Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
31–40 of 136 · Hard
Question 31
5 marks · Hard
Answer and see the solution →The diagram below shows apparatus used to investigate the amount of oxygen in air using heated copper.
Apparatus for measuring oxygen in air with heated copper. Describe and explain how this experiment is carried out to determine the percentage of oxygen in air.
(a)[2 marks]State what change you would expect to see in the copper during the experiment, and explain your answer.
(b)[3 marks]Describe how you would use the readings from the gas syringes to calculate the percentage of oxygen in air. Include the calculation in your answer.
Question 32
2 marks · Hard
Answer and see the solution →Argon and carbon dioxide are both present in dry, unpolluted air. Which is present in a larger amount? Give an approximate percentage for both gases.
Question 33
2 marks · Hard
Answer and see the solution →Explain why a strip of iron wool burns more vigorously in pure oxygen than in air.
Question 34
5 marks · Hard
Answer and see the solution →Sodium and magnesium both burn in oxygen, forming new compounds. The reactions are more vigorous in pure oxygen than in air.
(a)[1 mark]Write a balanced chemical equation for the reaction of sodium with oxygen.
(b)[2 marks]Describe what you would observe when magnesium burns in pure oxygen.
(c)[2 marks]Explain, using ideas about the percentage of oxygen in air, why sodium and magnesium burn more vigorously in pure oxygen than in air.
Question 35
2 marks · Hard
Answer and see the solution →Describe what is meant by a combustion reaction, and give one example of such a reaction involving an element.
Question 36
2 marks · Hard
Answer and see the solution →Calcium reacts with oxygen to form calcium oxide. State whether calcium oxide is acidic, basic or neutral. Explain your answer.
Question 37
5 marks · Hard
Answer and see the solution →This question is about the nature of oxides.
(a)[2 marks]Complete the table by identifying whether each oxide is acidic, basic or neutral.
Oxide Type (acidic, basic or neutral) Sodium oxide Carbon dioxide (b)[3 marks]Explain your answers for both oxides, referring to the type of element each oxide is formed from.
Question 38
2 marks · Hard
Answer and see the solution →When phosphorus is burned in oxygen, phosphorus(V) oxide is formed. State whether phosphorus(V) oxide is acidic, basic or neutral. Give a reason for your answer.
Question 39
2 marks · Hard
Answer and see the solution →Explain two reasons why an increase in the concentration of carbon dioxide in the atmosphere could lead to changes in Earth's climate.
Question 40
5 marks · Hard
Answer and see the solution →A student heats a sample of iron(II) carbonate to investigate the formation of carbon dioxide gas.
(a)[2 marks]Write the balanced chemical equation, including state symbols, for the thermal decomposition of iron(II) carbonate.
(b)[1 mark]State the type of reaction taking place.
(c)[1 mark]Describe one observation the student would make as the reaction occurs.
(d)[1 mark]Name the gas formed in this reaction.