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Science PT3 Chapter 4 Reactivity of Metals
Discussion:
(a) Gas released when calcium carbonate is put into the acid and when calcium
carbonate is heated is carbon dioxide gas.
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(b) The word equation for each reaction:
Calcium Hydrochloric Calcium Carbon
(i) carbonate + acid → chloride + dioxide + Water
Heated
(ii) Calcium carbonate Calcium dioxide + Carbon dioxide
(c) Calcium carbonate is a compound made up of calcium, carbon and oxygen.

6. Table 4.3 shows the characteristics of natural minerals and their uses in daily life.
Table 4.3

Natural minerals Chemical / Physical Uses
properties
Calcium oxide Base Neutralises acidic soil
Silicon oxide High melting point To make glass
Calcium carbonate Insoluble in water To make cement
Heavy mineral compared to
Lead(II) sulphide water. Soluble in nitric acid To make batteries, piping

4.2 Reactivity Series of Metals

1. The reaction of metals with oxygen varies according to the types of metals.
2. The metal reactivity series of metals is a list of metals arranged in order of their
reactivity (highest to lowest) towards oxygen as shown in Diagram 4.2.

Metal Symbol
Potassium K Na
Reactivity Series of Metals Calcium Ca oxygen increases
Sodium
Li
Lithium
Mg
Magnesium
Reactivity of
Al
Aluminium
metals towards
Zinc
Zn
Iron
Fe
Tin
Sn
Lead
Copper
Cu
Gold Pb
Ag
Silver Au
Form 3
Diagram 4.2 Reactivity series of metals towards oxygen
Form 3
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