Name:  ______________________                                                                            period:  _____
Ch. 21 & 14 nuclear chemistry & kinetics  test           [65 points]                               honors chemistry
For problems involving calculations, show the relevant equation (or formula and conversion factor(s)), show your work in an organized manner, put the proper units in your calculations/ answer, and 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.  Fill-in the blank for the following (hypothetical ?) nuclear reactions.  [15 points]

a.  210 Pb  ->  4 He  +  ______

b.  The beta decay of 32 P is expressed as  ___________________________

c.  29 Al undergoing positron emission is expressed as  _____________________________

d.  4 He  +  15 N  ->   _____

e.  240 U  ->  3 neutrons  +  140 Ba  +  ____

2.  14 C has a half-life of 5.83 * 103 years.  A sample currently has 15 mCi 14C, but originally had 85 mCi  14 C  [Ci = Curie = 3.8 * 1010 isotopes disappear / second].  What is the age of the sample ?  [10 points]


a.  In the reaction:  C3 H8   +  O2   ->  CO2   +  H2 O,  if  d CO2 / dt , then what is __ ?  [15 points]

b.   dO2/dt

c.  dH2O / dt

d.  Rate of the reaction


3.  Based on the following (hypothetical ?) experimental data

Expt

[N2 ]  (M)

[H2 ]  (M)

Rate  (mM / sec)

1

1.0

1.0

1.0

2

1.0

2.0

2.0

3

2.0

1.0

4.0

for  the reaction:  N2  +  H2   ->  NH3 .  What is the rate law of the reaction (include the value of the exponents & rate constant, including its units) ?  [15 points]

5.   A reaction generates 35 kJ / mole of heat under constant pressure conditions and the activation energy of the forward reaction is 45 kJ /mole.   [10 points}

a. Sketch / label the reaction energy profile based on the preceding information

b.  Determine the activation energy of the backward reaction