Click to edit Master subtitle styleChapter 2 – Atoms and the Atomic TheoryAntoine 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
This is the end of the preview.
access the rest of the document.