Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Gases in the Atmosphere
86 practice questions
Topics covered
Practice questions
11–20 of 35 · Easy
Question 11
2 marks · Easy
Answer and see the solution →During the combustion of phosphorus in air, a student measures that the water level in the bell jar rises by 44 mL. The total original air volume in the jar was 210 mL. Calculate (to the nearest whole number) the percentage of oxygen in the original air sample.
Question 12
2 marks · Easy
Answer and see the solution →Explain why it is important to leave some phosphorus unreacted at the end of the experiment when finding the percentage of oxygen in air using phosphorus.
Question 13
1 mark · Easy
Answer and see the solution →State what you would observe when magnesium burns in pure oxygen.
Question 14
3 marks · Easy
Answer and see the solution →The diagram shows an experiment in which sulfur is burned in a bell jar filled with air over a trough of water.
(a)[1 mark]Describe what you would see when sulfur burns in oxygen.
(b)[1 mark]Write a word equation for the reaction of sulfur and oxygen.
(c)[1 mark]Explain why the water level inside the bell jar rises after burning sulfur, based on the changes taking place inside the jar.
Question 15
2 marks · Easy
Answer and see the solution →A student burns phosphorus in a bell jar containing 300 cm³ of air. After the reaction, the water level inside the bell jar rises by 63 cm³. Calculate the percentage of oxygen in air, based on these results. Give your answer to the nearest whole number.
Question 16
1 mark · Easy
Answer and see the solution →State whether sodium oxide is an acidic oxide or a basic oxide.
Question 17
3 marks · Easy
Answer and see the solution →The table shows information about two oxides.
(a)[1 mark]Name the type of element (metal or non-metal) that forms magnesium oxide.
(b)[1 mark]State whether magnesium oxide reacts with acids, with alkalis, or with both.
(c)[1 mark]Give the general property (acidic or basic) of non-metal oxides.
Question 18
2 marks · Easy
Answer and see the solution →Explain why carbon dioxide is classed as an acidic oxide. Give a reason for your answer.
Question 19
3 marks · Easy
Answer and see the solution →The table shows solutions formed by dissolving some oxides in water:
Solutions of different oxides Oxide Solution pH Aluminium oxide 7 Sulfur dioxide 3 Potassium oxide 13 (a)[1 mark]Which oxide forms a neutral solution? Give its pH.
(b)[1 mark]State whether sulfur dioxide is a metal oxide or a non-metal oxide.
(c)[1 mark]Explain why potassium oxide gives a pH of 13.
Question 20
1 mark · Easy
Answer and see the solution →Give an example of an acidic oxide.