Ethanol can be made by fermentation of a solution of glucose, a carbohydrate - Edexcel - GCSE Chemistry - Question 5 - 2023 - Paper 2
Question 5
Ethanol can be made by fermentation of a solution of glucose, a carbohydrate.
A student used the apparatus shown in Figure 9 for the fermentation reaction.
(a) Com... show full transcript
Worked Solution & Example Answer:Ethanol can be made by fermentation of a solution of glucose, a carbohydrate - Edexcel - GCSE Chemistry - Question 5 - 2023 - Paper 2
Step 1
Complete the missing label on Figure 9.
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Answer
In the fermentation setup shown in Figure 9, the missing label is 'yeast'. Yeast is essential for converting glucose into ethanol during fermentation.
Step 2
Calculate the concentration of this solution in g dm⁻³.
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Answer
To calculate the concentration of the glucose solution, we use the formula:
ext{Concentration} = rac{ ext{mass of solute (g)}}{ ext{volume of solution (dm}^3 ext{)}}
The mass of glucose is 45 g, and the volume is 150 cm³, which is equivalent to 0.150 dm³.
State what should be added to the glucose solution to cause the fermentation reaction.
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Answer
To initiate the fermentation reaction, 'yeast' should be added to the glucose solution. Yeast contains the enzymes required to convert glucose into ethanol and carbon dioxide.
