CHEM 1032 Lecture Notes - Lecture 28: Stoichiometry
15 Apr 2017
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Types of reactions: all have balancing atoms. Ox oxidation: reduction: gains electrons, oxidation: the loss of electrons, oil rig. 2nacl(s: elements are neutrally charged, compound made of charged ions, na: lost an electron = oxidized, cl: gained an electron = reduced. We track the movement of charge by assigning oxidation states to the atoms. We assign electrons to a specific atom even if they are shared. The oxidation state of an atom in a free element is zero. The oxidation state of a monoatomic atom is equal to its charge. In compounds, the sum of all oxidation states: if a neutral compound, sum = 0 if an ion, the sum of oxidation states equals the charge of ion: 4. Alkaline earth metals: are always +2: 5. In compounds, nonmetals are always assigned in a hierarchy. How to balance a redox reaction in acidic solutions: half-reaction method, 1.
