SAT Subject Test Chemistry,10 edition

(Marvins-Underground-K-12) #1
arrow   is  indeed  balanced.   To  find    the number  of  neutrons,   solve   for x   in  the last
equation (arrow):

So there are two neutrons produced in this reaction. These neutrons are free to go on and be
absorbed by more ^235 U and cause more fissioning, and the process continues in a chain reaction.
Note that it really was not necessary to know that the intermediate state was formed.


Some radioactive nuclei may be induced to fission via more than one decay channel or decay mode.
For example, a different fission reaction may occur when uranium-235 absorbs a slow neutron and
then immediately splits into barium-139, krypton-94, and three more neutrons with no
intermediate state:


RADIOACTIVE DECAY


Radioactive decay is a naturally occurring spontaneous decay of certain nuclei accompanied by the
emission of specific particles. It could be classified as a certain type of fission. Radioactive decay
problems are of the following general types:


BASIC CONCEPT


The parent  nucleus undergoes   radioactive decay   to  produce the daughter    nucleus.

Isotope Decay Arithmetic and Nucleon Conservation


The integer arithmetic  of  particle    and isotope species
Radioactive half-life problems
The use of exponential decay curves and decay constants
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