Chemistry, 27.07.2019 02:30 greeneashlynt
Sr-90 is a radioactive isotope that is a major product of an atomic bomb explosion. it is not found naturally in nature. it has a half-life of 28.1 years a) determine k for the first order radioactive decay b) calculate the fraction of sr-90 that remains after 10 half-lives. c) calculate the time required for 99.3% of sr-90 to disappear. d) sr-90 is linked to bone cancer in persons who have lived near a nuclear event. why? e) a sample of bone tissue was unearthed at a crime scene was analyzed for sr-90. it was found that the bone sample contained 21.67% of a similar sample of bone from a person alive today in the area where the fragment was found. estimate the point in time when the person died another bone fragment was analyzed for sr-90. there was no sr-90 found in the bone. assuming that the analytical method used to analyze for sr-90 is accurate to the atomic level (yes, such a method exists), what can be said about the minimum age of the bone fragment
Answers: 2
Chemistry, 22.06.2019 00:00, aubreymoore9441
For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have
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Chemistry, 22.06.2019 04:00, queenkimm26
Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?
Answers: 3
Chemistry, 22.06.2019 10:50, lejeanjamespete1
8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm
Answers: 1
Sr-90 is a radioactive isotope that is a major product of an atomic bomb explosion. it is not found...
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