FORMULAE AND EQUATIONS
CHEMICAL FORMULAE
Chemical formula can be defined as a collection of two or more symbols to represent one molecule of the compound. For example, the formula of tetraoxosulphate(VI) acid is H2SO4. This formula shows that in a molecule of tetraoxosulphate(VI) acid, there are two atoms of hydrogen, one atom of sulphur and four atoms of oxygen.
The table below contain examples of compounds with their formulae
EVALUATION
Write the chemical formulae of the following:
(1) Sodium oxide, Calcium oxide, aluminium oxide,
(2) Carbon(IV) oxide, iron(II) oxide, copper(I) oxide
(3) Sodium tetraoxosulphate(VI), Calcium trioxonitrate(V), magnesium trioxocarbonate(IV).
CHEMICAL EQUATIONS
Chemical reactions are represented in form of equations which show the reactants and products in any given chemical reaction. For example, the reaction of aqueous hydrogen chloride and aqueous sodium hydroxide is represented by the equation:
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
Balancing Chemical Equations
All chemical equations must be balanced in order to comply with the law of conservation of mass.
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