Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alkanes
18 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →The molecular formula for an alkane with 16 carbon atoms is C₁₆H₃₄. State the general formula for alkanes. Using this formula, explain how you can determine the number of hydrogen atoms in any unbranched alkane.
Question 2
5 marks · Hard
Answer and see the solution →This question is about unbranched alkanes.
(a)[2 marks]Draw the displayed (structural) formula of the straight-chain alkane with eight carbon atoms.
(b)[1 mark]Write the name of this alkane.
(c)[1 mark]State the molecular formula for this compound.
(d)[1 mark]How many single carbon–carbon bonds are present in one unbranched molecule of this alkane? Show your reasoning.
Question 3
2 marks · Hard
Answer and see the solution →Butane reacts with bromine in the presence of ultraviolet light. Write a balanced chemical equation for the mono-substitution reaction of butane with bromine. Name the type of reaction and describe briefly what happens during this reaction.