This question is about the Earth's atmosphere. Carbon dioxide is a greenhouse gas. What is another greenhouse gas? Tick one box. Argon Methane Nitrogen Oxygen Greenhouse gases cause global climate change. Give two effects of global climate change. 1 2 4.1 kg of a plastic, used to make plastic bottles, has a carbon footprint of 6.0 kg of carbon dioxide. Calculate the carbon footprint of one plastic bottle of mass 23.5 g. Carbon footprint = kg of carbon dioxide Give one way that carbon dioxide emissions can be reduced when a plastic bottle is manufactured. Explain how the percentages of nitrogen, oxygen and carbon dioxide in the Earth’s atmosphere today have changed from the Earth’s early atmosphere.

This question is about the Earth's atmosphere - AQA - GCSE Chemistry Combined Science - Question 2 - 2018 - Paper 2

Question 2

This question is about the Earth's atmosphere. Carbon dioxide is a greenhouse gas. What is another greenhouse gas? Tick one box. Argon Methane Nitrogen Oxygen... show full transcript

Worked Solution & Example Answer:This question is about the Earth's atmosphere - AQA - GCSE Chemistry Combined Science - Question 2 - 2018 - Paper 2

Step 1

What is another greenhouse gas?

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Answer

Another greenhouse gas is methane.

Step 2

Give two effects of global climate change.

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Answer

Rising sea levels.
Melting ice caps.

Step 3

Calculate the carbon footprint of one plastic bottle of mass 23.5 g.

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Answer

To find the carbon footprint of one plastic bottle, we can use the following formula:

$ext{Carbon footprint} = rac{6.0 ext{ kg}}{4.1 ext{ kg}} imes 23.5 ext{ g}$

Calculating gives:

$ext{Carbon footprint} ext{ of one bottle} = 0.0344 ext{ kg} ext{ of carbon dioxide}$

Step 4

Give one way that carbon dioxide emissions can be reduced when a plastic bottle is manufactured.

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Answer

One way to reduce carbon dioxide emissions is to use less plastic.

Step 5

Explain how the percentages of nitrogen, oxygen and carbon dioxide in the Earth’s atmosphere today have changed from the Earth’s early atmosphere.

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Answer

Changes in Atmospheric Composition

Nitrogen

The percentage of nitrogen has increased due to volcanic activity that produced nitrogen gas.
Also, bacteria in the soil converted ammonia into nitrogen.

Oxygen

The oxygen percentage has increased significantly because of photosynthesis carried out by algae and plants.

Carbon Dioxide

The amount of carbon dioxide has decreased over time as it was absorbed by oceans and other sinks.
Additionally, the formation of fossil fuels (crude oil/natural gas) from ancient biomass reduced carbon dioxide levels.

This question is about the Earth's atmosphere - AQA - GCSE Chemistry Combined Science - Question 2 - 2018 - Paper 2

Worked Solution & Example Answer:This question is about the Earth's atmosphere - AQA - GCSE Chemistry Combined Science - Question 2 - 2018 - Paper 2

What is another greenhouse gas?

Give two effects of global climate change.

Calculate the carbon footprint of one plastic bottle of mass 23.5 g.

Give one way that carbon dioxide emissions can be reduced when a plastic bottle is manufactured.

Explain how the percentages of nitrogen, oxygen and carbon dioxide in the Earth’s atmosphere today have changed from the Earth’s early atmosphere.

Changes in Atmospheric Composition

Nitrogen

Oxygen

Carbon Dioxide

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