Discussion12_ch19_081210_Answer

Discussion12_ch19_081210_Answer - -2/day All radioactive...

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CHEM102 Discussion Class 12 (Chapter 19) Nuclear Particles (1) Write down notation for an atom with (a) 2 protons and 2 neutrons (b) 15 protons and 17 neutrons (c) 45 protons and 60 neutrons (d) 92 protons and 146 neutrons (e) Po-212 (f) H-1 (g) C-13 (2) Write down notation for (a) a proton (b) a neutron (c) an electron (d) a positron Nuclear Equations (3)Write a nuclear equation for the (a) α decay of Am-241 (b) α decay of Po-210 (c) β decay of Sr-90 (d) γ emission of Tc-99 (4) Write a nuclear equation for the (a) positron emission of C-11 (b) positron emission of I-121 (c) electron capture of Al-26 (d) electron capture in the nuclide made following α decay of Sc-44 Radioactive Decay Kinetics
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(5) What is the half life of an element that has a radioactive rate constant k of 1.48x10
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Unformatted text preview: -2 /day? All radioactive processes occur by first order kinetics. Hence, (6) How many atoms of U-236 remain after (t 1/2 = 2.30x10 7 years) 10,000 years if the initial sample contains 1.00x10 12 atoms? (7) A sample of human skull shows a C-14 / C-12 ratio of 95.6% of that of a living skull. How old is the skull? (t 1/2 C-14 = 5730 years) (8) I measure the α particle emission from a radioactive element as 1.02x10 3 /s. I measure it again 24.0 hours later and find it has decreased to 8.52x10 2 /s. What is the half-life of the element? (9) A smoke detector is considered unreliable when 10% of its 0.20ug sample of Americium-241 has decayed. How long will this take if the half-life for Am-241 is 432 years?...
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This note was uploaded on 09/25/2010 for the course CHEM 123 taught by Professor Piao during the Spring '10 term at Aarhus Universitet.

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Discussion12_ch19_081210_Answer - -2/day All radioactive...

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