10/20/2011
1
Chapter 7:
The Fires of
Nuclear Fission
(continued)
Oct. 21/2011
Review of Last Lecture
•
Strategies for reducing global warming?
•
E=mc
2
•
Definition of fission
•
Difference between chemical and nuclear
reactions
2
Nuclear Equations, Examples
1) U
‐
235 fissions to form Ba
‐
138, Kr
‐
95 and n
0
2) U
‐
235 fissions to form an element (
Z
=52,
A
=137) another element (
Z
=40
A
=97) and n
0
=137), another element (
=40,
3) U
‐
235 fissions to form Xe
‐
143 and another
element (
A
=90,
Z
=?) and n
0
3
Nuclear Equations
•
Notice that
both sides contain neutrons,
why
not
cancel
them out?
n
3
Kr
Ba
U
n
1
0
92
36
141
56
235
92
1
0
+
+
→
+
•
On the
left,
the neutron:
•
On the
right,
neutrons:
4
Kr
n

This
** preview**
has intentionally

**sections.**

*blurred***to view the full version.**

*Sign up*