Progressive Exercises ( Chapter 9 : Manufactured Substances in Industry )
Section A : Objective
1. Which of the following shows the arrangement of atoms in an alloy?
A
B
C
D
2. What is the purpose of making alloys?
I
Increase the hardness
II
Avoid corrosion
III
Enhance the appearance
IV
Increase the melting point
A
I and II
C
B
I and III
D
I,II and III
I,II,III and IV
3. Which alloy has the correct composition.
A
B
C
D
Alloy
Duralumin
Bronze
Steel
Pewter
Composition
Aluminium & Ferum
Copper & Carbon
Iron & Magnesium
Tin & Copper
4. The body of the aeroplane is made of alloy. What is the alloy?
A
Pewter
C
Bronze
B
Brass
D
Duralumin
5.
Type of glass
Uses
Soda-lime glass
Window glass, bottle
Fused glass
Ultra violet, UV tube
Borosilicate glass
Laboratory apparatus
Lead crystal glass
Prism, lens
Which of these statements true for the properties of the glass
Glass
Properties
A
Lead crystal glass
low reflection index, low density
B
Borosilicate glass
non heat resistance, breakable
C
Soda-lime glass
long lasting, high melting point
D
Fused glass
good heat resistance, high melting point
1
6. Pure metals are ductile and malleable . The reason is….
A
bondings between atoms are weak
B
atoms can move freely
C
layers of atoms slide easily
D
atoms are orderly and closely packed
7. In reinforced concrete, the concrete is composed with
A
steel rod
C
sand
B
cement
D
crushed stone
8. Which of these ions is used to change the colour of the photochromic glasses?
A
Sodium ion, Na+
C
Calcium ion, Ca2+
3+
B
Iron (III) ion, Fe
D
Silver ion, Ag+
9. Which of these is not an alloy?
A
steel
B
duralumin
C
D
10. The major component of ceramic is
A
silica
C
B
cryolite
D
bauxite
brass
sodium carbonate
silicate
11. The body of the car shown in the diagram below is made of alloy Y. What is alloy Y?
A
B
Steel
Pewter
C
D
Bronze
Magnalium
12. Diagram below shows a deep fry pan.
What type of glass is suitable to make the glass lid?
A
Fused glass
C
Lead crystal glass
B
Soda-lime glass
D
Borosilicate glass
13. Diagram below shows a helmet that is made of substance X.
What is substance X?
A
Fibre glass
B
Fibre optic
C
D
Superconductor
Photochromic glass
2
Section B : Subjective
1. Pewter, bronze, brass and duralumin are examples of alloys.
a) Explain the meaning of alloy.
____________________________________________________________________________________
[1 mark]
b) Give two advantages of alloys
____________________________________________________________________________________
[1 mark]
c) What are the main components of bronze?
____________________________________________________________________________________
[1mark]
d) Draw a labeled diagram to show the arrangement of atoms in bronze.
[2 marks]
e) Draw a labeled diagram to show the arrangement of atoms in brass.
[2 marks]
f) If pewter is compared to tin , which one is harder ? Explain with reference to the arrangement of atoms.
____________________________________________________________________________________
____________________________________________________________________________________
[ 2marks]
Section C : Essay
1.
Sarah could easily bend her bangle which is made of pure metal but she could not
bend her mother’s bangle which is made of its alloy
By using one suitable example, describe a laboratory experiment to show the hardness of the alloy
compared to its pure metal. Explain the difference in hardness of the metal and its alloy in terms of atomic
arrangement.
[10 marks]
3