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103B Exam 1-B - Exam I master Page 1 Chemistry 103B Exam 1...

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Page 1 Exam I master 4/10/2008 12:19:16 AM http://www.chem.arizona.edu/~kellerp/exams/Exam1/Exam1Ban/Exam1Ban.htm Chemistry 103B Exam 1 Answer Key Form B 1. (2) When a chemical reaction has reached equilibrium (a) the reaction quotient Q has reached a minimum (b) the concentrations of the reactants have become equal to the concentrations of the products (c) the concentrations of the reactants have all reached 0 mol/L (d) the concentrations of reactants and products have reached constant values (e) the forward and reverse reactions have both stopped 2. (2) Shown below are the elementary steps in the mechanism of a gas phase reaction BC(g) B(g) + C(g) ������������������������������������������� �������������� [slow] B(g) + A(g) AB(g) ����������������������������������������� [fast] C(g) + A(g) AC(g) ����������������������������������������� [fast] AB(g) + AC(g) A 2 BC(g) ������������������������������������������� ���� [fast] If more molecules of A are added (a) the rate will increase (b) the rate willbe unchanged
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