Vulcanization

Which of the following are characteristics of vulcanised rubber? [can choose more than 1 answer]

• More resistant to high heat

• More resistant to oxidation

• Less elastic than natural rubber

• Less resistant chemical solution

Which of the following comparison between natural rubber and vulcanised rubber are correct? [can choose more than 1 answer]

• Vulcanised rubber is more elastic than natural rubber.

• Vulcanised rubber is harder than natural rubber.

• Vulcanised rubber cannot withstand heat while natural rubber can withstand heat.

• Vulcanised rubber cannot oxidise easily while natural rubber can oxidise easily.

natural rubber is made up of ______ monomer.

• styrene

• isoprene

• ethene

vulcanization is the process of adding ________ into natural rubber.

• oxygen

• ammonia

• sulphur

• acid

The aircraft tyres are made from vulcanized rubber. What property of vulcanized rubber makes it suitable to be used for making these aircraft tyres?

• it resist to oxidation

• it is harder and stronger

• it can maintain their elasticity

• it can take the tremendous stress and strength

Which of the following is the monomer of natural rubber?

• 
• 
• 
• 

Which of the following occurs when natural rubber is vulcanised?

• The rubber becomes softer

• The rubber melts more easily when heated

• More double bonds are formed in the rubber polymer chain

• The rubber becomes more elastic