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Figure 12 shows the structure of the molecules of three organic compounds - Edexcel - GCSE Chemistry - Question 7 - 2023 - Paper 2
Question 7
Figure 12 shows the structure of the molecules of three organic compounds. (a) (i) Each molecule in Figure 12 contains a different functional group. Circle the alk... show full transcript
Worked Solution & Example Answer:Figure 12 shows the structure of the molecules of three organic compounds - Edexcel - GCSE Chemistry - Question 7 - 2023 - Paper 2
Step 1
Step 2
Complete the equation for the reaction of propene with bromine by drawing the structure of a molecule of the product.
Answer
The reaction of propene with bromine results in the formation of 1,2-dibromopropane. The product can be represented as:
Br Br
| |
H₂C=C → H₃C-C-
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H H
In this reaction, the bromine atoms add across the double bond.
Step 4
Describe how the fermentation of glucose is carried out and how the dilute solution of ethanol produced can then be processed to form a concentrated solution of ethanol.
Answer
Fermentation of glucose involves the following steps:
- Dissolve glucose in water to form a solution.
- Place the solution in a suitable fermentation vessel and add yeast, which contains enzymes to convert glucose into ethanol and carbon dioxide.
- Control the temperature (ideally between 25°C and 40°C) to enable yeast to function optimally, promoting ethanol production.
To obtain a concentrated solution of ethanol, the dilute ethanol solution can be distilled:
- Set up a distillation apparatus, including a distillation flask and a condenser.
- Heat the dilute solution gently to evaporate ethanol, which has a lower boiling point than water. Ethanol vapor rises and enters the condenser.
- Condensed ethanol is collected in a separate container, resulting in a more concentrated solution of ethanol.