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.
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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) 21283Bic) 21482Pb
b) 22286Rnd) 21483Bi
The formation of 23090Th from 23492U occurs by:
An atom of 23892U undergoes radioactive decay by α emission. What is the product nuclide?
Pg. 843 in textbook
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