7.4 - Preparation and Properties of Ethanal (Leaving Cert Chemistry): Quizzes
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12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is the boiling point of ethanal?
What is the boiling point of ethanal?
Why is the collection flask surrounded by ice water during ethanal preparation?
Why is the collection flask surrounded by ice water during ethanal preparation?
To prevent evaporation due to low BP
What colour change occurs in the dichromate solution during ethanol oxidation?
What colour change occurs in the dichromate solution during ethanol oxidation?
Orange to green
What product forms if excess sodium dichromate is used in the oxidation?
What product forms if excess sodium dichromate is used in the oxidation?
Ethanoic acid
What temperature range is collected during redistillation of ethanal?
What temperature range is collected during redistillation of ethanal?
to
Which hazard is associated with sodium dichromate?
Which hazard is associated with sodium dichromate?
Strong oxidising agent and toxic
What observation indicates a positive Fehling's test with ethanal?
What observation indicates a positive Fehling's test with ethanal?
Red-brown precipitate forms
What observation indicates a positive Tollen's test?
What observation indicates a positive Tollen's test?
Silver mirror forms
How much water is added to the round-bottom flask initially?
How much water is added to the round-bottom flask initially?
What is the safe procedure for adding sulfuric acid?
What is the safe procedure for adding sulfuric acid?
Add acid to water slowly
What happens when ethanal is tested with potassium manganate (VII)?
What happens when ethanal is tested with potassium manganate (VII)?
Solution decolourises
How does Fehling's solution react differently with aldehydes and ketones?
How does Fehling's solution react differently with aldehydes and ketones?
Aldehydes give precipitate, ketones no reaction