BLG 143 Chapter Notes - Chapter 2: Electron Shell, Ionic Bonding, Hydrogen Bond
15 Nov 2013
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Document Summary
2 water and carbon-the chemical basics of life. Ions, atoms and molecules all matter is 96% hydrogen, carbon, oxygen and nitrogen: dalton-a unit ot represent mass of proton, neutron and electron in grams. Ion-an atom or molecule that carries charge: two types of ions, cations-positively charged ions, anions-negatively charged ions. When an ionic bond is formed, electrons are completely transferred from one atom to another. As a result, the atom donating its electron gains a positive charge and becomes a cation. Representing molecules: molecular formulas-no. and type of atoms in a molecule. Structural formulas-indicate which atoms are bonded together and whether the bonds are single, double or tripls-good for planar molecules: ball and stick models-provide information on 3d structures of molecules, also indicate the relatives sizes of atoms involved. Space filling models-difficult to read but accurately depict the spatial relationships between atoms: when a chemical reaction occurs, one substance is combined with other or broken down into another substance.
