Monday 19 May 2025 – Morning
GCSE (9−1) Chemistry B (Twenty First Century Science)
J258/01 Breadth in Chemistry (Foundation Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Chemistry B
(inside this document)
F
You can use:
• a scientific or graphical calculator
• an HB pencil
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 page 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 [ ].
• This document has 32 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR GCSE Chemistry B (Twenty First Century Science)
(J258/01) Breadth in Chemistry (Foundation Tier) Question Paper
and Mark Scheme summer 2025
, 2
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR 2025
, 3
1 Greenhouse gases absorb energy emitted by the Earth.
(a) Carbon dioxide is a greenhouse gas.
(i) Which of these gases is another greenhouse gas?
Tick (✓) one box.
Methane
Nitrogen
Oxygen
[1]
(ii) Which two statements describe the possible effects of increased levels of greenhouse gases?
Tick (✓) two boxes.
Decreased algae growth in water.
Flooding of low land.
Increased oxygen in the atmosphere.
Melting of polar ice caps.
[2]
(iii) Suggest two ways the amount of carbon dioxide in the environment can be reduced.
1 .......................................................................................................................................................
..........................................................................................................................................................
2 .......................................................................................................................................................
..........................................................................................................................................................
[2]
© OCR 2025 Turn over
, 4
(b) The concentration of carbon dioxide in the atmosphere has increased over time.
Fig. 1.1 shows the concentration of carbon dioxide in the atmosphere over a 50-year period.
Fig. 1.1
440
420
400
380
Concentration
(ppm) 360
340
320
300
280
1960 1970 1980 1990 2000 2010
Year
Fig. 1.2 shows the number of cars being used in the USA over the same 50-year period.
Fig. 1.2
300
250
200
Number of 150
cars (millions)
100
50
0
1960 1970 1980 1990 2000 2010
Year
© OCR 2025
GCSE (9−1) Chemistry B (Twenty First Century Science)
J258/01 Breadth in Chemistry (Foundation Tier)
Time allowed: 1 hour 45 minutes
You must have:
• a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Chemistry B
(inside this document)
F
You can use:
• a scientific or graphical calculator
• an HB pencil
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 page 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 [ ].
• This document has 32 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR GCSE Chemistry B (Twenty First Century Science)
(J258/01) Breadth in Chemistry (Foundation Tier) Question Paper
and Mark Scheme summer 2025
, 2
BLANK PAGE
DO NOT WRITE ON THIS PAGE
© OCR 2025
, 3
1 Greenhouse gases absorb energy emitted by the Earth.
(a) Carbon dioxide is a greenhouse gas.
(i) Which of these gases is another greenhouse gas?
Tick (✓) one box.
Methane
Nitrogen
Oxygen
[1]
(ii) Which two statements describe the possible effects of increased levels of greenhouse gases?
Tick (✓) two boxes.
Decreased algae growth in water.
Flooding of low land.
Increased oxygen in the atmosphere.
Melting of polar ice caps.
[2]
(iii) Suggest two ways the amount of carbon dioxide in the environment can be reduced.
1 .......................................................................................................................................................
..........................................................................................................................................................
2 .......................................................................................................................................................
..........................................................................................................................................................
[2]
© OCR 2025 Turn over
, 4
(b) The concentration of carbon dioxide in the atmosphere has increased over time.
Fig. 1.1 shows the concentration of carbon dioxide in the atmosphere over a 50-year period.
Fig. 1.1
440
420
400
380
Concentration
(ppm) 360
340
320
300
280
1960 1970 1980 1990 2000 2010
Year
Fig. 1.2 shows the number of cars being used in the USA over the same 50-year period.
Fig. 1.2
300
250
200
Number of 150
cars (millions)
100
50
0
1960 1970 1980 1990 2000 2010
Year
© OCR 2025
