.
Your answer
5 Which statement about alkalis is correct?
A They form H+ ions in solution.
B They have a pH value greater than 7.
C They react with metals to form a salt and hydrogen.
D They turn universal indicator red.
© OCR 2024
, 3
Your answer
6 Which equipment is needed to set up an electrolysis experiment?
A A battery, a beaker, a funnel and wires
B A battery, a beaker, electrodes and wires
C A battery, crocodile clips, electrodes and a thermometer
D A beaker, electrodes, a funnel and a thermometer
Your answer [1] 7 Which products are formed in the electrolysis of
sodium chloride solution?
Anode Cathode
A chlorine hydrogen
B chlorine sodium
C oxygen hydrogen
D oxygen sodium
Your answer
8 How did Mendeleev group elements together to develop his Periodic Table?
A Based on chemical properties and left gaps
B Based on mass number and atomic number
C Based on physical properties and atomic number
D Based on physical properties and left gaps
Your answer
9 What is the mass of one atom of beryllium, Be?
Relative atomic mass (Ar): Be = 9.0.
The Avogadro constant is 6.02 × 1023.
A 6.64 × 10–24 g
B 1.50 × 10–23 g
© OCR 2024 Turn over
, 4
C 2.41 × 10 g 24
D 5.42 × 1024 g
Your answer [1] 10 Zinc reacts with iron chloride to form zinc chloride and
iron.
Zn + FeCl 2 ZnCl 2 + Fe
What is the balanced ionic equation for this reaction?
A Zn + Fe+ Zn+ + Fe
B Zn + Zn2+ Fe2+ + Fe
+
C Zn + Zn 2Fe 2+
+ 2Fe
2+
D 2Zn + Fe 2Zn+ + Fe
Your answer
11 Molten aluminium oxide, Al 2O3, is electrolysed.
Which row of the table shows the reactions at the electrodes?
Cathode Anode
A Al 3+
+ 3e– Al O2– O2 + 2e–
B Al 3+
Al + 3e– O2– + 2e– O2
C Al 3+
+ 3e– Al 2O2– O2 + 4e–
D Al 3+
Al + 3e– 2O2– + 4e– O2
Your answer
12 An element has the electronic configuration 2.8.4.
Which group and period is the element in?
A Group 2 as it has 2 electron shells. Period 4 as it has 4 electrons in the outer
shell.
B Group 2 as it has 2 electrons in the outer shell. Period 4 as it has 4 electron
shells.
C Group 4 as it has 4 electron shells. Period 3 as it has 3 electrons in the outer
shell.
© OCR 2024
Chemistry A Gateway Science
J248/03: Paper 3 (Higher Tier)
*1374577712*
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 28 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2024 [601/8663/X] DC (CJ/FC) 339903/6
OCR is an exempt Charity
Turn over
Section A
You should spend a maximum of 30 minutes on this section.
Write your answer to each question in the box provided.
1 Which property is characteristic of a metal?
A It forms acidic oxides.
B It is brittle.
C It is malleable.
D It reacts with acid to form carbon dioxide gas.
Your answer
, 2
2 Graphite and graphene are allotropes of carbon.
Which statement is correct about graphite and graphene?
A Graphite has delocalised electrons, graphene uses all electrons in bonding.
B Graphite has four bonds from each carbon atom, graphene only has three.
C Graphite is a giant covalent structure, graphene is not.
D Graphite is made up of layers, graphene is a single layer.
Your answer
3 A lithium ion is Li+ and a phosphate ion is PO43 –.
What is the formula of lithium phosphate?
A Li(PO4)3
B Li2PO4
C Li2(PO4)3
D Li3PO4
Your answer [1] 4 Which statement about a reducing agent is correct?
A It oxidises another species and is itself oxidised.
B It oxidises another species and is itself reduced.
C It reduces another species and is itself oxidised.
D It reduces another species and is itself reduced.
Your answer
5 Which statement about alkalis is correct?
A They form H+ ions in solution.
B They have a pH value greater than 7.
C They react with metals to form a salt and hydrogen.
D They turn universal indicator red.
© OCR 2024
, 3
Your answer
6 Which equipment is needed to set up an electrolysis experiment?
A A battery, a beaker, a funnel and wires
B A battery, a beaker, electrodes and wires
C A battery, crocodile clips, electrodes and a thermometer
D A beaker, electrodes, a funnel and a thermometer
Your answer [1] 7 Which products are formed in the electrolysis of
sodium chloride solution?
Anode Cathode
A chlorine hydrogen
B chlorine sodium
C oxygen hydrogen
D oxygen sodium
Your answer
8 How did Mendeleev group elements together to develop his Periodic Table?
A Based on chemical properties and left gaps
B Based on mass number and atomic number
C Based on physical properties and atomic number
D Based on physical properties and left gaps
Your answer
9 What is the mass of one atom of beryllium, Be?
Relative atomic mass (Ar): Be = 9.0.
The Avogadro constant is 6.02 × 1023.
A 6.64 × 10–24 g
B 1.50 × 10–23 g
© OCR 2024 Turn over
, 4
C 2.41 × 10 g 24
D 5.42 × 1024 g
Your answer [1] 10 Zinc reacts with iron chloride to form zinc chloride and
iron.
Zn + FeCl 2 ZnCl 2 + Fe
What is the balanced ionic equation for this reaction?
A Zn + Fe+ Zn+ + Fe
B Zn + Zn2+ Fe2+ + Fe
+
C Zn + Zn 2Fe 2+
+ 2Fe
2+
D 2Zn + Fe 2Zn+ + Fe
Your answer
11 Molten aluminium oxide, Al 2O3, is electrolysed.
Which row of the table shows the reactions at the electrodes?
Cathode Anode
A Al 3+
+ 3e– Al O2– O2 + 2e–
B Al 3+
Al + 3e– O2– + 2e– O2
C Al 3+
+ 3e– Al 2O2– O2 + 4e–
D Al 3+
Al + 3e– 2O2– + 4e– O2
Your answer
12 An element has the electronic configuration 2.8.4.
Which group and period is the element in?
A Group 2 as it has 2 electron shells. Period 4 as it has 4 electrons in the outer
shell.
B Group 2 as it has 2 electrons in the outer shell. Period 4 as it has 4 electron
shells.
C Group 4 as it has 4 electron shells. Period 3 as it has 3 electrons in the outer
shell.
© OCR 2024
