WorksheetsF5 4.2 Natural rubber
Total questions: 10
Worksheet time: 10mins
Which of the following is not the example of natural polymers and its corresponding monomer?
Natural rubber (isoprene)
Starch (glucose)
Cellulose (glucose)
Protein (fatty acid)
What chemical is the most suitable to be used to speed up the coagulation of latex?
Sodium hydroxide solution
Sulphuric acid
Methanoic acid
Ammonia
What chemical is suitable to prevent the coagulation of latex?
Ammonia
Sodium hydroxide
Sulphuric acid
Methanoic acid
Which of the following is not the property of natural rubber?
Sensitive to heat
Elasticity decreases over time
Easily oxidized by air
Hard and brittle
What is vulcanization?
A process whereby rubber is reacted with oxygen.
A process whereby rubber is reacted with sulphur
A process whereby rubber is reacted with methanoic acid
A process whereby rubber is reacted with ammonia
What is the IUPAC name of the molecule shown in the diagram?
2-methylbut-1,3-diene
Isoprene
3-methylbut-1,3-diene
Which of the following is true about vulcanized and unvulcanized rubber?
Vulcanized rubber is less elastic than unvulcanized rubber
Vulcanized rubber become soft and sticky easily compared to unvulcanized rubber
Vulcanized rubber is stronger than unvulcanized rubber
Vulcanized rubber is more easily oxidised than unvulcanized rubber
Based on diagram, what is X?
Oxygen
Hydrogen
Sulphur
Chlorine
What is the name of the Process Y?
Sulphuration
Vulcanization
Unvulcanization
Oxidation
This is the characteristics of unvulcanised rubber except..
Low strength
Easier to be oxidised
More elastic
Soft
