Oxford Cambridge and RSA
Examinations Higher GCSECombined
Science Chemistry A Gateway
ScienceJ250/10: Paper 10 (Higher Tier)
General Certificate of Secondary
Education with 100% correct marking
scheme
, Oxford Cambridge and RSA
Tuesday 13 June 2023 – Morning
GCSE (9–1) Combined Science (Chemistry) A
(Gateway Science)
J250/10 Paper 10 (Higher Tier)
H
Time allowed: 1 hour 10 minutes
* 9 1 3 3 6 6 7 5 8 6 *
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Combined Science
(Chemistry) A (inside this document)
You can use:
• a scientific or graphical calculator
• an HB pencil * J 2 5 0 1 0 *
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 24 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2023 [601/8687/2] OCR is an exempt Charity
DC (CE/CT) 301055/7 Turn over
, 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 reactions can be catalysed by an enzyme?
A Combustion reactions
B Electrolysis of metal ores
C Reactions in biological systems
D Reactions of metals with acids
Your answer [1]
2 Which row correctly describes the Group 0 elements?
Physical state at 25 °C Reactivity
A gas very reactive
B gas very unreactive
C liquid very reactive
D liquid very unreactive
Your answer [1]
© OCR 2023
, 3
3 A small piece of a Group 1 metal is added to a trough of water.
The metal floats, fizzes vigorously and melts to form a silvery ball.
Which Group 1 metal was added to the water?
A Lithium
B Potassium
C Rubidium
D Sodium
Your answer [1]
4 The equation shows a reaction of decane, C10H22, when it is heated with a catalyst.
C10H22 → C5H12 + C3H6 + C2H4
What is the name of this process?
A Cracking
B Displacement
C Electrolysis
D Reduction
Your answer [1]
© OCR 2023 Turn over
Examinations Higher GCSECombined
Science Chemistry A Gateway
ScienceJ250/10: Paper 10 (Higher Tier)
General Certificate of Secondary
Education with 100% correct marking
scheme
, Oxford Cambridge and RSA
Tuesday 13 June 2023 – Morning
GCSE (9–1) Combined Science (Chemistry) A
(Gateway Science)
J250/10 Paper 10 (Higher Tier)
H
Time allowed: 1 hour 10 minutes
* 9 1 3 3 6 6 7 5 8 6 *
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Combined Science
(Chemistry) A (inside this document)
You can use:
• a scientific or graphical calculator
• an HB pencil * J 2 5 0 1 0 *
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 24 pages.
ADVICE
• Read each question carefully before you start your answer.
© OCR 2023 [601/8687/2] OCR is an exempt Charity
DC (CE/CT) 301055/7 Turn over
, 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 reactions can be catalysed by an enzyme?
A Combustion reactions
B Electrolysis of metal ores
C Reactions in biological systems
D Reactions of metals with acids
Your answer [1]
2 Which row correctly describes the Group 0 elements?
Physical state at 25 °C Reactivity
A gas very reactive
B gas very unreactive
C liquid very reactive
D liquid very unreactive
Your answer [1]
© OCR 2023
, 3
3 A small piece of a Group 1 metal is added to a trough of water.
The metal floats, fizzes vigorously and melts to form a silvery ball.
Which Group 1 metal was added to the water?
A Lithium
B Potassium
C Rubidium
D Sodium
Your answer [1]
4 The equation shows a reaction of decane, C10H22, when it is heated with a catalyst.
C10H22 → C5H12 + C3H6 + C2H4
What is the name of this process?
A Cracking
B Displacement
C Electrolysis
D Reduction
Your answer [1]
© OCR 2023 Turn over
