N UCLEAR C HEMISTRY Chapter 28. N UCLEAR FORCE - WHAT HOLDS THE ATOM TOGETHER Two opposing forces in the nucleus: Electrostatic- proton vs proton repulsion.

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Presentation transcript:

N UCLEAR C HEMISTRY Chapter 28

N UCLEAR FORCE - WHAT HOLDS THE ATOM TOGETHER Two opposing forces in the nucleus: Electrostatic- proton vs proton repulsion Strong nuclear force-nucleons attracting each other The strong nuclear force holds the protons and neutrons together, but acts over small distances

W HAT IS RADIOACTIVITY Change in the atoms nucleus An atom can spontaneously emit particles An atom that emits radiation is radioactive Radiation is the particles that the atom emits Occurs in unstable isotopes

D ECAY Radioactive decay The process in which the unstable isotope loses energy in the form of radiation Atoms emit radiation to become more stable.

T YPES OF RADIOACTIVE DECAY Alpha-composed of 2 protons and 2 neutrons, +2 charge, Stopped by paper, skin, etc. Beta-composed of a fast moving electron, with a -1 charge Stopped by aluminum foil Gamma- high energy particle, no mass, released with other radiation, never alone Stopped by Lead Alpha (  ) 4 2 He beta (  – ) 0 –1 e Gamma 

M ASS AND ENERGY Einstein suggested that mass and energy are related by E=mc 2 (c = 3.0 x 10 8 m/s) E: energy, m: mass, c: speed of light Converting the mass of one penny could provide the entire energy requirements for 700 people for one year Power a space heater for 7000 years That’s about $3 million worth of electricity Because mass and energy are related the law of conservation of energy and law of conservation of mass can be combined into the Law of Conservation of Mass - Energy

F ISSION AND F USION Two types of nuclear reactions are fusion and fission Fission is when a nucleus breaks apart Fission is used in nuclear power plants and powered the first atomic bomb (21 kilotons) Fusion involves adding nucleons to a nucleus Fusion powers stars and may also be used in thermonuclear bombs (60 megatons) Fusion requires that the nucleons be close enough so that the “strong force” can form

F ISSION Fission Fission chain (nuclear reactors)

FUSION

H ALF -L IFE The amount of time it takes for half the material to decay. After 1 half life half of the original material remains, after 2 half lives 25% of the original material remains, after 3 half lives 12.5% remains. Calculated as Amount remaining=(initial amount)(1/2) n n=number of half lives Amount remaining =(initial amount)(1/2) t/T t=elapsed time T=duration of half lives

D RAW A TABLE COMPARING, ALPHA, BETA AND GAMMA Pg. 844 All three questions Section Review 28.1 AlphaBetaGamma Name Symbol Composition Mass Charge Shield

C OMPLETE S ECTION R EVIEW 28.1 Pg. 844 All three questions