Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Ethanol can be oxidised by heating with potassium dichromate(VI) in dilute sulfuric acid
21 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Describe what happens when ethanol is heated with potassium dichromate(VI) in dilute sulfuric acid. In your answer, name the organic product and state the type of chemical change occurring.
Question 2
5 marks · Hard
Answer and see the solution →(a)[1 mark]A student adds ethanol to a solution of potassium dichromate(VI) in dilute sulfuric acid. She then heats the mixture in a water bath.
State the initial colour of the potassium dichromate(VI) solution before the ethanol is added and heated.
(b)[2 marks]Describe the colour change observed as the reaction occurs and explain what causes this change.
(c)[1 mark]Which ion is responsible for the green colour observed at the end of the reaction?
(d)[1 mark]Explain why the colour change provides evidence that a redox reaction has taken place.
Question 3
2 marks · Hard
Answer and see the solution →Explain why dilute sulfuric acid must be present when potassium dichromate(VI) is used to oxidise ethanol. Include in your answer the role that the acid plays in the reaction.