Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
451–460 of 785
Question 451
2 marks · Normal
Answer and see the solution →Alcohols including ethanol have similar chemical properties. State one other alcohol (by name or formula) and describe what is observed when it burns in air.
Question 452
4 marks · Normal
Answer and see the solution →Ethanol is used in spirit burners for heating in a laboratory.
(a)[2 marks]Draw the displayed formula of ethanol.
(b)[2 marks]Complete the following word equation for the combustion of ethanol: ethanol + _____ → carbon dioxide + _____
Question 453
2 marks · Hard
Answer and see the solution →Describe what would be observed if ethanol vapour is passed over heated copper(II) oxide, and state the type of reaction taking place.
Question 454
5 marks · Hard
Answer and see the solution →A student investigates the combustion of ethanol and oxidation by potassium dichromate. Study the following information and answer the questions that follow.
(a)[1 mark]Write the structural formula of ethanol.
(b)[2 marks]Ethanol burns completely in air. Name the two products formed in this reaction and state whether this reaction is exothermic or endothermic.
(c)[2 marks]Describe what is observed when ethanol is warmed with acidified potassium dichromate(VI) solution.
Question 455
2 marks · Hard
Answer and see the solution →Explain why water is always formed as a product when any alcohol burns completely in air.
Question 456
1 mark · Easy
Answer and see the solution →State the initial colour of the potassium dichromate(VI) solution before ethanol is heated with it.
Question 457
3 marks · Easy
Answer and see the solution →(a)[2 marks]Explain why dilute sulfuric acid must be present for potassium dichromate(VI) to oxidise ethanol.
(b)[1 mark]State the role of sulfuric acid in this reaction.
Question 458
2 marks · Easy
Answer and see the solution →A student observes the colour change when ethanol is heated with potassium dichromate(VI) in dilute sulfuric acid. Explain why the green colour appears during this reaction.
Question 459
3 marks · Easy
Answer and see the solution →Results from three experiments on ethanol oxidation Experiment Potassium dichromate(VI) Dilute sulfuric acid Observed colour change 1 Yes Yes Orange to green 2 Yes No Orange, no change 3 No Yes Colourless, no change Using the data from the table, explain in terms of ions, the importance of dilute sulfuric acid for this experiment.
Question 460
1 mark · Easy
Answer and see the solution →Give the name of the organic product formed when ethanol is oxidised by heating with potassium dichromate(VI) in dilute sulfuric acid.