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Law of Conservation of Mass
- Antoine Lavoisier
- Matter is neither created nor destroyed.
- Total mass of reactants=total mass of products
Law of Definite Proportions
- Joseph Proust
- All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements.
Law of Multiple Proportions
- John Dalton
- When two elements (call them A and B) form two different compounds, the masses of B that combine with 1 g of A can be expressed as a ration of small whole numbers.
Dalton's Atomic Theory
- Matter is indivisible particles.
- 1. Each element is composed of tiny, indestructible particles called atoms
- 2. All atoms of a given element have the same mass and other properties that distinguish them from atoms of other elements.
- 3. Atoms combine in simple, whole-number ratios to form molecules of compounds.
- 4. In a chemical rxn atoms of one element cannot change into atomos of another element, they simply rearrange.