1)       For the following reactions, write the rate expression in terms of the appearance or disappearance of product or reactant, respectively (the delta (D) equations

a)        H₂O₂(g)  →  H₂(g) + O₂(g)

b)       2 SO₂(g) + O₂(g)  →  2 SO₃(g)

c)       N₂(g) + 3H₂(g)  →  2 NH₃(g)

d)       4 HBr(g) + O₂(g)  →  2 H₂O(g) + 2 Br₂(g)

2)       The following initial rate data was collected for the reaction of hydrogen iodide with ethyl iodide:

HI(g) + CH₃CH₂I(g)  →  CH₃CH₃(g) + I₂(g)

From the following table of data, determine the rate law and the value of the rate constant.

3)       Consider the following rate expression and then answer the following questions according to how the rate of reaction will change when the concentration changes are made.

2 NO(g) + O₂(g)  →  2 NO₂(g)                   Rate = k[NO]²[O₂]

a)       [O₂] is doubled

b)       [NO] is doubled

c)       [NO] is halved

d)       [O₂] is halved and [NO] is doubled

e)       [NO] is halved and [O₂] is doubled

4)       The civilization on the planet Ecton is endangered by the continual illegal disposal of Klingon hairspray, which is causing the atmosphere to decompose by a first order rate law.  Science Officer Spock has determined that their atmosphere is decomposing with a half-life of 12.50 min-1.  Dr. McCoy, the medical officer, has determined that the Ectonians need a minimum of 6.25% of the original atmosphere to survive.  Meanwhile, Scottie, the chief engineer, is desperately trying to fix the transporter so that the entire Ectonian population can be transported to a safe planet.  You are the acting commander, replacing Captain Kirk, who is on vacation.  How long does Scottie have to repair the transporter?

5)       Consider the reaction of the iodide ion and methyl bromide:

I^- + CH₃Br  →  CH₃I + Br^-

Chemists believe that the only collisions that can result in a reaction ones where the iodide ion approaches the methyl bromide molecule from the side opposite the location of the bromide atom.  Construct a molecular model of methyl bromide and use it to consider how an effective collision can take place.  From your analysis, estimate the fraction of collisions that occur that will have the proper orientation for a successful reaction.

6)       The data below were collected for the reaction between iodide and methyl bromide (see previous question):

a)       Determine the activation energy for this reaction.

b)       This reaction follows the rate law: RATE = k[I^-][CH₃Br].  If the concentration of each reactant is initially 0.100 M, how long will it take for the concentration of the reactants to drop to 0.050 M is the reaction takes place at 273 K? 

c)       A rule of thumb used by chemists is that the rate of a reaction roughly doubles with each ten-degree temperature increase.  Does this reaction follow that rule of thumb?

7)       Draw the following Reaction Coordinate Diagrams:

a)       One-step endothermic reaction in which the forward step is very slow compared to the reverse step.

b)       The same reaction as (a) but with a catalyst added.

c)       Three step endothermic reaction in which the second step is the slow step.

8)       Data on the decomposition of N₂O₅ at 25^oC are:

2 N₂O₅(g)  →  4 NO₂(g) + O₂(g)

a)       Use algebraic methods to determine the order of the reaction and find the value of k (include units).

1^st order relationship:                                                                   2^nd order relationship

b)       Verify your answer in part a using graphical methods to determine the reaction order and value of k.