Rubber Matter

What is the substance from bacteria that can cause coagulation of latex?

Name a substance that can prevent coagulation of latex.

Which of the following solution can coagulate latex? [can choose more than one]

• formic acid

• ethanoic acid

• concentrated hydrochloric acid

• methanoic acid

What is the name of monomer for latex?

Name the process to improve the property of natural rubber?

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.

Substance P turns white latex milk into yellow solid. What is substance P?

• Ammonia solution

• Ethanoic acid

• Potassium hydroxide solution

• Potassium chloride solution

A lorry wants to transfer latex from a rubber estate to a rubber factory. Which substance can be added to the latex to prevent it from coagulating?

• Distilled water

• Tetrachloromethane

• Acetic acid

• Diluted sodium hydroxide solution

What is the name of chemical substance that can form the sulphur cross - linkage in natural rubber?