Multiply mass x % for all isotopes.

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Presentation transcript:

Multiply mass x % for all isotopes. Abundance of Isotopes Multiply mass x % for all isotopes. Add them. Strontium consists of four isotopes with masses of: 84 (abundance 0.50%), 86 (abundance of 9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%). Predict the average mass of Strontium. ______ Calculate the atomic mass of strontium.

Half-Life 2 Times (Hint: Solve for # h.l. first!! ) 1. The half-life of cobalt-60 is 5.26 years. How many half-lives have passed in 15.78 years? What % of the sample remains? 2 Amounts (Hint: Solve for # h.l. first!! ) 2. A rock that originally had a mass of 1.00 gram of uranium-238 now has only 0.0625 grams. How old is the rock if the half-live of uranium-238 is 4.5 billions of years. 3. How old is an artifact if 6.25% of C-14 remains in the sample and the half-live of carbon-14 is 5730 years? Find the half-life (1 h.l. = total time) total # h.l. 4. All isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decays to 100.0 g of technetium-99 in 7 hours, what is its half-life?

Nuclear Reactions Subatomic nuclear symbols: ___ proton, ___ neutron, ___ electron Alpha decay (42He, big, slow, stopped by clothes/paper) Beta decay (0-1e, med, med, stopped by Al foil) Positron decay (0+1e, med, med, stopped by Al foil) Gamma decay (00 w/ alpha or beta, small, fast, NOT a particle..it’s energy! stopped by lead/concrete) Write the decay equations for: a. Polonium-210 w/ alpha particle ejected b. Bromine-85 beta decay w/ gamma emitted c. Tin-116 positron decay

Fusion and Fission Nuclear Fusion 1. What happens to the nucleus? 2. What happens to the energy? 3. Is fusion controllable? 4. Name 2 places where fusion happens. Nuclear Fission What happens to the nucleus? What happens to the energy? How does a chain reaction work? Is fission controllable? Name 2 places where fission happens. 9. How does an atomic bomb incorporate fission AND fusion?