kinetics                        test                                           65 points                                                          honors chemistry
           
Show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

Academic Honesty:   The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus.  I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam.  If you violate any of the preceding items or do not sign, your semester grade is a F.

                                                                                                Signature:  ___________________

1. In regards to the reaction:  C2H6  +  O2  →  CO2  + H2O, fill-in the below table; need not show work in this problem.  [16 points]

Rate (mM / sec)

Δ [C2H6] / Δt  (mM / sec)

Δ [O2] / Δt  (mM / sec)

Δ [CO2] / Δt  (mM / sec)

Δ [H2O] / Δt  (mM / sec)

 

2.0

 

 

 

 

 

 

 

 

20.0

 

2. Based upon the below hypothetical experimental data, determine the rate law of the reaction:  N2  +  H2 à  NH3; include the value / units of the rate constant.  [15 points]

Expt

Rate (mM / sec)

[N2]  (M)

[H2]  (M)

1

2.0

1.0

1.0

2

4.0

2.0

1.0

3

4.0

1.0

4.0

3. In regards to the reaction:  N2  +  H2 à  NH3,  [10 points]

a. sketch / label the reaction energy profile

b. what is the value of the activation energy of the forward reaction, if the activation energy of the backward reaction is 125 kJ ? 

4. In regards to a catalyst,   [9 points]

a. What is the effect of a catalyst on the rate of the forward and backward reaction ? 

b. Sketch / label the reaction energy profile to illustrate the effect of a catalyst on a reaction. 

c. Based on the Arrenihius equation, what is the basis of the effect of a catalyst on the rate of the forward and backward reaction ?

3.  Describe the basis / rationale to experimentally determine the activation energy of a reaction using ___.  [15 points]

a. Graphical analysis

b. Algebraic analysis (setup, but do not need to “solve” the equation)

c.  List the experimental data and describe the subsequent calculation / analysis to implement the above method, i.e. how to get the “data” used in the above methods [hint:  prelab question].