Chemical Properties of Alkanes: Experiment
Experiment # 1
Date: 18/12/13
Title: Chemical Properties of Alkanes.
Aim: To test the reactivity of alkanes using cyclohexane as an example.
Apparatus/Materials: Cyclohexane, liquid alkane, aqueous bromine, test tubes, light source, watch glass, splint, 0.1 MKMnO4, concentrated H2SO4, dilute H2SO4.
Method:
Combustion:
1. A watch glass was placed on a benched protection sheet in a fume cupboard and the extractor in the fume on.
2. 4 drops of cyclohexane was placed on the watch glass using a teat pipette.
3. The bottle of cyclohexane was removed to a safe place away from the watch glass and any Bunsen flames.
4. The front of the fume cupboard was pulled down leaving a 30cm opening.
5. A long splint was lit and used to light the cyclohexane. The front of the fume cupboard was lowered to a 10cm opening.
6. All results were tabulated using a table.
Observation:
Table Showing Observation Of Experiment.
Test
Observation
Inference
Combustion.
Yellow flame
White soot
Pungent odor
C6H12 + 9 O2 --> 6 CO2 + 6 HOH
Reaction with Bromine water.
In sunlight and in the dark.
In sunlight, colour changes from pale yellow to a top orange layer and bottom yellow layer.
In dark there is no colour change, solution remains pale yellow.
C6 H12 + Br2 --> C6H11Br + HBr
Reaction with acidified Potassium Manganate (VII)
Top layer purple
Bottom layer colorless
Reaction with concentrated Sulphuric Acid. Colorless top and bottom layer
Conclusion:
Experiment: # 2
Date: 18/12/13
Title: Chemical properties of alkenes
Aim: To test the reactivity of alkenes using cyclohexene as an example.
Apparatus/Materials: Cyclohexene, liquid alkane, aqueous bromine, test tubes, light source, watch glass, splint, 0.1 MKMnO4, concentrated H2SO4, dilute H2SO4.
Method:
Combustion:
1. A watch glass was placed on a benched protection sheet in a fume cupboard and the extractor in the fume on.
2. 4 drops of cyclohexene was placed on the watch glass using a teat
Date: 18/12/13
Title: Chemical Properties of Alkanes.
Aim: To test the reactivity of alkanes using cyclohexane as an example.
Apparatus/Materials: Cyclohexane, liquid alkane, aqueous bromine, test tubes, light source, watch glass, splint, 0.1 MKMnO4, concentrated H2SO4, dilute H2SO4.
Method:
Combustion:
1. A watch glass was placed on a benched protection sheet in a fume cupboard and the extractor in the fume on.
2. 4 drops of cyclohexane was placed on the watch glass using a teat pipette.
3. The bottle of cyclohexane was removed to a safe place away from the watch glass and any Bunsen flames.
4. The front of the fume cupboard was pulled down leaving a 30cm opening.
5. A long splint was lit and used to light the cyclohexane. The front of the fume cupboard was lowered to a 10cm opening.
6. All results were tabulated using a table.
Observation:
Table Showing Observation Of Experiment.
Test
Observation
Inference
Combustion.
Yellow flame
White soot
Pungent odor
C6H12 + 9 O2 --> 6 CO2 + 6 HOH
Reaction with Bromine water.
In sunlight and in the dark.
In sunlight, colour changes from pale yellow to a top orange layer and bottom yellow layer.
In dark there is no colour change, solution remains pale yellow.
C6 H12 + Br2 --> C6H11Br + HBr
Reaction with acidified Potassium Manganate (VII)
Top layer purple
Bottom layer colorless
Reaction with concentrated Sulphuric Acid. Colorless top and bottom layer
Conclusion:
Experiment: # 2
Date: 18/12/13
Title: Chemical properties of alkenes
Aim: To test the reactivity of alkenes using cyclohexene as an example.
Apparatus/Materials: Cyclohexene, liquid alkane, aqueous bromine, test tubes, light source, watch glass, splint, 0.1 MKMnO4, concentrated H2SO4, dilute H2SO4.
Method:
Combustion:
1. A watch glass was placed on a benched protection sheet in a fume cupboard and the extractor in the fume on.
2. 4 drops of cyclohexene was placed on the watch glass using a teat