Most Scientists of the 18th Century discovered that:
- Most natural materials are mixtures of pure substances
- Pure Substances are either elements or combinations of elements called compounds
- A given compound always contains the same proportions of the elements. This principle became known as the law of constant composition
Law of Constant Composition - a given compound always has the same composition, regardless of where it comes from
John Dalton
English scientist and teacher
Developed an atomic theory in 1808
- Most natural materials are mixtures of pure substances
- Pure Substances are either elements or combinations of elements called compounds
- A given compound always contains the same proportions of the elements. This principle became known as the law of constant composition
Law of Constant Composition - a given compound always has the same composition, regardless of where it comes from
John Dalton
English scientist and teacher
Developed an atomic theory in 1808