Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alkenes
106 practice questions
Topics covered
Practice questions
41–50 of 106
Question 41
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 42
2 marks · Easy
Answer and see the solution →Explain why alkenes burn to produce carbon dioxide and water when heated in oxygen.
Question 43
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 44
1 mark · Easy
Answer and see the solution →State the main type of bond found between carbon atoms in alkenes.
Question 45
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 46
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 47
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 48
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.
Question 49
3 marks · Normal
Answer and see the solution →An alkene has 8 carbon atoms in its molecule.
Calculate the number of hydrogen atoms present in one molecule of this alkene. Show your working.
Question 50
3 marks · Normal
Answer and see the solution →Alkenes are described as unsaturated hydrocarbons.
Explain what 'unsaturated' means and how you can test for unsaturation using a chemical reaction.