Ethanol can be made by fermentation - Edexcel - GCSE Chemistry - Question 2 - 2014 - Paper 1
Question 2
Ethanol can be made by fermentation.
(a) (i) In a fermentation reaction, yeast is added to sugar solution.
Complete the sentence by putting a cross (\[X\]) in the... show full transcript
Worked Solution & Example Answer:Ethanol can be made by fermentation - Edexcel - GCSE Chemistry - Question 2 - 2014 - Paper 1
Step 1
In a fermentation reaction, yeast is added to sugar solution because it
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Answer
The yeast is added to the sugar solution because it C is an alcohol. Yeast ferments sugars to produce ethanol, which qualifies it as an alcohol.
Step 2
Explain how the contents of the flask at 75°C would be different from the contents of the flask at 40°C.
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Answer
At 75°C, the higher temperature may cause the enzymes in the yeast to denature, which would inhibit fermentation. Consequently, the flask at 75°C might contain less or no ethanol compared to the flask at 40°C, where fermentation can proceed more efficiently, resulting in a higher ethanol concentration.
