Chem1202PReviewCh14

Chem1202PReviewCh14 - Chemistry 1202 Review/Preview Chapter...

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Chemistry 1202 Review/Preview Chapter Fourteen Review Guide Dr. Saundra McGuire Spring 2007 Director, Center for Academic Success Adj. Prof., Dept. of Chemistry I. Factors that Affect Reaction Rates Many things determine how rapidly a chemical reaction will occur. The four factors that we can change that will speed up or slow down a reaction are the state of the reactants (solid, liquid, gas, powdered solid), the concentration of the reactants, the temperature at which the reaction is occurring, and whether or not there is a catalyst present. (Read section 14.1 for a description of how these factors influence the rates of chemical reactions.) II. Reaction Rates A. Reaction Rate is defined as the change in the concentration of a reactant or product with respect to time. For a general reaction A ----> B, rate = - [A] = [B] t t B. Reaction Rates and Stoichiometry The coefficients in the balanced equation must be taken into consideration when discussing reaction rates. For example, in the reaction 2A ------> B, rate = -1 [A] = [B] 2 t t This relationship could also be written rate = - [A] = 2 [B] t t II. Concentration and Rate; Determination of a Rate Law A. The differential form of the rate law (usually just called the rate law) relates the rate of a reaction to the rate constant and the concentrations of the reactants. For the general reaction aA + bB ---> cC + dD, rate = k[A] m [B] n , where m and n are experimentally determined. To determine the value of m and n, consider the power to which the change in concentrations must be raised in order to obtain the rate change. The power to which the change in [A] must be raised is the value of m, and the power to which the change in [B] must be raised is the value of n.
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This note was uploaded on 03/23/2011 for the course CHE 1201 taught by Professor Staff during the Summer '09 term at UC Davis.

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Chem1202PReviewCh14 - Chemistry 1202 Review/Preview Chapter...

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