Chemistry Form 4 Chap 8

Which of the following is TRUE about an alloy?

• An alloy is a pure metal which is weak and soft

• An alloy is a compound consisting of metal and non-metal

• an alloy is a long chain of molecules formed by monomers

• an alloy is a mixture of two or more elements with a certain fixed composition in which the major component is a metal

What is the use of duralumin?

• making a aircraft body frame

• making of musical instruments

• making of electrical instruments

• making of surgical instruments

Which of the following are the compositions of pewter?

I. Aluminium

II. Tin

III. Antimony

IV. Copper

• I, II, III

• I, II, IV

• II, III, IV

• I, II, III, IV

Which of the following are the purpose of making alloys?

I. To prevent corrosion

II, To increase the strength and hardness

III. To improve the appearance

IV. To increase the density

• I and II

• II and IV

• I, II and III

• I, II, III and IV

What is the main component of glass?

• Silicon

• Silica

• Kaolin

• Sodium carbonate

Low Melting point (700ºC)

Cracks easily with sudden temperature changes

Easy to mould and shape

Which of the following types of glass shows the above properties

• Fused silica glass

• Soda-lime glass

• Borosilicate glass

• Lead crystal glass

Which of the following are correct pairs about the use of the types of glass?

I. Fused glass - telescope mirrors

II. Soda-lime glass - Window panes

III. Borosilicate - electrical bulb

IV. Lead crystal glass - laboratory glass ware

• I and II

• II and III

• II and IV

• III and IV

Which of the following is true about ceramic ?

• ceramic has low melting point

• ceramic is soft and weak

• ceramic is inert to chemicals

• Ceramic is poor insulator of electricity and heat

Which of the following are TRUE about composite material?

I. It is formed by combining two or more materials

II. It is created for specific purpose and use

III. It has properties that are superior of the original components

IV. Reinforced concrete, superconductor and photochromic glass are the examples of composite materials

• I, II and III

• I, II and IV

• II, III and IV

• I, II, III and IV

Which of the following composite materials match with its property?

• reinforce concrete - soft and weak

• superconductor - transparent and no reflect to light rays

• photochromic glass - insulator of electricity

• fibre glass - high density and nonflexible