Chemistry, 06.05.2020 02:05, SmoothCruzito16
A volcanic eruption melts a large area of rock, and all gases are expelled. After cooling, 40Ar (atomic number 18) accumulates from the ongoing decay of 40K (atomic number 19) in the rock (t1/2 = 1.25 Ă 109 yr). When a piece of rock is analyzed, it is found to contain 1.07 mmol of 40K and 1.45 mmol of 40Ar. How long ago did the rock cool? Enter your answer in scientific notation.
Answers: 2
Chemistry, 21.06.2019 17:30, ronny80
Supongamos que estĂĄs estudiando dos estrellas. ambas estrellas tienen la misma magnitud aparente, pero la estrella a tiene una magnitud absoluta mayor que la estrella b. Âżque puedes decir acerca de la distancia a la tierra de estas dos estrellas?
Answers: 3
Chemistry, 21.06.2019 20:10, cefindley14
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Answers: 2
Chemistry, 21.06.2019 20:30, moneykey
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Answers: 1
Chemistry, 22.06.2019 12:00, shifaxoxoxo
What term is applied to a scientist who studies ancient life, including animal and plant fossils a. anthropologist b. dendroclimatologist c. geophysicist d. paleontologist
Answers: 2
A volcanic eruption melts a large area of rock, and all gases are expelled. After cooling, 40Ar (ato...
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