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) Complete the missing label on Figure 9. (b) The student dissolved 45g of glucose in water to make 150 cm³ of glucose solution. Calculate the concentration of this solution in g dm⁻³. (c) State what should be added to the glucose solution to cause the fermentation reaction.

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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) Comp... 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

The missing label on Figure 9 is 'fermentation flask' or 'fermentation vessel'. This type of flask is used to carry out the fermentation process.

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 in g dm⁻³, we can use the formula:

$\text{Concentration (g dm}^{-3}\text{)} = \frac{\text{mass of solute (g)}}{\text{volume of solution (dm}^3\text{)}}$

The mass of glucose is 45 g and the volume of the solution is 150 cm³, which is equivalent to 0.15 dm³. Therefore, the concentration is:

$\text{Concentration} = \frac{45\, \text{g}}{0.15\, \text{dm}^3} = 300\, \text{g dm}^{-3}$

Step 3

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 enzymes that convert glucose to ethanol and carbon dioxide through fermentation.

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Ethanol can be made by fermentation of a solution of glucose, a carbohydrate - Edexcel - GCSE Chemistry - Question 5 - 2023 - Paper 2

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

Complete the missing label on Figure 9.

Calculate the concentration of this solution in g dm⁻³.

State what should be added to the glucose solution to cause the fermentation reaction.

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