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simplified chemistry – atoms notes (cards)

ATOMS

THREE POSTULATES OF DALTON’S ATOMIC THEORY

1) An element is composed of identical atoms.

2) Atoms of different elements have different properties.

3) Compounds are atoms of 2 or more elements chemically combined.

THE LAW OF CONSERVATION OF MASS

During a physical change or reaction, or a chemical reaction, matter is neither created nor destroyed.

(Lavoisier – 1777)

THE LAW OF DEFINITE COMPOSITION

A compound always contains…

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