Formative Practice 9.1 – Form 4 Science (KSSM) Chapter 9

Question 1:
Give two examples of alloy containing copper metal.

Bronze / Brass / Duralumin

Question 2:
Draw the arrangement of atoms in an alloy and a pure metal, then relate the arrangement of the atoms to the properties of pure metal.


Pure metal: atoms in the pure metal are arranged in an orderly manner and in layers. The layer of atoms in pure metal easily slides over each other when a force is applied.

Alloy: The difference in size of foreign atom disrupts the orderly arrangement of metals. The layer of atoms in alloy is difficult to slide over each other when a force is applied. Therefore, alloy is harder.

Question 3:
What alloy is used to make the body of an aeroplane? Explain why the alloy is chosen.


Duralumin is strong, light and resistant to corrosion.

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