Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Alkenes
106 practice questions
Topics covered
Practice questions
91–100 of 106
Question 91
3 marks · Normal
Answer and see the solution →The hydration of ethene is used industrially to make ethanol from ethene and steam. Write a balanced chemical equation for this reaction. Give two reasons why converting ethene to ethanol by hydration is important for industry.
Question 92
4 marks · Normal
Answer and see the solution →The table shows two important reactions of ethene.
Addition reactions of ethene Name of reaction Reactants Product Hydrogenation Ethene (), hydrogen () Hydration Ethene (), water (steam, ) (a)Complete the table by writing the balanced symbol equation for each reaction. Write the correct chemical formula for each product.
(i)[1 mark]Hydrogenation of ethene:
(ii)[2 marks]Hydration of ethene:
(b)State the names of the organic products formed in the two reactions above.
(i)[0.5 marks]Product from hydrogenation:
(ii)[0.5 marks]Product from hydration:
Question 93
2 marks · Hard
Answer and see the solution →Write a balanced chemical equation for the hydration of ethene, and name the product formed.
Question 94
5 marks · Hard
Answer and see the solution →Ethene is an important starting material in the chemical industry.
(a)[2 marks]Write the balanced chemical equation for the hydrogenation of ethene.
(b)[2 marks]Write the balanced chemical equation for the hydration of ethene.
(c)[1 mark]State one use for the product of the hydration reaction.
Question 95
2 marks · Hard
Answer and see the solution →State the type of reaction that occurs when ethene reacts with hydrogen, and name the product formed.
Question 96
5 marks · Easy
Answer and see the solution →This question is about alkenes with up to four carbon atoms and their physical properties.
(a)[1 mark]Draw the displayed formula of ethene.
(b)[1 mark]Give the general formula for all alkenes.
(c)[2 marks]State the physical state of propene and butene at room temperature.
(d)[1 mark]Complete this sentence: "The physical state of small alkenes (up to butene) at room temperature is similar to the physical state of small _____."
Question 97
5 marks · Easy
Answer and see the solution →The table below shows two hydrocarbon molecules.
Molecule Structural formula A CH_3CH=CH_2 B CH_3CH_2CH_3 (a)[2 marks]Which molecule is unsaturated? Explain your answer.
(b)[1 mark]State how the presence of a C=C bond affects the chemical properties of alkenes.
(c)[1 mark]Describe the physical state of molecule A at room temperature.
(d)[1 mark]Compare the boiling points of molecule A and molecule B.
Question 98
5 marks · Easy
Answer and see the solution →Answer the questions about alkenes below.
(a)A straight-chain alkene has the formula C4H8. Draw the displayed formula of one isomer of C4H8 and name it.
(i)[1 mark]Draw the displayed formula.
(ii)[1 mark]Name this isomer.
(b)[2 marks]The general formula for alkenes is CnH2n. Calculate the molecular formula of the alkene with 7 carbon atoms.
(c)[1 mark]Explain how the physical state of the C7 alkene compares to the C4 alkene at room temperature.
Question 99
5 marks · Easy
Answer and see the solution →This question is about the structure and properties of small alkenes.
(a)[1 mark]Draw the displayed formula of propene.
(b)[1 mark]State whether butene is a gas, liquid or solid at room temperature.
(c)[2 marks]Describe the trend in boiling points as the number of carbon atoms increases from ethene to butene.
(d)[1 mark]Name the homologous series to which these alkenes belong.
Question 100
6 marks · Normal
Answer and see the solution →(a)[1 mark]Describe what is observed when bromine water is added to an alkene and the mixture is shaken.
(b)[2 marks]Write a balanced chemical equation for the reaction between but-2-ene and bromine.
(c)[1 mark]Explain why the reaction you wrote in part b is called an addition reaction.
(d)[1 mark]Describe what you would see if bromine water is added to hexane instead of but-2-ene and the mixture is shaken.
(e)[1 mark]State the difference between complete combustion and addition reactions of alkenes.