Manufactured substances in industry

Which alloy is correctly matched to its uses?

• Brass - Building of statues & monuments

• Bronze - Making of surgical instruments

• Stainless steel - Making of medals

• Duralumin - Making of the body of aeroplane

Alloy of copper is harder than pure copper. WHY???

• Atoms are orderly arranged.

• Spaces between atoms decrease.

• Attractive forces between copper atoms become weaker.

• Layers of copper atoms are more difficult to slide.

What is the effect of alloying pure gold?

• Become less hard

• Easier to be shaped

• Easier to melt

• Does not corrode

The frame structure of a bridge can withstand corrosion and is able to withstand a heavy load.

What is the combination of substance to produce the frame?

• Copper

• Iron

• Manganese

• Carbon

• Chromium

Choose the type of glass that is suitable to make the lid of the pot.

• Fused silica glass

• Borosilicate glass

• Soda lime glass

• Lead crystal glass

Compoment X is added to the glass in order to make the glass highly resistant to heat.

Name component X.

Name the major component in glass.

What is type of glass is formed when calcium carbonate is heated with the main component of glass?

• Fused silica glass

• Borosilicate glass

• Lead crystal glass

• Soda lime glass

A student was dazzled by the sunlight while doing revision. She wants to change the window glass to solve the problem. The new window glass should contained the substances...

• Lead(II) oxide

• Silver chloride

• Boron oxide

• Copper(I) chloride

Digital communication plays an important role in modern living.

Name the material that transmits data, voices and images in digital format effectively.

• Copper wire

• Optical fibre

• Fibre glass

• Superconductor