Nuclear Chemistry

Hiroshima

Nagasaki

Nuclear Fission: splitting of the atom into different parts

Nuclear Fusion:nuclear particles combining releasing energy

How the bomb works

Critical mass

How a Nuclear Power Plant works

Nuclear Decay ParticlesComes out of the nucleus

Alpha:

Beta:

Positron:

Gamma Ray:

Neutron:

Worksheet: balancing nuclear equations

Half-Life Nuclear Decay

Students tear a piece of paper

• 1st half life = ½ ½

• 2nd half life = ¼ ¾

• 3rd half life = 1/8 7/8

• 4th half life = 1/16 15/16

Amount of sample left

Amount of sample gone

Ws.

1. The half-life of polonium-210 is 138.4 days. How many milligrams of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope?

2. Assuming a half-life of 1599 years, how many years will be needed for the decay of 15/16 of a given amount or radium-226?

3. The half-life of radon-222 is 3.824 days. After what time will one-fourth of a given amount of radon remain?

4. A sample contains 4.0mg of uranium-238. After 4.46x109years, the sample will contain 2.0mg of uranium-238. What is the half-life of uranium-238?

5. A sample contains 16mg of polonium-218. After 12 minutes the sample will contain 1.0mg of polonium-218. What is the half-life of polonium-210?

6. If you start with 2.97 x 1022 atoms of Molybdenum-91, how many atoms will remain after 62.0 minutes? The half-life of Mo-91 is 15.49 minutes.

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