Chapter 9 Science Form 4

Why is duralumin used to build the body of an aeroplane?

• Soft

• Light

• Shiny

• Ductile

Leela noted that her gold earrings are soft and easily bent. How does the goldsmith help her to solve the problem?

• Redesign her earrings

• Melt it and add other elements to it

• Increase the gold content

• Purify the gold

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

This type of alloy is said to be very strong, hard and resistant to corrosion. This alloy is used in the construction of bridges and building structures. What are the elements in this alloy?

• Copper and zinc

• Copper and tin

• Iron and carbon

• Aluminium, magnesium and copper

Tags

NGSS.HS-PS2-6

Joining many small molecules together in a long chain to form a very large molecules.

What is the process?

• Condensation

• Hydrolisis

• Polymerisation

• Depolymerisation

Which of the following shows that pure metal is softer than an alloy?

• It is used to make wires from sheets

• It is used to make the body of a vehicle that is able to fly in the air

• It is used to make attractive musical instruments and trophies

• It is used to make pots and pans that can be heated easily