CHEM 1330H Study Guide - Midterm Guide: Electromotive Force, Spontaneous Emission, Spontaneous Process
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What is oxidizing agent? what is the reducing agent? ex. Mno4- is the answer but people just saying oxygen [which is incorrect] Whether media is basic (extra step add oh-) or acidic (add h+) given on exam. Instead of exam, but for hw: physical properties. Amount of e- an element has gained or lost ex. Zn2+ oxidation state & charge = +2 ex2. Cl"s oxidation state must be -1 to make it neutral ex3. Takes e- from the substance being oxidized and therefore is reduced. Gives e- to the substance being reduced and therefore is oxidized. Zn(s) + 2h+(aq) zn2+(aq) + h2 (g) Zn zn2+ + 2e- oxidation half-reaction. Balance the atoms and charges in each half-reactions. Balance the charges by adding e- [to the overall pos. side] (reduction) 14h+ + cr2o72- + 6e- 2cr3+ + 7h2o. Find lcm between e- in reductions and oxidation half-rxns. 2i- i2 + 2e- (oxidation) (reduction) 14h+ + cr2o72- + 6e- 2cr3+ + 7h2o.
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