KSSM_FORM 4_CHAPTER 9_9.3_PART 2

Milky fluid obtained from tapped rubber tree is called .......

• latex

• rubber

• milk

• polymer

What is the characteristics of natural rubber? (more than 1 answer )

• elastic

• soft

• cannot withstand heat

• good electrical insulator

• not permeable to air

Rubber molecules is covered with a layer of ................. membrane.

• protein

• glycoprotein

• lipoprotein

• fatty acid

The layer of membrane surround with .................. charges.

• positive

• negative

Latex will coagulates when ................ is add to it.

• acid

• alkaline

• water

• air

Latex will remain as liquid when ................ is add to it.

• acid

• alkaline

• water

• air

Latex also coagulates itself when a presence of ...................... in latex.

• oxygen

• bacteria

• water

• carbon dioxide

Above is the activity to study the elasticity and heat effects of natural rubber. After stretching and twisting, is the rubber sheet able to return to its original shape?

• yes

• no

Above is the activity to study the elasticity and heat effects of natural rubber. After being heated, the natural rubber under go stretching and twisting process, is the rubber sheet able to return to its original shape?

• yes

• no

Above is the activity to study the action of acid and alkali on latex. What happen in P when Ethanoic acid is added?

• coagulates become solid

• remain as liquid