CHY 123 Chapter Notes - Chapter 1: Dmitri Mendeleev, Potassium Iodide, Potassium Nitrate

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17 Nov 2015
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Mass is neither created nor destroyed in chemical reactions. Aqueous solutions of mercury nitrate and potassium iodide will react to form a precipitate of mercury iodide and aqueous potassium nitrate. Dmitri ivanovich mendeleev in 1869 invented the periodic table. Periodic table: based on periodic law: when all elements are arranged in order of increasing atomic numbers, elements with similar chemical properties will occur at regular intervals. Metalloid: elements to the left and the middle. The mass of the atom is primarily in the nucleus: contains protons and neutrons with electrons flying about. Because the actual mass of an atom is so small, a unit called the atomic mass unit is used. All atomic weights on the periodic table are expressed as amu"s. Atomic mass unit (amu): a mass unit equal to exactly 1/12 the mass of a carbon atom. Molecular mass: the sum of the atomic masses of all atoms in a molecule of substances, based on molecular formula.

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