CAIE IGCSE Chemistry 9.3 Alloys and Their Properties Topic Practice

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Covered syllabus points

9.3.1—An alloy as a mixture of a metal with9.3.2—Alloys can be harder and stronger than9.3.3—Uses of alloys in terms of their9.3.4—Representations of alloys from9.3.5—Alloys can be harder/stronger than

Question 1

[Maximum number: 1]

Cupronickel is used to make coins.

The arrangement of atoms in cupronickel is shown.

Figure for Question 1 — CAIE IGCSE Chemistry

Which kind of substance is cupronickel?

A

an alloy

B

an isotope

C

a compound

D

a transition element

Question 2

[Maximum number: 1]

Which statement about alloys is correct?

A

Alloys are pure metal elements.

B

At least two or more metals react together to make alloys.

C

Alloys can be harder and stronger than a pure metal.

D

Steel is not an alloy because it can contain the non-metal carbon.

Question 3

[Maximum number: 1]

Which statement about metals and their uses is correct?

A

Aluminium is used in the manufacture of aircraft because it has a high density.

B

Copper is used to make cooking utensils because it is a poor conductor of heat.

C

Mild steel is used to make car bodies because it is brittle and breaks easily.

D

Stainless steel is used to make cutlery because it is resistant to corrosion.

Question 4

[Maximum number: 1]

Which diagram represents the arrangement of atoms in an alloy?

A
Figure for Question 4 — CAIE IGCSE Chemistry — Option A
B
Figure for Question 4 — CAIE IGCSE Chemistry — Option B
C
Figure for Question 4 — CAIE IGCSE Chemistry — Option C
D
Figure for Question 4 — CAIE IGCSE Chemistry — Option D

Question 5

[Maximum number: 1]

Steel is an alloy of iron.
Which statement explains why steel is stronger than iron?

A

Steel contains carbon which is a very hard substance.

B

The carbon atoms in steel bond together very strongly.

C

The carbon atoms in steel make the iron atoms bond together very strongly.

D

The carbon atoms prevent layers of iron atoms from sliding over each other.

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