ch. 19 nuclear chem                test                               40 points                                  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.

1. Write the nuclear reaction describing (hypothetical ?) ___  or fill-in the blank.  [10 points]

a.  Alpha decay of 140Ba:  _______________________________________

b.  Positron emission of 32P:  _______________________________

c. Neutron +  238U  →  2 neutrons  +  135Cs  +  ____ ; it’s an example of ________________  (name of type reaction)

d.  ____  +  17O  →  22Ne;  it’s an example of  _________________________ (name of type of reaction)

e. Beta decay of 14C:  ______________________________

2.  What is the meaning of the equation: E = m c2  ?   [5 points]

3.  Briefly, describe the basis of the atomic bomb.  [5 points]

4. A hypothetical radioactive isotope has a half-life of 23 years; what is the value of its decay constant ?  [5 points]

5. It took 35.0 days for a hypothetical radioactive isotope to decay from 2.5 mg to 575.0 μg.  What is the half-life of the isotope ?   [15 points]