A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.  Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!


1. Classification by Structural Change

2. Classification by Reaction Type,i;e Acidity and Basicity                                3. Classification by Functional Group                                                                   4. Reaction Characteristics                                                                               5. Factors that Influence Reactions


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If one element replaces other element in a compound, then it is a single replacement reaction.

In double replacement reactions, two pairs of elements switch their partners.

Synthesis means exactly what it says. A new substance formed from two or more substances.

Decomposition is the breakdown of one substance into two or more substances.