Manufactured Substances in Industry

The diagram shows the arrangement of atom in brass. Why is brass harder than pure copper?

• Zinc atoms form very strong hydrogen bonds with copper atoms.

• Zinc atoms prevent the layers of copper atoms from sliding over each other.

• Zinc atoms prevent electrons from moving freely in the sea of electrons.

• Zinc atom contributes more electrons to the sea of electrons.

Silicon carbide, SiC, is an example of advanced ceramic which can be used to make

• car brakes

• window panes

• electrical cables

• water tanks

All electronic devices can be connected to the Internet via computer networks. What material is most suitable to make the cables?

• Aluminium

• Copper

• Optical fibre

• Fibre glass

What type of glass is formed when calcium carbonate is heated with silicon dioxide?

• Fused glass

• Borosilicate glass

• Lead crystal glass

• Soda lime glass

The following are the characteristics of substance needed to produce a new product in industry.

• No electrical resistance

• Function under the extremely low temperature

• Transfer information with high speed

What are the substances that can be used to produce the product?

I Ceramic

II Superconductor

III Fibre optic

IV Fibre glass

• I and III only

• I and IV only

• II and III only

• II and IV only

Diagram 1 shows several products of a substance. Which of the following is the substance?

• Optic glass

• Fused glass

• Fibre glass

• Photochromic glass

Ceramic is suitable to be used for making engine block because ceramic ...

• is inert towards chemical substances.

• is a good electrical insulator.

• can withstand high temperature.

• can withstand strong compression.

Which pair is matched correctly between and the major component?

• Brass, Copper

• Pewter, Zinc

• Bronze, Tin

• Steel , Carbon

Diagram 2 shows a set of cookware usually used in the kitchen. Which of the following types of glass is suitable for making the cookware?

• Fused glass

• Soda lime glass

• Lead crystal glass

• Borosilicate glass

Which of the following item is made from this alloy?

Material | Composition

Iron 74 %

Chromium 18 %

Carbon 8 %

(SPMRSM 2020, Q33)

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