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Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1
Question 4
Complete the sentence by putting a cross (X) in the box next to your answer. Alkenes are A ☐ saturated carbohydrates B ☐ saturated hydrocarbons C ☐ unsaturated car... show full transcript
Worked Solution & Example Answer:Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1
Step 1
Step 2
4(b)(i) Draw the structure of a propene molecule
Answer
The structure of a propene molecule can be illustrated as follows:
H H
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H—C=C—C—H
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H H
This shows that propene consists of three carbon atoms, with a double bond between the first and second carbon atoms and all hydrogen atoms included.
Step 3
4(b)(ii) Describe a test for propane and propene
Answer
To differentiate between propane and propene, one can conduct the following test:
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Add bromine water to both gases:
- Propene will decolorize bromine water, turning from brown to colorless, indicating the presence of a double bond.
- Propane will not react with bromine water and will leave the solution brown.
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Observation: If the bromine water turns colorless, the gas tested is propene. If it remains brown, the gas is propane.