Chemistry, 12.08.2019 19:20 aloading6574
Corals take up certain elements from seawater, including uranium but not thorium. after the corals die, the uranium isotopes slowly decay into thorium isotopes. a measurement of the relative fraction of certain isotopes therefore provides a determination of the coral's age. a complicating factor is that the thorium isotopes decay as well. one scheme uses the alpha decay of ^{234}\rm u to ^{230}\rm th . after a long time, the two species reach an equilibrium in which the number of ^{234}\rm u decays per second (each producing an atom of ^{230}\rm th ) is exactly equal to the number of ^{230}\rm th decays per second.
1.what is the relative concentration of the two isotopes - the ratio of ^{234}\rm u to ^{230}\rm th - when this equilibrium is reached?
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Chemistry, 22.06.2019 08:30
Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol
Answers: 2
Chemistry, 22.06.2019 14:00
The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.
Answers: 3
Corals take up certain elements from seawater, including uranium but not thorium. after the corals d...
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