CHEM #6 homework (1)

CHEM #6 homework (1) - Module 6 EOC Assignment Part1...

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Module 6 EOC Assignment – Part1 Chapter 23 - 8, 13, 19, 21, 32 Chpt23 #8 Half life provides an easy way to estimate the time required before a radioactive element is no longer a health hazard. Strontium -90, for example, is β-emitter with a half life of 29.1 years. Significant quantities of Strontium -90 were dispersed into the environment in atmospheric nuclear bomb tests in the 1960’s and 1970’s—and from the half life, we know that a little less than half is still around. The health problems associated with Strontium-90 arise because Calcium and Strontium have similar chemical properties. Strontium-90 is taken into the body and deposited into the bone taking the place of calcium. Radiation damage by Strontium -90 in bones has been directly linked to bone- related cancers.
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Chpt23 #13 (a) A X z will represent the missing particle; X z = 3 Li + 2 He – 4 Be = 3 + 2 – 4 = 1 A X= 6 Li + 4 He – 9 Be = 6 + 4 – 9 = 1 ; 1 X 1 corresponds to H = + -→ + 49Be 11H 36Li 24He (b)
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CHEM #6 homework (1) - Module 6 EOC Assignment Part1...

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