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OCR 2024 GCSE (9–1) Chemistry B (Twenty First Century Science) J258/04 Depth in Chemistry (Higher Tier) Question Paper and Mark Scheme Merged£6.15
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OCR 2024 GCSE (9–1) Chemistry B (Twenty First Century Science) J258/04 Depth in
Chemistry (Higher Tier) Question Paper and Mark Scheme Merged
@ Click2distinction
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Oxford Cambridge and RSA
OCR 2024 GCSE (9–1) Chemistry B (Twenty First Century Science) J258/04 Depth in
Chemistry (Higher Tier) Question Paper and Mark Scheme Merged
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
Contents:
Question Paper
Data Sheet
Mark Scheme
,
, 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 = × 100
mass added to the air during 1990
Mass added to the air during 1990 = ....................................million tonnes [3]
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