1. A - B is first order. Determine the rate constant. (A) 0.23 s1 (B) 1.0 51 (C) 0.17s (D) 0.12s1 (E) -0.12 Time (8) CA (M) 0.00 1.22 6.00 0.61 12.0 0.31 18.0 0.15 2. The concentration of SO2(g) was monitored to measure the progress for the following reaction: 250 (E)-250(g) + O2(8) What is the half-life (ty) of this reaction in seconds? (A) 10 (B) 30 (C) 20 Time (s)[SO:] (mol/L) 0.0 0.526 10.0 0.418 20.0 0.331 30.0 0.263 40.0 0.209 50.0 0.166 60.0 0.132 (D) 40 (E) 60 3. The rate law for the reaction A + 2B + C + D is rate = k[A]2. Which of the following mechanisms is acceptable for this reaction? (A) step 1 A+ A-E+D (slow) step 2 E + 2B-C+A (fast) (B) step 1 A+BE+C (slow) step 2 E+BD (fast) (C) step 1 A+ A+E+D (fast) step 2 E +2B-C+ A (D) step 1 A+ A+BE+C (slow) step 2 E+CD+F step 3 FC (fast) (slow) (fast)