Chapter 19 – Nuclear Chemistry
97.
Select True or False: The type of nuclear process illustrated below is called electron capture.
98. Determine the decay rate for a radioisotope sample with an activity of 12 microcuries. [1
curie = 3.7 1010 disintegrations/s]
Chapter 19 – Nuclear Chemistry
99. Tritium is a radioisotope of hydrogen having a half-life of 12.3 years. If you initially had
1.0 10–7 mole of tritium, calculate the decay rate of the sample.
100. Tritium is a radioisotope of hydrogen having a half-life of 12.3 years. If you initially had
1.0 10–7 mole of tritium, how many moles of tritium would be left after 78 years?
Chapter 19 – Nuclear Chemistry
101.
Complete and balance the equation
Chapter 19 – Nuclear Chemistry
102.
Complete and balance the equation
Chapter 19 – Nuclear Chemistry
103.
Balance the equation
Chapter 19 – Nuclear Chemistry
104.
Select True or False: In order to balance the equation an alpha particle must be added to
the right side.
Chapter 19 – Nuclear Chemistry
105.
Complete and balance the equation
106. Radioactive nitrogen-13 has a half-life of 10 minutes. After 40 minutes, how much of
this isotope would remain in a sample that originally contained 96 mg?
107. Protactinium-234 has a half-life of 1 minute. How much of a 400. g sample protactinium
would remain after 2 minutes?
Chapter 19 – Nuclear Chemistry
108. Protactinium-234 has a half-life of 1 minute. How much of a 400. g sample protactinium
would remain after 4 minutes?
109.
Select True or False: The blood volume of a patient can be measured by using chromium-51, a positron emitter, administered
as a solution of sodium chromate. The nuclear equation for the decay of chromium-51 is:
Chapter 19 – Nuclear Chemistry
110. Strontium-90 has a half-life of 28.8 years. How much strontium-90 was present initially,
if after 144 years 10.0 g remain?
111.
The isotope of iodine with mass number 128 undergoes beta decay with a half-life of 25.00 minutes. The balanced nuclear
reaction for this process is:
Chapter 19 – Nuclear Chemistry
112. The isotope of iodine with mass number 128 undergoes beta decay with a half-life of
25.00 minutes. How long will it take for 93.75% of a sample of pure 128 I to decay?
113. When a 87Br nucleus emits a beta particle, the nuclear species that results is
___________.