CHEM 120 Lecture Notes - Lecture 25: Oxidation State, Anagram, Fluorine

• School: McGill University
• Department: Chemistry
• Course: CHEM 120
• Professor: Laura Pavelka, Samuel Sewall, Pallavi Sirjoosingh

Document Summary

19. 1 chemical change and electrical work redox. Oxidation-reduction (redox) = movement of electrons (e ) from one reactant to another: oxidation is loss of electrons | reduction is gain of electrons. Covalent molecules ( shift e : electrons move from reactant with less attraction for electrons to reactant with more attraction for electrons. Electronegativity = ability of an element to attract bonding electrons: oxidizing agent = causes oxidation in another species (is reduced, reducing agent = causes reduction in another species (is oxidized) In more complex reactions, we need a method to monitor movement of electrons: each atom in a molecule/formula unit is assigned an oxidation number. On of an atom = charge that the atom would have if electrons were transferred completely to/from bonded atoms. Assigning oxidation numbers: elemetal form or monoatomic ion, neutral molecule or complex ion, most common, group 1 +1, group 2 +2, hydrogen +1, fluorine 1, oxygen 2, group 7 1.