Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
361–370 of 785
Question 361
1 mark · Normal
Answer and check →Which statement best describes an addition reaction of ethene?
- A.Two ethene molecules join together to form a longer chain.
- B.Ethene reacts with oxygen to form carbon dioxide and water.
- C.Bromine atoms add across the double bond of ethene.
- D.Hydrogen atoms are lost from ethene forming ethyne.
Question 362
4 marks · Normal
Answer and see the solution →This question is about reactions of propene (C3H6).
(a)[1 mark]Explain why propene is classified as an unsaturated hydrocarbon.
(b)[1 mark]Write a word equation for the addition reaction of propene with hydrogen.
(c)[2 marks]Describe what is formed when propene burns in a plentiful supply of air.
Question 363
2 marks · Normal
Answer and see the solution →Alkenes are a family of unsaturated hydrocarbons that undergo two main types of chemical reactions: combustion and addition.
Describe what happens during:
(a)[1 mark](i) the combustion of an alkene in oxygen
(b)[1 mark](ii) an addition reaction of an alkene
Question 364
2 marks · Hard
Answer and see the solution →State the products formed when pentene (C5H10) undergoes complete combustion in oxygen. Write a balanced chemical equation for the reaction.
Question 365
5 marks · Hard
Answer and see the solution →This question is about reactions of hexene (C6H12).
(a)[2 marks]Describe what happens to the C=C double bond in an addition reaction of hexene.
(b)[2 marks]State the product formed when hexene reacts with hydrogen in an addition reaction. Suggest the molecular formula of the product.
(c)[1 mark]Write a chemical equation for the complete combustion of hexene.
Question 366
2 marks · Hard
Answer and see the solution →Give a general description of what happens to an alkene during a combustion reaction. Explain why alkenes are not normally used as fuels.
Question 367
1 mark · Easy
Answer and see the solution →State the colour change observed when bromine water reacts with ethene.
Question 368
3 marks · Easy
Answer and see the solution →A student tests samples of pentane and pent-1-ene with bromine water.
(a)[1 mark]State what is observed when bromine water is added to pent-1-ene.
(b)[1 mark]State what is observed when bromine water is added to pentane.
(c)[1 mark]Explain why these observations allow you to distinguish between pentane and pent-1-ene.
Question 369
2 marks · Easy
Answer and see the solution →Write the balanced chemical equation for the addition reaction between propene ( ) and bromine ( ). State the name of the organic product formed.
Question 370
2 marks · Easy
Answer and see the solution →A student tests an unknown hydrocarbon with bromine water. The liquid does not decolourise bromine water. Explain what this result tells you about the type of hydrocarbon and give a reason.