CHEM 107 Lecture Notes - Lecture 2: Nicotine, Isomer, Chemical Formula
8 Apr 2016
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Isotopes: chemical behavior of atoms controlled by electrostaic atracion, same number of protons and same number of electrons have essenially same chemistry. Atomic weights: atoms have measurable masses, atomic weight of an element is the average mass of an atom of an element, 1 amu=1. 66x10^-27 kg, average mass of a carbon atom example (1. 66x10^-27kg/amu)*(12. 011amu)=(1. 9945x10^-23g) Molecules and moles: 2 or more atom joined by chemical bonds is a molecule, 1 mole = 6. 02x10^23 ( avogadro"s number , deined by seing 1 mole of c=12g exactly. Mass, moles, and number of molecules: unit conversion, change grams to moles to moles to grams. Represening organic molecules: know the names of molecules, formulas have clues about the structure of atoms, isomer. Same molecular formula and composiion but diferent arrangement of atoms. Formulas and percent composiion: given a chemical formula is easy to calculate percent formula.
