1. Big 7 - Chapter 6
Nuclear Reactions

2. Focus Assignment: Read page 343 and answer the following questions. 1
Focus Assignment: Read page 343 and answer the following questions? What country receives the most electric power from fission? 2. What turns the turbines to create electricity in a fission reactor? 3. What comes out of the cooling tower of the fission reactor?

3. Big 7 - Chapter 6.2 – Nuclear Fission and Fusion
Strong Nuclear Force
Nuclear Fission
Mass converted to Energy
Nuclear Chain Reaction
Nuclear Reactions for Energy
Nuclear Fusion
Fusion in the Sun and Stars

4. - + + + + + Strong Nuclear Force
Force that holds protons in the nucleus together. Felt over the distance of three protons. + +
Like Charges Repel
Opposite Charges Attract + - + +
Strong nuclear force causes protons to attract
Less than three protons wide…

5. Elements higher than atomic number 83 always decay
Too many protons and neutrons causes an unstable nucleus and it undergoes nuclear decay
Nuclear Instability
Elements higher than atomic number 83 always decay

6. 235 U + 1n  140 Ba + 93 Kr + 3 1 n + energy 92 56 36 Nuclear Fission
Process of splitting heavy
nuclei into lighter nuclei
(neutrons and energy produced)
2. Is bombarded by a Neutron.
1. Uranium 235
235 U + 1n 
140 Ba + 93 Kr n + energy 92 56 36
3. It splits and produces
4. Barium
6. Releasing three neutrons
7. And a lot of energy
5. Krypton

7. Neutron
Barium
Uranium
Neutron
Energy
Krypton
Neutron

8. E = mc2 4. Mass converted to Energy E = energy m = mass
Total mass of products is less than the reactants. Some mass is turned to energy.
E = mc2
E = energy
m = mass
c = speed of light
One gram of matter, about 20 drops of water is enough energy to power a 100 watt light bulb for 250,000,000 hours or 28,500 years.

9. 5. Nuclear Chain Reaction
A series of continuous fission reactions

10. Barium
Uranium
Krypton

11. 5. Nuclear Reactions for Energy
The heat from a nuclear chain reaction is used to create steam which turns a generator.

12. 6. Nuclear Fusion
A process by which light nuclei combine to form heavier nuclei and release energy.
The mass of a nuclei is always less than its individual components… thus mass is turned to energy.

13. 7. How the sun produces energy
The sun an other stars are a
series of fusion reactions to
produce energy.