The gas-phase reaction A2(g)+B2(g)→2 AB(g)A2(g)+B2(g)→2 AB(g) is assumed to occur in a single step. Two experiments were done at the same temperature inside rigid containers. The initial partial pressures of A2 and B2 used in experiment 1 were twice the initial pressures used in experiment 2. Which statement provides the best comparison of the initial rate of formation of AB in experiments 1 and 2? a.) The initial rate of formation of AB is the same in both experiments because they were done at the same temperature and the frequency and energy of the collisions between A2 and B2 would have been about the same. b.) The initial rate of formation of AB is slower in experiment 1 than in with experiment 2 because at the same temperature, a higher pressure would reduce the volume available for A2 and B2 molecules to achieve the proper orientation for a successful collision.     c.) The initial rate of formation of AB is faster in experiment 1 than in experiment 2 because at a higher pressure the collisions between A2 and B2 molecules would have been more frequent, increasing the probability of a successful collision. d.) The initial rate of formation of AB is faster in experiment 1 than in experiment 2 because at a higher pressure a larger fraction of the A2 and B2 molecules would have the minimum energy required to overcome the activation energy barrier. The initial rate of formation of A B is faster in experiment 1 than in experiment 2 because at a higher pressure a larger fraction of the A 2 and B 2 molecules would have the minimum energy required to overcome the activation energy barrier.

Chlorine monoxide (ClO) accumulates in the stratosphere above Antarctica each winter and plays a key role in the formation of the ozone hole above the South Pole each spring. Eventually, ClO decomposes according to the equation: 2C1O (g) → Cl2 (g) + O2 (g) The kinetics of this reaction were studied in a laboratory experiment at 298K, and the data are shown in the table below. (a) Determine the order of the reaction (b) Determine the rate law expression (c) Determine the value of the rate constant, k, at 298K. Time (ms) [CiO] (M) In [ClO] cioj (M-1) [CiO] 6.67 × 107 1.39 x 108 -8- 1.50 x 10 7.19 x 10 4.74 × 10 -18.0 6- 10 -18.8 6- 20 -19.2 2.11 x 108 6- 30 3.52 х 10° -19.5 2.84 x 108 6- 40 2.81 x 10 -19.7 3.56 x 108 6- 100 1.27 x 10 -20.5 7.87 x 108 10 200 6.60 x 10- -21.1 1.52 x 10°

Consider the hypothetical reaction A(g)  +  B(g)                  C(g) The four containers below represent this reaction being run with different initial amounts of A and B. Assume that the volume of each container is 1.0L. The reaction is second order with respect to A and first order in respect to B. Which of the containers, W,X,Y or Z, would have the greatest reaction rate? Justify your answer.

Peroxynitric acid (HOONO2) is an unstable molecule that decomposes to nitric acid and oxygen: 2HOONO2(aq) → 2HNO3(aq) + O2(g)When the concentration of peroxynitic acid is graphed against time, the resulting plot is curved, but if the logarithm of this concentration is plotted, we instead get a straight line. Based on this, which statement is true? a)  This decay is a second order in peroxynitric acid. b)  The slope of the straight-line graph is the rate constant. c)  One needs the concentration of peroxynitric acid to calculate its half-life. d)  The rate law appears to be of the form -Δ[HOONO2]/Δt = k[HOONO2].

b Sulfuryl chloride undergoes first-order decomposition at 320.°C with a half-life of 8.75 h (k = 2.20 x 10-5 s1). So,Cl2(g) → SO2(g) + Cl2(g) If the initial pressure of S02CI2 is 791 torr and the decomposition occurs in a 1.25-L container, how many molecules of SO2CI, remain after 11.7 h? molecules SO2CI2

Suppose the formation of nitrogen dioxide proceeds by the following mechanism: elementary reaction 2NO (g) → N₂O₂ (g) step 1 2 N₂O₂(g) + O₂ (g) Write the balanced chemical equation for the overall chemical reaction. Write the experimentally- observable rate law for the overall chemical reaction. 2NO₂ (g) Suppose also k₁ « k₂. That is, the first step is much slower than the second. << Note: your answer should not contain the concentrations of any intermediates. rate constant 0 k₁ k₂ rate = k 1-0 010 X S