Ethanol is present in alcoholic drinks - Edexcel - GCSE Chemistry - Question 1 - 2014 - Paper 1
Question 1
Ethanol is present in alcoholic drinks.
(a) Ethanol is produced by fermentation of carbohydrates.
Complete the sentence by putting a cross (X) in the box next to yo... show full transcript
Worked Solution & Example Answer:Ethanol is present in alcoholic drinks - Edexcel - GCSE Chemistry - Question 1 - 2014 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct condition for fermentation is to add yeast at a temperature of about 35°C, so mark option B with an (X).
Step 2
Write the balanced equation for this reaction.
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Answer
The balanced equation for the reaction of ethene with steam to produce ethanol is:
C2H4+H2O→C2H5OH
Step 3
Describe what is meant by an homologous series.
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Answer
A homologous series is a group of organic compounds that share the same functional group and have similar chemical properties. Each adjacent member of the series differs by a CH2 unit in their molecular formula. For example, in the series of alcohols, each compound has one hydroxyl (-OH) group and the general formula can be represented as CnH2n+1OH.
