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 war 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 war equation for the fermentation of glucose solution?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is B: glucose → ethanol + carbon dioxide. This reflects the process of fermentation where glucose is converted into ethanol and carbon dioxide.
Step 2
Suggest the formula of a molecule of pentanol.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The formula for pentanol, which contains five carbon atoms, is C₅H₁₂O.
Step 3
Draw the structure of a molecule of ethanol. Show all bonds.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The molecular structure of ethanol can be represented as:
H H
| |
H--C--C--OH
| |
H H
This shows all bonds present in the ethanol molecule.
Step 4
C₂H₅OH + O₂ → CH₃COOH + __________
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The missing product is water (H₂O). Therefore, the complete equation is:
C₂H₅OH + O₂ → CH₃COOH + H₂O.
Step 5
Which calculation shows the percentage by mass of hydrogen in ethanoic acid?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct calculation is A: ( \frac{4}{60} \times 100 ). This shows the percentage of hydrogen, as there are four hydrogen atoms in the molecular formula of ethanoic acid (CH₃COOH).
Step 6
Discuss the reasons for using these polymers in the ways shown in Figure 13 and the problems in disposing of these.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The reasons for using the listed polymers include their specific properties:
Poly(ethene): It is flexible, waterproof, and lightweight, making it ideal for plastic bags and bottles.
Poly(chloroethene) (PVC): It is tough, durable, and serves as an excellent insulator for electrical applications.
Poly(tetrafluoroethene) (PTFE, Teflon): It offers non-stick properties, high heat resistance, and is perfect for frying pans and stain-proof clothing.
However, the disposal of these polymers poses significant challenges:
They are typically non-biodegradable, leading to landfills filling up over time.
Recycling is often not practical and can be time-consuming. Transport to recycling centers can also consume resources.
Burning them may release toxic substances, further complicating disposal.
