Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alkenes
106 practice questions
Topics covered
Practice questions
71–80 of 106
Question 71
2 marks · Normal
Answer and see the solution →State the displayed formula of the product formed when but-1-ene reacts with bromine water, and give its name.
Question 72
4 marks · Normal
Answer and see the solution →(a)[1 mark]State what is meant by an unsaturated compound.
(b)[2 marks]Describe a chemical test to distinguish between hexane and hex-1-ene.
(c)[1 mark]Predict and state the result for each compound.
Question 73
3 marks · Normal
Answer and see the solution →When 28 g of ethene () gas reacts completely with bromine () solution in an addition reaction, calculate the maximum mass of 1,2-dibromoethane () that can be formed.
Give your answer to the nearest whole number. (Relative atomic masses: H = 1, C = 12, Br = 80)
Question 74
2 marks · Hard
Answer and see the solution →State and explain what you would observe when bromine water is added to but-2-ene. Write a chemical equation for the reaction.
Question 75
5 marks · Hard
Answer and see the solution →A student has two unlabelled liquid samples: cyclohexane and cyclohexene. The student wants to identify which is which using bromine water.
(a)[2 marks]Describe how the student should carry out the test with bromine water to distinguish between the two compounds.
(b)[2 marks]Predict and explain what you would observe with each compound after adding bromine water and shaking.
(c)[1 mark]Identify which compound is the alkene. Justify your answer based on your observations.
Question 76
2 marks · Hard
Answer and see the solution →Give the structural formula of the product formed when hex-2-ene reacts with bromine. Name the type of reaction that occurs.
Question 77
1 mark · Easy
Answer and see the solution →State the product formed when ethene reacts with steam.
Question 78
3 marks · Easy
Answer and see the solution →(a)[1 mark]Write the balanced chemical equation for the hydrogenation of ethene.
(b)[1 mark]Name the product formed in this reaction.
(c)[1 mark]State the type of reaction taking place.
Question 79
2 marks · Easy
Answer and see the solution →Calculate the mass of water needed to react completely with 7.0 g of ethene in the hydration reaction. (M_r of C2H4 = 28, M_r of H2O = 18)
Question 80
2 marks · Easy
Answer and see the solution →Explain, with reference to the products formed, why the reactions of ethene with hydrogen and with steam are both called addition reactions.