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Propene is an alkene - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1
Question 6
Propene is an alkene. The formula of its molecule is C₃H₆. (i) Draw the structure of a propene molecule, showing all of the bonds. (ii) One molecule of decane, C₁₀... show full transcript
Worked Solution & Example Answer:Propene is an alkene - Edexcel - GCSE Chemistry - Question 6 - 2012 - Paper 1
Step 1
Describe a test to show which gas is propane and which gas is propene.
Answer
To differentiate between propane and propene,
- Bromine Water Test: Add a few drops of bromine water to separate test tubes containing each gas, ensuring that the tests are conducted in well-ventilated areas or under a fume hood.
- Observation: Propene will decolorize the bromine water due to the presence of a double bond, indicating an addition reaction. In contrast, propane, being an alkane without a double bond, will not affect the bromine water and it will retain its brownish color.
This method effectively distinguishes between the two gases based on their reactivity.