Ethanol can be produced by the fermentation of glucose solution - Edexcel - GCSE Chemistry - Question 7 - 2020 - Paper 1
Question 7
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 → ethano... show full transcript
Worked Solution & Example Answer: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 answer is B: glucose → ethanol + carbon dioxide. This equation accurately represents the process of fermentation, where glucose is converted into ethanol and carbon dioxide.
Step 2
Suggest the formula of a molecule of pentanol.
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Answer
Pentanol, containing five carbon atoms, has the molecular formula C₅H₁₂O.
Step 3
Draw the structure of a molecule of ethanol. Show all bonds.
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Answer
The structure of ethanol is represented as:
H H
| |
H--C--C--O--H
| |
H H
This structure shows all the bonds clearly.
Step 4
Write the balanced equation for the reaction of ethanol with oxygen to form ethanoic acid and water.
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Answer
The balanced equation for the reaction is:
C2H5OH+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: 4/60 × 100. This is because there are four hydrogen atoms in ethanoic acid (CH₃COOH) and the molar mass is 60.
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
The reasons for using certain polymers include:
Poly(ethene): Used for plastic bags and bottles because it is flexible, waterproof, and lightweight.
Poly(chloroethene) (PVC): Used for window frames and water pipes due to its durability and weatherproofing properties.
Poly(tetrafluoroethene) (PTFE, Teflon): Used for frying pans as it is non-stick and heat resistant.
Problems in disposing of these polymers:
Many are non-biodegradable, leading to landfill issues.
Recycling can be difficult and time-consuming, requiring sorting.
