Chapter 18. Nuclear Chemistry. Introduction. So far we ’ ve studied chemical reactions where only electrons have changed. Chemical properties are determined by electrons! Nucleus was not primarily important in these reactions, as it did not undergo any changes.
Radioactive Decay &
Do not change mass #: particle emitted/used has no mass (mass # = 0).
23892U 42He + 23490Th + 00
2211Na 01e + 2210Ne
20180Hg + 0-1e 20179Au + 00
alpha < beta/positron < gamma ray
Which of the following statements is true about beta particles?
When 22688Ra decays, it emits 2 α particles, followed by a β particle, followed by an α particle. The resulting nucleus is:
a) 21283Bi c) 21482Pb
b) 22286Rn d) 21483Bi
The formation of 23090Th from 23492U occurs by:
An atom of 23892U undergoes radioactive decay by α emission. What is the product nuclide?
1) Is the isotope Ne-18 stable?
2) Is the isotope 126C stable?
3) Is the isotope sodium-25 stable?
Pg. 869 #3, 4, 12, 13, 20
The Kinetics of Radioactive Decay
change in time
100%, 50%, 25%, 12.5%, 6.25%, 3.12%, etc.
to solve for the half life (units will vary
depending on what is given in the problem).
t = 3,600 years
E = (5 x 10-6kg)(3.00 x 108m/s)2
E = 5 x 1011 J