Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alkenes
106 practice questions
Topics covered
Practice questions
61–70 of 106
Question 61
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.
Question 62
3 marks · Easy
Answer and see the solution →A student compares the reaction of different alkenes with bromine water. The results are shown in the table.
Alkene tested Observation with bromine water ethene colourless propene colourless but-1-ene colourless (a)[1 mark]Describe the pattern in the results.
(b)[1 mark]State a conclusion about the reaction between alkenes and bromine water.
(c)[1 mark]Suggest what would happen if pent-1-ene was tested with bromine water.
Question 63
1 mark · Easy
Answer and see the solution →What is the chemical test used to distinguish between an alkane and an alkene?
Question 64
3 marks · Easy
Answer and see the solution →Hept-1-ene is reacted with bromine water.
(a)[1 mark]Write the structural formula of the product formed.
(b)[1 mark]Name the type of reaction that takes place.
(c)[1 mark]State the name of the organic product.
Question 65
2 marks · Easy
Answer and see the solution →A sample of an alkene is tested with bromine water. The orange colour remains. Calculate the number of carbon–carbon double bonds present in one molecule of the alkene and explain your answer.
Question 66
2 marks · Normal
Answer and see the solution →State the overall type of reaction that occurs when bromine water reacts with ethene, and give the name of the organic product formed.
Question 67
4 marks · Normal
Answer and see the solution →(a)[1 mark]Describe the result you would see when bromine water is shaken with a liquid alkene.
(b)[1 mark]Describe what you would see if bromine water is shaken with a liquid alkane, under the same conditions.
(c)[2 marks]Explain how you can use this test to distinguish between an alkene and an alkane.
Question 68
3 marks · Normal
Answer and see the solution →A student wants to test whether an unknown colourless liquid is an alkane or an alkene. The student adds a few drops of bromine water to the liquid in a test tube and shakes it. After a short time, the orange colour disappears and the mixture becomes colourless. Explain what conclusion the student should make about the liquid and the reason for this result.
Question 69
4 marks · Normal
Answer and see the solution →A student investigates the reaction between different alkenes and bromine water. The table shows the results.
Observations on addition of bromine water to different compounds. Compound Observation after adding bromine water Ethene Colourless Propene Colourless Butane Orange Cyclohexene Colourless (a)[2 marks]Which of these compounds are alkenes? Give a reason for your choice.
(b)[2 marks]Write a balanced equation for the reaction of ethene with bromine water.
Question 70
1 mark · Normal
Answer and check →Which observation confirms that a compound is an alkane, rather than an alkene, when tested with bromine water?
- A.The solution becomes colourless.
- B.The solution stays orange.
- C.A gas is given off.
- D.The solution turns milky.