CAS CH 110 Lecture Notes - Lecture 27: Stoichiometry, Femtosecond, Galvanic Cell
25 Apr 2017
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Document Summary
The specific energy is measured in kilowatt-hours per kilogram, kw h kg-1. A primary cell is a galvanic cell with the reactants sealed and are not rechargeable. Secondary cells are galvanic cells that must be charged before used. These batteries are found in portable computers, cell phones and automobiles. Thermodynamics tells us which way a chemical reaction will go. Kinetics tells us how fast a chemical reaction will go as well has how to control the rate. Chemical rate: changes in concentration over a time interval. Rates can be either an (1) average or (2) instantaneous. The advantage of an (1) average rate is they are easy to calculate. The disadvantage is they tend to be very general, and not exact. The advantage of an (2) instantaneous rate is it give very specific, giving exact information. The disadvantage is the time it takes to setup and make the calculation. The time-scale it takes for an atom to react is approximately.
