Laboratory Activity 2.9.2: Characteristic of Vulcanised and Unvulcanised Rubber |
Problem statement: What is the difference between vulcanised and unvulcanised rubber in term of elasticity?
Hypothesis: Vulcanised rubber is more elastic than unvulcanised rubber.
Variable:
» | Fixed variable : The width and thickness of rubber strip, mass of weight | |
» | Manipulated variable : Type of rubber strips | |
» | Responding variable : Elasticity |
Material: » Latex » Ethanoic acid » Sulphur monochloride solution in methylbenzene |
Apparatus: » White tile » Knife » Glass rod » Beaker » Retort stand » Weight » Ruler |
► | (A) Preparation of vulcanised rubber
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► | (B) Comparing vulcanised and unvulcanised rubber
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► | Extension of rubber strip
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► | The unvulcanised rubber strip extends more as compared to the vulcanised rubber strip. | |
► | Vulcanised rubber has a greater resistance to force (weight) | |
► | The vulcanised rubber strip has an ability to return to its original length after the weight is taken off. Thus, the vulcanised rubber strip is more elastic. |
► | Vulcanised rubber is more elastic as compared with natural rubber. |
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