2.3.2 - Laboratory Activity : Comparing the Chemical Properties between Alkane and Alkene

Laboratory Activity 2.3.2: Comparing the Chemical Properties between Alkane and Alkene

Aim: To study the difference in chemical properties between alkane and alkene
Problem statement: Are the properties of alkenes is similar to alkanes?
Hypothesis: Alkene will decolourise bromine water and acidified potassium manganate (VII)
Variable:

	»	Fixed variable : Type of reagent used
	»	Manipulated variable : Alkane and the corresponding alkene
	»	Responding variable : Decolourised of the reagent

Material: » Hexane » Hexene » Bromine water » Acidified potassium manganate (VII)

Apparatus: » Test tube » Dropper » Measuring cylinder

Procedure:

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1. Each test tube is filled with 2cm3 of hexane and 2cm3 of hexene. 2. Few drops of bromine water are added into each test tube and shake well. 3. The colour change is observed. 4. The experiment is repeated with acidified potassium manganate (VII).

Observation:

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Process With hexane With hexene Reaction with bromine water Bromine water did not decolourised Bromine water decolourised Reaction with potassium manganate (VII) Purple colour of potassium manganate (VII) did not decolourised Purple colour of potassium manganate (VII) decolourised

Discussion:

	►	Hexane did not react with bromine water or potassium manganate (VII) because it is a saturated hydrocarbon.
	►	Hexene reacts by decolourising both bromine water and potassium manganate (VII) because it is an unsaturated hydrocarbon.

Conclusion:

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Alkane and alkene have different chemical properties.

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