GCSE Edexcel Chemistry Identifying gases: This apparatus was used to find

Question

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.
The apparatus was allowed to cool.
The volume of gas in the apparatus had decreased.

(i) Explain why the volume of gas has decreased.

(ii) Complete the sentence by putting a cross ⨁ in the box next to your answer.
The percentage of oxygen in dry air is

□ A 0.1
  □ B 1.0
  □ C 21
  □ D 79

(b) The composition of the Earth's earliest atmosphere was different to that of the present atmosphere.

(i) Which of these gases was present in large amounts in the Earth's earliest atmosphere?
Put a cross ⨁ in the box next to your answer.

□ A oxygen
  □ B carbon dioxide
  □ C ammonia
  □ D nitrogen

(ii) The Earth's early atmosphere contained a larger percentage of water vapour than the Earth's atmosphere today.
Explain what happened to cause the percentage of water vapour in the Earth's atmosphere to decrease.

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

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

Explain why the volume of gas has decreased.

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

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

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

Join the GCSE students using SimpleStudy...