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Chemistry Alkanes/Alkenes Paper

Words: 249, Paragraphs: 4, Pages: 1

Paper type: Essay , Subject: Chemistry

Experiment: Comparing reactivities of alkanes and alkenes Aim: To compare the reactivities of an alkane and an alkene with bromine water and a solution of potassium permanganate (KMnO4). Equipment: •4 test tubes •Test-tube rack •4 pipettes Safety: safety glasses must be worn to prevent injury to the eyes. Ensure room is well ventilated whilst using the hydro carbons. Method: 1. Place 1 ml of sample A (cyclohexane) into a test tube containing 4 mls of the bromine water solution.

Record observations of any reaction. 2. Place 1 ml of sample A (cyclohexane) into a test tube containing 4 mls of the potassium permanganate solution. Record observations of any reaction. 3. Place 1 ml of sample B (cyclohexene) into a test tube containing 4 mls of the bromine water solution. Record observations of any reaction. 4. Place 1 ml of sample B (cyclohexene) into a test tube containing 4 mls of the potassium permanganate solution.

Record observations of any reaction. RESULTS SampleReaction with br2 waterReaction with acidified KMnO4Hydrocarbon (alkane/alkene) ANo reaction, both liquids immiscible, br2 water kept its yellow colourNo reaction, both liquids immiscible, KMnO4 solution kept its purple colourAlkane BBoth liquids reacted, causing 2 immiscible transparent liquidsBoth liquids reacted, causing the KMnO4 solution to change to a brownie red colourAlkene

Analysis: The positive reaction in the experiment was the reaction between the alkene (cyclohexene) and both the bromine water and the potassium permanganate solution. Below is a balanced structural formula for the reaction between cyclohexene and the bromine water:

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