Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
351–360 of 785
Question 351
2 marks · Easy
Answer and see the solution →Explain why alkenes burn to produce carbon dioxide and water when heated in oxygen.
Question 352
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 353
1 mark · Easy
Answer and see the solution →State the main type of bond found between carbon atoms in alkenes.
Question 354
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 355
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 356
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 357
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 358
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 359
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.
Question 360
4 marks · Normal
Answer and see the solution →A student compares the combustion reactions of three alkenes. The table shows the number of carbon and hydrogen atoms in each.
Alkene Number of carbon atoms (n) Number of hydrogen atoms Ethene 2 4 Propene 3 6 Pentene 5 10 (a)[1 mark]State the general formula for alkenes.
(b)[2 marks]Explain the pattern between the number of carbon atoms and hydrogen atoms in these alkenes.
(c)[1 mark]Write the molecular formula for hexene.