F4 SC CHP 9 ( TRIAL 2022)

which of the following is a special property of an alloy which is suitable for making aircraft body?

• Hard and heavy

• Shiny and strong

• Light and strong

• Low in density and shiny

Diagram shows the process of valcanization of rubber.

The S atom is added to the natural rubber polymer molecule to produce valcanized rubber.

What is the function of the S atom?

• Softens the rubber structure

• Decrease the strength of the rubber

• Decrease the density of the rubber

• Prevents the rubber polymer from sliding

Diagram shows an object made of alloy S.

What is the main metal in alloy S?

• Iron

• Copper

• Aluminium

• Magnesium

Diagram shows the arragement of atoms in steel.

What is atom X?

• Iron

• Carbon

• Copper

• Brozen

Diagram shows the formation of a substance.

What is process X?

• Depolymerisation

• Crystallisation

• Vulcanisation

• Polymerisation

Diagram shows the product from Mr Daniels rubber plantation.

Mr. Daniel wants to export the latex in liquid from abroad. After collecting the latex in a container, the latex coagulate. How can he overcomes this problem?

• Adding distilled water to latex

• Adding ethanoic acid to latex

• Adding sulfur powder to latex

• Adding ammonia solution to latex

Diagram shows the atomic arrangement of a substance.

What is the name of the process to produce the substance?

• Depolymerisation

• Polymerisation

• Vulcanisation

• Alloying

The information below shows the characteristic of a type of a substance.

*Very hard

*Brittle

*Good insulator of heat

Which of the following has the above characteristic?

• Alloy

• Glass

• Rubber

• Ceramic

Diagram shows an activity in a science laboratory.

What is glass S suitable to be used ?

• Resistant to corrosion

• Very high melting point

• Chemically inert

• Has a high refractive index

Diagram is a laboratory apparatus made of borosilicate glass. Why is borosilicate glass used to make laboratory apparatus?

• Has a high refractive index

• It is very high resistance to heat and chemicals

• It is resistance to heat and easily shaped

• It is a transparent glass