Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Chemical reactions of the alkenes
19 practice questions
Practice questions
1–10 of 19
Question 1
1 mark · Easy
Answer and see the solution →State the general formula for alkenes.
Question 2
3 marks · Easy
Answer and see the solution →(a)[1 mark]State what is meant by an addition reaction of an alkene.
(b)[1 mark]Write the word equation for the reaction between ethene and bromine.
(c)[1 mark]What structural feature of ethene allows it to take part in addition reactions?
Question 3
2 marks · Easy
Answer and see the solution →An alkene has 15 carbon atoms in its molecule. Calculate the number of hydrogen atoms in one molecule of this alkene. Show your working.
Question 4
2 marks · Easy
Answer and see the solution →Explain why alkenes burn to produce carbon dioxide and water when heated in oxygen.
Question 5
3 marks · Easy
Answer and see the solution →Reactions of Different Alkenes Alkene Number of Carbon Atoms Number of Hydrogen Atoms Can undergo addition reaction? (Yes/No) Butene 4 8 Yes Hexene 6 12 Yes Nonene 9 18 Yes (a)[1 mark]Based on the table, state the general relationship between the number of carbon and hydrogen atoms in these alkenes.
(b)[1 mark]Explain why all three alkenes shown can undergo addition reactions.
(c)[1 mark]Predict the number of hydrogen atoms in a molecule of pentene.
Question 6
1 mark · Easy
Answer and see the solution →State the main type of bond found between carbon atoms in alkenes.
Question 7
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe what happens to the double bond in an alkene during an addition reaction.
(b)[1 mark]Name one substance that can react with an alkene in an addition reaction.
(c)[1 mark]State one product formed when ethene reacts with steam in an addition reaction.
Question 8
2 marks · Easy
Answer and see the solution →A molecule of heptene contains 14 hydrogen atoms. Calculate the number of carbon atoms in a molecule of heptene. Show your working.
Question 9
2 marks · Normal
Answer and see the solution →State the type of chemical reaction that occurs when ethene reacts completely with oxygen. Write the names of the two products formed in this reaction.
Question 10
4 marks · Normal
Answer and see the solution →Butene (C4H8) is an alkene that can undergo combustion and addition reactions.
(a)[2 marks]Write the balanced chemical equation for the complete combustion of butene (C4H8) in oxygen.
(b)[2 marks]Describe what happens to the C=C double bond when butene reacts with bromine, Br2.