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 word 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 word equation for the fermentation of glucose solution?
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Answer
The correct word equation for the fermentation of glucose solution is:
B glucose → ethanol + carbon dioxide.
Step 2
Suggest the formula of a molecule of pentanol.
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Answer
Pentanol contains five carbon atoms. Its formula is:
C5H12O.
Step 3
Draw the structure of a molecule of ethanol.
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Answer
The structure of ethanol can be drawn as follows:
H H
| |
H—C—C—O—H
| |
H H
This representation shows all bonds.
Step 4
C2H5OH + O2 → C2H4COOH + _____________
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Answer
To balance the equation, we can find that water is produced, so the missing part is:
H2O.
The full balanced reaction is:
C2H5OH + O2 → C2H4COOH + 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 4/60 × 100.
This reflects that there are four hydrogen atoms in the molecular formula C2H4O2, contributing to its relative formula mass.
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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Answer
Reasons for Using the Polymers:
Poly(ethene)
Uses: Plastic bags, plastic bottles.
Properties: Flexible, waterproof, and lightweight.
Poly(chloroethene) (PVC)
Uses: Window frames, water pipes.
Properties: Tough, durable, and a good insulator.
Poly(tetrafluoroethene) (PTFE, Teflon)
Uses: Frying pans, stain-proofing for clothing.
Properties: Non-stick, heat-resistant, and slippery.
Problems in Disposing of These Polymers:
Non-biodegradable: These materials can persist in landfills for very long periods.
Landfill Issues: They occupy space and require new land or landfill sites to be created.
Recycling Challenges: Sorting and recycling can be time-consuming and resource-intensive, leading to increased fuel consumption in transportation.
Environmental Impact: Burning these materials can release toxic substances, contributing to global warming and other ecological issues.
