Chemistry 1212 Lab KSU study guide Exam Questions with Verified Answers

Chemistry 1212 Lab KSU study guide Exam Questions with Verified Answers Using the following information, what are the values of the exponents in the rate expression, rate = k[A]x[B]y initial concentration of A, initial concentration of B, rate Experiment 1: 0.050M, 0.050M, 0.062M/sec Experiment 2: 0.050M, 0.100M, 0.123M/sec Experiment 3: 0.100M, 0.100M, 0.491M/sec - CORRECT ANSWER-x=2, y=1 For the rate expression in the previous question, what is the overall order of the reaction? - CORRECT ANSWER-3 For the following reaction, A + B + C - D + E, the rate expression is first order with respect to reactant A, zero order with respect to reactant B and second order with respect to reactant C. What is the numerical value of the rate constant, k, if the rate = 2.24e-4 mole/lit-min when the [A] = 0.0050M, [B] = 0.250M, and [C] = 0.0112M? - CORRECT ANSWER-3.6e2 What are the units of the rate constant, k, in question 3? - CORRECT ANSWER-L2/minmol2 For the experiment today, which concentrations of S2O82- and I- are used to solve for x, y, and k in the rate expression, rate = [S2O82-]x[I-]y? - CORRECT ANSWER-The initial concentrations of the reactants, S2O82- and I-. The slope is calculated from the graphs as: - CORRECT ANSWER-change in molarity over change in time The effect of a catalyst is to - CORRECT ANSWER-lower the activation energy of a reaction. Which of the following can change the rate of a chemical reaction? 1. temperature 2. reactant concentration 3. catalyst - CORRECT ANSWER-1, 2, and 3 All of the following would be expected to affect the INITIAL rate of a chemical reaction EXCEPT - CORRECT ANSWER-removing some products For the following 10 questions use the following reaction system.