Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The combustion of elements in oxygen
18 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
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 2
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 3
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.