Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alkenes
106 practice questions
Topics covered
Practice questions
1–10 of 44 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State the molecular formula of a branched isomer of butene.
Question 2
3 marks · Easy
Answer and see the solution →(a)[1 mark]Name the alkene with three carbon atoms.
(b)[1 mark]Draw the displayed formula of this alkene.
(c)[1 mark]Write the molecular formula of this alkene.
Question 3
2 marks · Easy
Answer and see the solution →An alkene contains 5 carbon atoms per molecule. Calculate the number of hydrogen atoms in a molecule of this alkene.
Question 4
2 marks · Easy
Answer and see the solution →Explain why butene (C4H8) can exist as several different structural isomers.
Question 5
3 marks · Easy
Answer and see the solution →Some alkenes and their number of hydrogen atoms Name Number of carbon atoms Number of hydrogen atoms Ethene 2 4 Propene 3 6 Butene 4 8 (a)[1 mark]State the general formula for alkenes.
(b)[1 mark]Complete the table for pentene.
(c)[1 mark]Explain the pattern in the number of hydrogen atoms as the number of carbon atoms increases in alkenes.
Question 6
1 mark · Easy
Answer and see the solution →State what feature of alkenes makes them unsaturated hydrocarbons.
Question 7
3 marks · Easy
Answer and see the solution →(a)[2 marks]Draw the displayed formula of a straight-chain isomer of butene where the double bond is between the second and third carbon atoms.
(b)[1 mark]Name this isomer.
Question 8
2 marks · Easy
Answer and see the solution →Calculate the molecular formula of the alkene with 6 carbon atoms.
Question 9
1 mark · Easy
Answer and see the solution →State the general formula for alkenes.
Question 10
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe the physical state of ethene, propene and butene at room temperature.
(b)[2 marks]Explain how the boiling points of these alkenes change as the number of carbon atoms increases.