Symbols, formula and equation 2

CHEMISTRY  SSS1 Second Term

WEEK 5

Symbols, formula, and equation 2

Performance Objectives

The student should be able to:

1. State the law of multiple proportion
2. State the law of constant composition
3. Balance chemical equation

Content

Law of multiple proportion

The law of multiple proportions, also known as Dalton’s law, was proposed by the English chemist and meteorologist John Dalton in his 1804 work, A New System of Chemical Philosophy. It is a rule of stoichiometry. The law, which was based on Dalton’s observations of the reactions of atmospheric gases, states that when elements form compounds, the proportions of the elements in those chemical compounds can be expressed in small whole-number ratios.

For example, the reaction of the elements carbon and oxygen…