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Ch2QuickhitsHCR

Ch2QuickhitsHCR - Chapter 2 Atoms and the Atomic Theory...

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Click to edit Master subtitle style Chapter 2 – Atoms and the Atomic Theory Antoine Lavoisier (1743-1794) noted that the products of a chemical reaction have the same total mass as the reactants. This is summarized in the Law of Conservation of Mass (1) , which states that matter is not created or destroyed in a chemical reaction. John Dalton (1766-1844) noticed that two elements may combine to form more than one compound. The masses of one element that combine with a fixed mass of the other element are related as small whole numbers. This is the Law of Multiple Proportions(3) . Dalton explained these (1, 2, 3) Laws by proposing that all matter is comprised of tiny, indivisible units called atoms (Atomic Theory) . Atoms of a given element have identical properties. ‘Indivisible’ atoms means that bits and pieces cannot be gained or lost in a chemical reaction (1). A compound is formed when atoms of elements combine in simple whole number ratios (you can’t have pieces of atoms) (2) . Since all atoms of a given
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