The formula of a molecule of ethanol is C₂H₅OH - Edexcel - GCSE Chemistry - Question 6 - 2016 - Paper 1
Question 6
The formula of a molecule of ethanol is C₂H₅OH.
(i) State how you know, from its formula, that ethanol is not a hydrocarbon.
(ii) A dilute solution of ethanol c... show full transcript
Worked Solution & Example Answer:The formula of a molecule of ethanol is C₂H₅OH - Edexcel - GCSE Chemistry - Question 6 - 2016 - Paper 1
Step 1
i) State how you know, from its formula, that ethanol is not a hydrocarbon.
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Answer
Ethanol contains oxygen (O) atoms in its formula. Hydrocarbons only consist of carbon (C) and hydrogen (H) atoms.
Step 2
ii) Starting from sugar (a carbohydrate), describe how a dilute solution of ethanol can be produced.
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Answer
To produce ethanol from sugar, first dissolve sugar in water.
Then, add yeast to the solution.
Leave the mixture in a warm place to allow fermentation to occur, during which yeast converts the sugar into alcohol.
Ensure the mixture is in an anaerobic condition, often achieved by using an airlock to prevent oxygen from entering. This process yields a dilute solution of ethanol.
Step 3
iii) Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
C. an ester.
Step 4
iv) Complete the equation.
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Answer
C₂H₅OH + CH₃COOH → C₂H₅COOCH₃ + H₂O.
Step 5
b) Name and draw the structures of some alkanes and some alkenes.
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