# Kaplan MCAT: Gen Chem 2

 Reaction Rate
 Change in a property per unit time     Rate= Change in concentration         time change to occur
 Rate Laws
 Rate= k [A]x[B]y   exponents (x,y)- orders of reaction; x is the order with respect to A and y is the order with respect to B.    Overall reaction order=x+y
 Equilibrium expresssion for….   H2 (g) + Cl2 (g) <—> 2HCl (g)
 Equilibrium constant is Products over reactants, with order taken into account.     Kc=     [HCl]2         [H2][Cl2]
 Le CHatelier’s Principle
 When a stress is applied to a system at equilibrium, the system will adjust to minimize the effect of stress ; eg. ; N2 + 3H2 ;—->  2NH3 (g)   —what direction would equilibrium shift if additional N2 is added?     would shift towards products (shift right, favoring the production of NH3)
 Le Chatlier’s principle applied to temperature change     A<—-> B + heat    if this system were cooled (eg. placed in an ice bath), which way would the reaction be driven?
 the rxn. temp would decrease, driving the reaction towards products, to replace the lost heat.   If it were heated in boiling water, the rxn would shift left due to increased heat concentration.
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