CHEM 1050 Lecture Notes - Lecture 31: Reaction Rate Constant
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6 Apr 2016
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Involves the study of rates: how fast a reacion occurs, and the study of mechanisms: how a reacion occurs. We can determine reacion rates, factors that afect reacion rates, and reacion mechanisms. For almost all chemical reacions, the rate decreases as the reacion proceeds. The concentraion of the reactants never actually reaches zero, but the reacion goes more and more slowly or reaches equilibrium. Measure change in concentraion per change in ime: d[c]/dt. Either decrease in reactants, increase products, or change in pressure for gaseous reactants/products will change rate. Rate is always a posiive number, i. e. [reactant ] Where n is the coeicient of the reactant. Rate depends on the instantaneous concentraions of the reactants. Concentraions are raised to the power corresponding to their order. aa+ bb=cc+ dd rate=k [ a ]x [ b] y. We can not determine x and y by using the chemical equaion-it must be experimentally determined.
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