7. (a) Ethanol can be produced by the fermentation of glucose solution - Edexcel - GCSE Chemistry - Question 7 - 2020 - Paper 1
Question 7
7. (a) Ethanol can be produced by the fermentation of glucose solution.
Which of these shows the water equation for the fermentation of glucose solution?
A glucose ... show full transcript
Worked Solution & Example Answer:7. (a) Ethanol can be produced by the fermentation of glucose solution - Edexcel - GCSE Chemistry - Question 7 - 2020 - Paper 1
Step 1
Which of these shows the water equation for the fermentation of glucose solution?
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Answer
The correct answer is B: glucose → ethanol + carbon dioxide. This is the only correct equation as it accurately represents the fermentation process.
Step 2
Suggest the formula of a molecule of pentanol.
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Answer
The formula for a molecule of pentanol, which contains five carbon atoms, is C₅H₁₂O.
Step 3
Draw the structure of a molecule of ethanol.
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Answer
The structure of ethanol can be represented as follows:
H H
| |
H—C—C—OH
| |
H H
This diagram shows all bonds between the atoms.
Step 4
Complete the equation for this reaction.
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Answer
The completed equation is:
CH3CH2OH+O2→CH3COOH+H2O
Step 5
Which calculation shows the percentage by mass of hydrogen in ethanoic acid?
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Answer
The correct calculation is C: 604×100, as ethanoic acid contains four hydrogen atoms.
Step 6
Discuss the reasons for using these polymers in the ways shown in Figure 13 and the problems in disposing of these.
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The use of polymers is based on their specific properties:
Poly(ethene) is used for making flexible and waterproof plastic bags and bottles.
Poly(chloroethene) (PVC) is tough and durable, making it suitable for window frames and pipes.
Poly(tetrafluoroethene) (PTFE, Teflon) is non-stick and heat resistant, hence used for frying pans and stain-proofing.
Disposal Problems:
Many of these polymers are non-biodegradable, leading to landfill challenges.
Recycling requires sorting and is time-consuming, creating additional costs.
Burning can release harmful substances, impacting the environment.
