Nuclear Chemistry. Radioactive Decay Spontaneous breakdown of an atom’s nucleus Breakdown results in a lighter nucleus Emits electromagnetic radiation.

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Presentation transcript:

Nuclear Chemistry

Radioactive Decay Spontaneous breakdown of an atom’s nucleus Breakdown results in a lighter nucleus Emits electromagnetic radiation Nuclear radiation—radiation emitted from nucleus Radioactive nuclide– nucleus that goes through radioactive decay, unstable. (Ex. Uranium

Types of Radioactive Decay 1)Alpha particle (α) Consists of 2 protons, 2 neutrons emitted during decay Helium nucleus ( 2 4 He )—how particle represented Can be stopped by paper, low energy Atomic number goes down 2, atomic mass goes down 4. Equation: Po  Pb He 2)Beta particle (β) Electron given off during radioactive decay Can be stopped by lead or glass Increase in atomic # Equation: 6 14 C  7 14 N β 3)Gamma Rays Has the most energy, only stopped by lead Ex. X-Rays

Example 1: Nuclear equation when an alpha particle emitted by Po

Example 2:Nuclear equation when a beta particle emitted by Pb

Practice: Alpha Decay 1)Be-9 2)U-238 3)Eu-154 Beta Decay 1)Th-234 2)K-43

Half-Life Time period required for half of a radioactive nuclide to decay. Vary depending on the nuclide, unique for each nuclide. Ex C has a half-life of Therefore, if we have 10g of 14 6 C, in 5715 years we will have 5g.

Half-Life Equation A E = A O * 0.5 t/t(1/2) A E = Substance amount A 0 = Initial substance amount t = time elapsed t 1/2 = half-life

Example 1: Plutonium-239 has a half life of 24,110 years. We have 100g of this substance. How many grams will we have after 96,440 years?

More on Nuclear Chemistry

Nuclear Fission Nuclear reaction where nuclei are SPLIT Nucleus is broken down into a more stable nucleus. HUGE amount of energy is released Critical mass = minimum number of nuclei that can provide enough neutrons to maintain chain reaction. Nuclear reactors = controlled fission reactions. **Can induce a nuclear chain reaction!!!

Nuclear Reactors Location where controlled fission reactions occur Fuel rods in the core contain enriched uranium Steam generation steam turbine electric generator Control rods take in neutrons so fission is controlled Production of radioactive waste A TON of water is used to cool the reactors

Nuclear Fusion Nuclei having a light mass are joined. Combination of light nuclei Creates heavy nucleus Results in larger, stable nucleus. MORE energy released than in nuclear fission !!! Hard to control Initiated by fission reaction (fission bomb) ---- H bomb **Type of reaction happening in the sun and stars. -fuel: hydrogen atom

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Applications to Nuclear Radiation 1)Radioactive Dating Age determination of artifact based on presence of radioactive nuclide 2)Medical Purposes Cancer treatments Radioactive tracers 3)Food Processing Meat exposed to radiation Kills microorganisms

Prompt We talked about nuclear energy today. Do you support or disagree with this type of green energy? Support your answer. How could we harness the nuclear energy in the sun? Discuss how we might use nuclear fusion to benefit us.