Have you noticed, changes happen everywhere and at all times ? All changes can be divided into two broad categories -Physical and Chemical.
Physical changes are the changes in physical properties that does not produce any new substances. These changes can be reversed like - melting of ice.
New substances are produced due to chemical changes.
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. It is represented by a chemical equation.
Characteristics of chemical reaction include: evolution of gas, change of color, formation of precipitates and change of state.
In this module we'll deal more about the types of chemical reactions, burning and combustion.
A Smart Test on Physical and Chemical Changes
Learnhive Lesson on Physical and Chemical Changes