Introduction

In previous classes, discussions about the symbols of elements and the formulae of

compounds help in expressing their long names as short-hand notations which forms the language of Chemistry. In this class children will develop the ability to derive the Formula of compounds if symbols of elements/radicals forming the compound and their valencies are known. They will also be able to write chemical equations if the reactants and products and their symbols/ formulae are known to them.

Children will be able to:

recall the symbols of different elements;

derive the formulae of compounds on the basis of valencies of elements and radicals;

write chemical equation of a reaction;

balance chemical equations by applying the law of conservation of mass.

We will be learning the following in this section:

Symbols of elements.

Formulae of compounds.

Chemical equations (from word equations).

Law of conservation of mass.

Balancing simple equations

Relate the law to the balancing of simple equations.

Information gathered from a

chemical equation.

Limitations of a chemical equation:

Catalyst, conditions for the reaction, state of the reactants and products, nature of the chemical reaction are not gathered from the equation