Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alkanes
18 practice questions
Practice questions
1–10 of 18
Question 1
1 mark · Easy
Answer and see the solution →State the type of reaction that takes place when methane reacts with chlorine in the presence of ultraviolet light.
Question 2
3 marks · Easy
Answer and see the solution →The following questions are about the alkanes.
(a)[1 mark]State the general formula of alkanes.
(b)[1 mark]What does the letter 'n' represent in the general formula ?
(c)[1 mark]Using the general formula, give the molecular formula for an alkane with 7 carbon atoms.
Question 3
2 marks · Easy
Answer and see the solution →Draw the displayed (structural) formula of an unbranched alkane with 3 carbon atoms. State the name of this alkane.
Question 4
2 marks · Easy
Answer and see the solution →Explain why the reaction between propane and chlorine in ultraviolet light is called a substitution reaction. Use a chemical equation to support your answer.
Question 5
1 mark · Easy
Answer and see the solution →State the general formula for alkanes.
Question 6
3 marks · Easy
Answer and see the solution →This question is about the unbranched alkane with seven carbon atoms.
(a)[1 mark]Write the name of this alkane.
(b)[1 mark]Give its molecular formula.
(c)[1 mark]Draw its displayed (structural) formula.
Question 7
2 marks · Easy
Answer and see the solution →Pentane () reacts with bromine in ultraviolet light.
(a)[1 mark]Write a balanced chemical equation for the mono-substitution reaction between pentane and bromine.
(b)[1 mark]Name the organic product formed.
Question 8
2 marks · Normal
Answer and see the solution →State the general formula of alkanes and explain what this formula represents.
Question 9
4 marks · Normal
Answer and see the solution →The alkane with six carbon atoms is called hexane.
(a)[1 mark]Write the molecular formula for hexane.
(b)[2 marks]Draw the displayed (structural) formula of hexane.
(c)[1 mark]Give the name of the alkane with three carbon atoms in a straight chain.
Question 10
3 marks · Normal
Answer and see the solution →Octane (C8H18) can undergo substitution with chlorine in the presence of UV light.
Write the balanced chemical equation for the mono-substitution reaction of octane with chlorine. Give the formulae for all reactants and products. Calculate the total number of hydrogen atoms remaining in all the organic product molecules if 5 moles of octane completely undergo mono-substitution.