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This apparatus was used to find the percentage of oxygen in a sample of air - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1

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This apparatus was used to find the percentage of oxygen in a sample of air. Dry air was passed backwards and forwards over the hot copper. The copper turned black.... show full transcript

Worked Solution & Example Answer:This apparatus was used to find the percentage of oxygen in a sample of air - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1

Step 1

Explain why the volume of gas in the apparatus had decreased.

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Answer

The volume of gas in the apparatus decreased because the copper reacted with the oxygen present in the air. During this reaction, copper combines with oxygen to form copper oxide, which reduces the amount of free oxygen in the gas mixture, leading to a decrease in volume.

Step 2

Complete the sentence by putting a cross in the box next to your answer.

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Answer

C 21

Step 3

Which of these gases was present in large amounts in the Earth's earliest atmosphere?

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Answer

C ammonia

Step 4

Explain what happened to cause the percentage of water vapour in the Earth's atmosphere to decrease.

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Answer

The percentage of water vapour in the Earth's atmosphere decreased due to cooling of the atmosphere over time. As the Earth cooled, water vapour condensed to form liquid water, leading to the formation of oceans. This reduced the amount of water vapour in the atmosphere.

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