Alkenes — Paper 2 · IGCSE Physical Science 0652

20 Limonene is a colourless, unsaturated hydrocarbon found in lemons. Which row describes the colour change when a few drops of limonene are shaken with bromine? colour of bromine colour of bromine at the start of experiment after mixing with limonene A colourless colourless B colourless orange C orange colourless D orange orange

1 marks

Answer: C

This question in 0652/21 Oct/Nov 2017

20 Limonene is a colourless, unsaturated hydrocarbon found in lemons. Which row describes the colour change when a few drops of limonene are shaken with bromine? colour of bromine colour of bromine at the start of experiment after mixing with limonene A colourless colourless B colourless orange C orange colourless D orange orange

1 marks

Answer: C

This question in 0652/22 Oct/Nov 2017

18 Long-chain alkanes are broken down into shorter-chain compounds and an element. Which statement about the process is correct? A Alkenes are formed during the reaction. B The element is nitrogen. C The process is polymerisation. D The reaction occurs at room temperature.

1 marks

Answer: A

This question in 0652/21 Oct/Nov 2018

19 Which compound is the monomer used to make poly(ethene)? A B C D H H H H H H H H H H C C H C C H C C O H H C C C H H H H H H H H

1 marks

Answer: B

This question in 0652/21 Oct/Nov 2018

18 Long-chain alkanes are broken down into shorter-chain compounds and an element. Which statement about the process is correct? A Alkenes are formed during the reaction. B The element is nitrogen. C The process is polymerisation. D The reaction occurs at room temperature.

1 marks

Answer: A

This question in 0652/22 Oct/Nov 2018

19 Which compound is the monomer used to make poly(ethene)? A B C D H H H H H H H H H H C C H C C H C C O H H C C C H H H H H H H H

1 marks

Answer: B

This question in 0652/22 Oct/Nov 2018

19 When hexane is heated in the presence of a catalyst, it decomposes to give ethane, hydrogen and another hydrocarbon Y. The equation for the reaction is shown. C6H14 → C2H4 + Y + H2 Which type of hydrocarbon is Y and what is its formula? type of formula hydrocarbon A alkane C4H8 B alkane C4H10 C alkene C4H8 D alkene C4H10

1 marks

Answer: C

This question in 0652/21 Oct/Nov 2019

20 Which structure represents an unsaturated hydrocarbon? A B C D H H H O H H H H C C H H C C H C H H C C H H H H O H H

1 marks

Answer: D

This question in 0652/21 Oct/Nov 2019

19 When hexane is heated in the presence of a catalyst, it decomposes to give ethane, hydrogen and another hydrocarbon Y. The equation for the reaction is shown. C6H14 → C2H4 + Y + H2 Which type of hydrocarbon is Y and what is its formula? type of formula hydrocarbon A alkane C4H8 B alkane C4H10 C alkene C4H8 D alkene C4H10

1 marks

Answer: C

This question in 0652/22 Oct/Nov 2019

20 Which structure represents an unsaturated hydrocarbon? A B C D H H H O H H H H C C H H C C H C H H C C H H H H O H H

1 marks

Answer: D

This question in 0652/22 Oct/Nov 2019

6 Which molecules both contain double covalent bonds? A C2H4 and CH3OH B C2H4 and CO2 C H2 and C2H4 D H2 and CH3OH

1 marks

Answer: B

This question in 0652/21 Oct/Nov 2020

20 Alkenes are identified by reacting them with bromine. Which type of reaction is this? A addition B combustion C neutralisation D polymerisation

1 marks

Answer: A

This question in 0652/22 Oct/Nov 2020

20 The diagram shows a two-step reaction scheme. high CH2 CH2 CH2 CH3 temperature CH2 CH2 CH3 + CH2 CH2 CH3 CH2 CH2 CH2 reaction 1 CH3 CH2 CH2 + steam reaction 2 and a catalyst CH3CH2OH What are the names given to reaction 1 and reaction 2? reaction 1 reaction 2 A cracking addition B cracking fermentation C polymerisation addition D polymerisation fermentation

1 marks

Answer: A

This question in 0652/21 Oct/Nov 2021

20 Propene is an alkene. Which statement about propene is correct? A It reacts with hydrogen to form a polymer. B It turns bromine orange. C It undergoes addition reactions. D It will not react with steam.

1 marks

Answer: C

This question in 0652/21 Oct/Nov 2022

20 Propene is an alkene. Which statement about propene is correct? A It reacts with hydrogen to form a polymer. B It turns bromine orange. C It undergoes addition reactions. D It will not react with steam.

1 marks

Answer: C

This question in 0652/22 Oct/Nov 2022

19 The formula of but-2-ene is CH3CH=CHCH3. But-2-ene is reacted separately with steam and with bromine. Which row identifies the structures of the products of these reactions? with steam with bromine H H H H H H H H A H C C C C H H C C C C H H H OH H H H Br H H H H H H H H H B H C C C C H H C C C C H H H OH H H Br Br H H H H H H H H H C H C C C C H H C C C C H H H H OH H H Br H H H H H H H H H D H C C C C H H C C C C H H H H OH H Br Br H

1 marks

Answer: B

This question in 0652/21 Oct/Nov 2023

20 Liquid X has the properties shown. ● It is colourless. ● It is flammable. ● It can be made by the reaction of ethene with steam. ● The complete combustion of X produces carbon dioxide and water. What is X? A ethanol B methane C petrol D poly(ethene)

1 marks

Answer: A

This question in 0652/21 Oct/Nov 2023

19 The formula of but-2-ene is CH3CH=CHCH3. But-2-ene is reacted separately with steam and with bromine. Which row identifies the structures of the products of these reactions? with steam with bromine H H H H H H H H A H C C C C H H C C C C H H H OH H H H Br H H H H H H H H H B H C C C C H H C C C C H H H OH H H Br Br H H H H H H H H H C H C C C C H H C C C C H H H H OH H H Br H H H H H H H H H D H C C C C H H C C C C H H H H OH H Br Br H

1 marks

Answer: B

This question in 0652/22 Oct/Nov 2023

20 Liquid X has the properties shown. ● It is colourless. ● It is flammable. ● It can be made by the reaction of ethene with steam. ● The complete combustion of X produces carbon dioxide and water. What is X? A ethanol B methane C petrol D poly(ethene)

1 marks

Answer: A

This question in 0652/22 Oct/Nov 2023

20 The formulae of four compounds are shown. 1 C2H6 2 C4H8 3 C7H14 4 C10H22 Which compounds will decolourise bromine water? A 1 and 2 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: C

This question in 0652/21 Oct/Nov 2024