Topic 9 – Metals and Alloys
National 4
Homework 1
1. Aluminium metal is used to make aircraft, bicycle frames and cooking foil.
For each use please state a property of aluminium that makes it suitable
for that use.
3
2. Name two metals that react quickly with water and oxygen?
1
3. Put the following metals in order of reactivity, starting with the least
reactive:
sodium, copper, calcium, silver, iron, zinc
1
4. Copy and complete this word equation:
potassium + water
potassium hydroxide + ___________
1
5. Many metals have to be extracted from ores. What does the word “ore”
mean?
1
6. Name two metals that have to be extracted from their ores using
electricity?
1
7. Why were gold and silver among the first metals to be discovered?
1
8. Iron is produced from ore by roasting it with carbon in a huge tower.
What is this tower called?
1
(10)
Homework 2
1. What does the word corrosion mean?
1
2. Which two substances have to be present for corrosion to happen?
1
3. Rusting is a special form of corrosion involving the metal iron. What
chemical indicator is used to show that rusting is taking place and
what is the colour change?
2
4. Galvanising is one way of protecting a metal by coating it with another
metal. What metal is used in galvanising?
1
5. Electricity can be produced by connecting different metals together
in an electrolyte solution. This is called a cell and an example is below:
a) Which direction do the electrons flow in the voltmeter above?
1
b) What is the purpose of the electrolyte?
1
c) What energy change happens in the cell above?
1
(8)
Homework 3
1. Several pairs of metals are shown below.
A
B
C
sodium and
magnesium and
magnesium and
gold
zinc
D
E
F
magnesium and
zinc and tin
copper and silver
potassium
calcium
a)
In which pair would neither metal react with dilute acid?
b)
Which pair would give the largest voltage if used to make an
electrochemical cell?
c)
1
1
Which pair are both alkali metals?
1
2. A car wheel manufacturer decided to use a particular mixture of metals
to produce wheels for racing cars. The mixture contained 80%
aluminium, 15% titanium, 4●5% chromium and the rest was nickel.
a) Put the information above into a table with two columns, remember to
put headings in each column.
2
b) What word is used to describe a mixture of metals like this?
1
c) Which of the metals used to make the wheel has the highest atomic
number?
1
d) Which two metals are used to make brass?
1
(8)