plumiWhat is the evidence for climate change, why is it occurring?: OCR GCSE Chemistry B questions
Every OCR GCSE Chemistry B exam question on C1.3 What is the evidence for climate change, why is it occurring?, 2018–2025, with its mark scheme and examiner’s report.
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All 61 questions on What is the evidence for climate change, why is it occurring?, as a list
- June 2025, Paper 1 Foundation, Q1(a)(i) (1 mark): Which of these gases is another greenhouse gas? Tick (✓) one box. Methane Nitrogen Oxygen [1]
- June 2025, Paper 1 Foundation, Q1(a)(ii) (2 marks): Which two statements describe the possible effects of increased levels of greenhouse gases? Tick (✓) two boxes. Decreased algae growth in water. Flooding of low
- June 2025, Paper 1 Foundation, Q1(a)(iii) (2 marks): Suggest two ways the amount of carbon dioxide in the environment can be reduced. 1 2 [2]
- June 2025, Paper 1 Foundation, Q1(b)(i) (1 mark): Explain how the graphs shown in Fig. 1.1 and Fig. 1.2 show that there is a correlation between the number of cars being used and the concentration of carbon dio
- June 2025, Paper 1 Foundation, Q1(b)(ii) (2 marks): Calculate the increase in concentration of carbon dioxide in the atmosphere between 1960 and 2010. Use Fig. 1.1. Increase in concentration of carbon dioxide = p
- June 2025, Paper 3 Higher, Q6(b)(i) (3 marks): Which statements about greenhouse gases are true and which are false? Tick (✓) one box in each row. True False They absorb infrared radiation from the Earth. Th
- June 2025, Paper 3 Higher, Q6(b)(ii) (2 marks): Increased carbon dioxide and methane cause climate change. State two possible consequences of climate change. 1 2 [2]
- June 2025, Paper 4 Higher, Q6(a) (3 marks): Burning hydrogen has a different impact on the Earth’s climate to burning methanol. Explain why. [3]
- June 2024, Paper 1 Foundation, Q5(b)(i) (2 marks): Describe the pattern in changes to the amount of sulfur dioxide emissions from cars from 1970 to 2020. [2]
- June 2024, Paper 1 Foundation, Q5(b)(ii) (1 mark): Which year was the most sulfur dioxide released? [1]
- June 2024, Paper 1 Foundation, Q5(b)(iii) (1 mark): State one environmental problem caused by an increase in the amount of sulfur dioxide. [1]
- June 2024, Paper 1 Foundation, Q5(b)(iv) (1 mark): State one method used to reduce the amount of sulfur dioxide emissions from cars. [1]
- June 2024, Paper 2 Foundation, Q10(a) (3 marks): 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 t
- June 2024, Paper 2 Foundation, Q10(b) (3 marks): 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 decreas
- June 2024, Paper 2 Foundation, Q10(c)(i) (1 mark): Which is the best estimate of the amount of carbon dioxide that can be stored in UK oil fields? Tick (3) one box. < 2.3 × 103 million tonnes > 2.3 × 104 million
- June 2024, Paper 2 Foundation, Q10(c)(ii) (1 mark): The demand for energy for electricity is one factor that affects the amount of fossil fuels we burn. State one other factor that affects the amount of fossil fu
- June 2024, Paper 4 Higher, Q1(a) (3 marks): 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 t
- June 2024, Paper 4 Higher, Q1(b) (3 marks): 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 decreas
- June 2024, Paper 4 Higher, Q1(c)(i) (1 mark): Which is the best estimate of the amount of carbon dioxide that can be stored in UK oil fields? Tick (3) one box. < 2.3 × 103 million tonnes > 2.3 × 104 million
- June 2024, Paper 4 Higher, Q1(c)(ii) (1 mark): The demand for energy for electricity is one factor that affects the amount of fossil fuels we burn. State one other factor that affects the amount of fossil fu
- June 2023, Paper 1 Foundation, Q6(a) (1 mark): The statements describe the greenhouse effect. Write the numbers 2, 3, 4 to show the correct order of the greenhouse effect. One has already been done for you.
- June 2023, Paper 1 Foundation, Q6(b) (3 marks): Which statements about the greenhouse effect are true, and which are false? Tick (3) one box in each row. True False The proportion of greenhouse gases in the a
- June 2023, Paper 1 Foundation, Q7(a) (2 marks): Describe how nitrogen oxide is produced in a petrol engine. [2]
- June 2023, Paper 1 Foundation, Q7(b)(ii) (2 marks): Riley says that the catalytic converter removes all gases which can harm the environment. Explain why Riley is wrong. [2]
- June 2023, Paper 1 Foundation, Q7(c)(i) (3 marks): Give three conclusions you can make from the bar chart. 1. 2. 3. [3]
- June 2023, Paper 1 Foundation, Q7(c)(ii) (2 marks): Calculate the value of the ratio: CO produced by a car without a catalytic converter NO produced by a car without a catalytic converter [2] Ratio =
- June 2023, Paper 3 Higher, Q3(a) (3 marks): Casey thinks that the change in carbon dioxide concentration in the last 20 years is due to burning coal. Explain why Casey is wrong. Use evidence from both gra
- June 2023, Paper 3 Higher, Q3(b) (3 marks): The world’s usage of energy from fossil fuels in 2019 was approximately 135 000 × 1012 Wh. A solar panel generates 1350 kWh per year. Calculate the number of so
- June 2023, Paper 3 Higher, Q3(c) (3 marks): Gabi says that the concentration of carbon dioxide in 2020 has increased by approximately 50% since pre-industrial times. Explain why Gabi is correct. Use data
- June 2023, Paper 3 Higher, Q3(d)(i) (3 marks): Describe the greenhouse effect. [3]
- June 2023, Paper 3 Higher, Q3(d)(ii) (3 marks): Describe three potential effects of an increase in the greenhouse effect on the Earth’s climate. 1. 2. 3. [3]
- June 2023, Paper 3 Higher, Q8(a) (3 marks): Describe how each of these polluting gases is produced in a petrol engine. Carbon monoxide Nitrogen monoxide [3]
- June 2023, Paper 3 Higher, Q8(b) (2 marks): In a catalytic converter, nitrogen monoxide and carbon monoxide react to form carbon dioxide and nitrogen. Write the balanced symbol equation for this reaction.
- June 2023, Paper 3 Higher, Q8(c)(i) (2 marks): The concentrations of the two polluting gases are given in parts per million. Convert 9000 parts per million into a percentage (parts per hundred). Percentage =
- June 2023, Paper 3 Higher, Q8(c)(ii) (3 marks): Calculate the percentage reduction of nitrogen monoxide when a catalytic converter is used. Give your answer to 1 decimal place. Percentage reduction of nitroge
- June 2022, Paper 2 Foundation, Q7(d) (1 mark): Fig. 7.2 shows the amount of oil burned and the change in the Earth’s temperature between 1850 and 2010. Key: temperature oil Change Thousand million in Earth’s
- June 2022, Paper 2 Foundation, Q7(e) (2 marks): Some scientists fear that climate change may cause other long-term environmental problems. Describe two other long-term environmental problems caused by climate
- June 2022, Paper 4 Higher, Q3(b) (2 marks): Ben looks at the graph and says, ‘Carbon dioxide concentration was always much higher in the past than it is today.’ Does the graph support this statement? Tick
- June 2022, Paper 4 Higher, Q3(c) (2 marks): Scientists say that the concentration of carbon dioxide is now 0.04 %. In the year 2000 the concentration of carbon dioxide was 370 ppm (parts per million). Do
- June 2022, Paper 4 Higher, Q3(d) (1 mark): Some scientists fear that increased carbon dioxide in the air may lead to global food shortages. Explain why this could happen. [1]
- November 2020, Paper 1 Foundation, Q2(a)(i) (1 mark): Using Fig. 2.1, what was the temperature in 1910? Temperature = °C [1]
- November 2020, Paper 1 Foundation, Q2(a)(ii) (2 marks): Using Fig. 2.1, calculate the temperature rise between 1980 and 2000. Temperature rise = °C [2]
- November 2020, Paper 1 Foundation, Q2(a)(iii) (2 marks): Using Fig. 2.1, which two time periods show the greatest temperature rises? Tick (3) two boxes. 1890–1900 1910–1920 1920–1940 1980–2000 [2]
- November 2020, Paper 1 Foundation, Q2(b)(i) (1 mark): How do greenhouse gases increase world temperatures? Tick (3) one box. They block out visible light from the Sun. They form a cover around the Earth. They absor
- November 2020, Paper 1 Foundation, Q2(b)(ii) (2 marks): Carbon dioxide is a greenhouse gas. Draw lines to connect each question with one correct answer. Question Answer People burning more fossil fuels. What can dire
- November 2020, Paper 3 Higher, Q4(a)(i) (1 mark): Using Fig. 4.1, describe how the average world temperature changed from 1910–1930. [1]
- November 2020, Paper 3 Higher, Q4(a)(ii) (1 mark): Between which two years was there the largest continuous temperature rise? Between and [1]
- November 2020, Paper 3 Higher, Q4(b)(i) (2 marks): Some scientists believe that average world temperatures have increased due to increased amounts of greenhouse gases in the air. Carbon dioxide is a greenhouse g
- November 2020, Paper 3 Higher, Q4(b)(ii) (1 mark): State one suitable way in which we can lower our carbon dioxide emissions. [1]
- November 2020, Paper 3 Higher, Q4(c) (1 mark): State one effect of increasing average world temperatures on the Earth’s climate. [1]
- June 2019, Paper 2 Foundation, Q8(a)(i) (2 marks): Calculate the concentration of carbon dioxide, in ppb. 1% = 10 000 000 ppb (parts per billion) Concentration = ppb [2]
- June 2019, Paper 2 Foundation, Q8(a)(ii) (2 marks): Governments think that reducing emissions of carbon dioxide will have a bigger effect on the environment, than reducing emissions of the other gases. Use the da
- June 2019, Paper 2 Foundation, Q8(b)(i) (3 marks): Which statements about the data in Fig. 8.1 are true and which are false? Tick (✓) one box in each row. Statement True False For each gas the concentration rema
- June 2019, Paper 2 Foundation, Q8(b)(ii) (2 marks): Amir makes this comment about the graph. Amir There are general correlations on the graph but annual concentrations do not show close correlations. Do you agree
- June 2019, Paper 4 Higher, Q10(a)(i) (2 marks): Calculate the percentage of methane in the atmosphere. 1.0 ppb = 1.0 × 10–7% Methane = % [2]
- June 2019, Paper 4 Higher, Q10(a)(ii) (2 marks): Use your answer to (a)(i) to explain why governments are more concerned about carbon dioxide emissions than emissions of the other gases in the table. [2]
- June 2019, Paper 4 Higher, Q10(b) (6 marks): The first major agreement between countries was the 1997 Kyoto Protocol. This graph shows the concentration of some greenhouse gases in the atmosphere before th
- June 2018, Paper 1 Foundation, Q1(a) (1 mark): Carbon dioxide and water vapour are greenhouse gases. Which gas in the list below is also a greenhouse gas? Tick (3) one box. Hydrogen Methane Nitrogen Oxygen [
- June 2018, Paper 1 Foundation, Q1(b)(i) (1 mark): Describe how the Earth’s temperature has increased since 1952. [1]
- June 2018, Paper 1 Foundation, Q1(b)(ii) (1 mark): Roughly how many times greater was the temperature increase in 2002 compared to the temperature increase in 1962? Tick (3) one box. 0.6 1.2 12 60 [1]
- June 2018, Paper 1 Foundation, Q11(c) (2 marks): Diesel is a fossil fuel. Name two pollutants caused by the incomplete combustion of fossil fuels. 1 2 [2]
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