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The Nucleus: A Chemist’s View

The Nucleus: A Chemist’s View. Chapter 20 E-mail: benzene4president@gmail.com Web-site: http://clas.sa.ucsb.edu/staff/terri/. The Nucleus: A Chemist’s View. 1. Supply the missing particle for each of the following nuclear reactions: a. 73 Ga  73 Ge + ? b. 192 Pt  188 Os + ?

lillian-daugherty
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The Nucleus: A Chemist’s View

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  1. The Nucleus: A Chemist’s View Chapter 20 E-mail: benzene4president@gmail.com Web-site: http://clas.sa.ucsb.edu/staff/terri/

  2. The Nucleus: A Chemist’s View 1. Supply the missing particle for each of the following nuclear reactions: a. 73Ga  73Ge + ? b. 192 Pt  188Os + ? c. 205Bi  205Pb + ? d. 241Cm + ?  241Am

  3. The Nucleus: A Chemist’s View 2. Write an equation for each of the following: a. 68Ga undergoing electron capture b. 62Cu undergoing positron emission c. 212Fr undergoing alpha decay d. 129Sb undergoing beta decay

  4. The Nucleus: A Chemist’s View 3. The radioactive isotope 247Bk decays by an alpha and beta series ending in 207Pb. How many alpha and beta particles were emitted in the series? What is the daughter nucleus if 242U underwent a decay series producing 4 alpha and 3 beta particles?

  5. The Nucleus: A Chemist’s View 4. The only stable isotope of fluorine is fluorine-19. Predict possible modes of decay for fluorine-21 and fluorine-18.

  6. The Nucleus: A Chemist’s View 5. The first atomic explosion was detonated on July16, 1945. What fraction of the strontium-90 (t1/2= 28.8 yr) will remain as of July 16, 2014?

  7. The Nucleus: A Chemist’s View 6. The sun radiates 3.9 x 1023 J of energy into space every second. What is the rate at which mass is lost from the sun?

  8. The Nucleus: A Chemist’s View 7. A freshly isolated sample of 90Y was found to have an activity of 9.8×105 disintegrations per minute at 1:00 pm on December 3, 2000. At 2:15 pm on December 17, 2000, its activity was redetermined and found to be 2.6×104 disintegrations per minute. Calculate the half-life of 90Y.

  9. The Nucleus: A Chemist’s View 8. Phosphorus-32 is a commonly used radioactive nuclide in biochemical research. The half-life of phosphorus-32 is 14.3 days. What mass of phosphorus-32 is left from an original sample of 175 mg of Na332PO4 after 35.0 days? Assume the atomic mass of 32P is 32.0.

  10. The Nucleus: A Chemist’s View 9. A rock contains 0.688 mg of 206Pb for every 1.000 mg of 238U present. Calculate the age of the rock (t1/2 = 4.5x109yr). Assume that no lead was present in the original rock.

  11. The Nucleus: A Chemist’s View 10. The most stable nucleus in terms of binding energy per nucleon is 56Fe. If the atomic mass of 56Fe is 55.9349 amu, calculate the binding energy per nucleon for 56Fe. (neutron = 1.67493 x 10-27 kg, proton = 1.67262 x 10-27kg, electron = 9.10939 x 10-31 kg)

  12. The Nucleus: A Chemist’s View 11. A positron and an electron annihilate each other upon colliding, thereby producing energy in the form of 2 photons. Calculate the wavelength of the light produced. (mass of an electron = 9.10939 x10-31kg)

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