OCR 2024 GCSE Chemistry B (Twenty First Century Science) J258/04 Depth in Chemistry (Higher Tier) With Marking Scheme Merged
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Course
OCR 2024 GCSE Chemistry B
Institution
OCR 2024 GCSE Chemistry B
GCSE (9–1) Chemistry B (Twenty First Century Science)
J258/04 Depth in Chemistry (Higher Tier)
Time allowed: 1 hour 45 minutes
You must have: H • a ruler (cm/mm)
• the Data Sheet for GCSE (9–1) Chemistry B
(inside this document) ...
OCR 2024
GCSE Chemistry B (Twenty First Century Science)
J258/04 Depth in Chemistry (Higher Tier)
With Marking Scheme Merged
, Oxford Cambridge and RSA
Tuesday 11 June 2024 – Morning
GCSE (9–1) Chemistry B (Twenty First Century Science)
J258/04 Depth in Chemistry (Higher 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)
You can use:
H
• 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 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 32 pages.
ADVICE
• Read each question carefully before you start your answer.
, 2
1 Millions of tonnes of carbon dioxide (CO2) are added to the air in the UK every year.
Carbon dioxide is produced when fossil fuels are burned in power stations to generate electricity.
(a) Schemes are being developed to remove carbon dioxide from power station waste gases. These
schemes add to the cost of electricity.
Explain why it is important to remove carbon dioxide, despite the cost.
(b) The UK government says that the mass of carbon dioxide added to the air during the year 2020
decreased by 400 million tonnes compared to 1990. This is a decrease of 49%.
Calculate the mass of carbon dioxide added to the air during 1990.
decrease in mass
Use the formula: percentage decrease = mass added to the air during 1990 × 100
Mass added to the air during 1990 = .................................. million tonnes [3]
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