The representation of a substance in terms of symbols of its constituent particles (atoms or ions) is called a chemical formula. eg H2O MgCl2 etc.
Saturday 17 January 2015
Molecular Formula
A chemical formula showing a molecule in terms of its constituent atoms is called a molecular formula. eg H2O is the molecular formula of water.
Molecule is defined as an atom capable of independent existence or group of atoms joined by covalent bond. eg H2 O2 H2O H2SO4 He and Ne etc
Formula Unit
A chemical formula showing ions of an ionic compound (NaCl & KCl etc) or covalent network compound eg SiO2 (silica ) & C ( diamond or graphite ), in simplest ratio is called a formula unit. eg NaCl is the formula unit of ionic compound Sodium Chloride and SiO2 is the formula unit of covalent network compound, Silica.
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