Chemistry, 01.10.2021 22:20 nelsoneligwe7
A sample of Strontium-90 has a Half-Life of 28.1 years. How long will it take for a sample to
decay to 12.5% of its original mass?
A sample of Ge-66 (Half-Life = 2.5 hours) sat for 10 hours and only 5 grams remain. What wcw
the mass of the original sample?
I
Element X is a Radioisotope. If a 100-kg sample of Element X decays to 12.5 kg in 1 day, what
is the Half-Life of Element X in hours?
+
Strontium-90 (Half Life = 28.1 years) is used as a Radioactive Tracer in Medical and Agricultural
Studies. How many atoms out of a 1.68 x 1023 atom sample will remain undecayed after 56.2
years?
What percentage of a 900-gram sample of Potassium-37 (Half-Life = 1.23 seconds) exists after
6.15 seconds?
Answers: 2
Chemistry, 21.06.2019 20:30
If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared
Answers: 1
Chemistry, 22.06.2019 15:00
Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.
Answers: 2
Chemistry, 22.06.2019 22:00
4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.
Answers: 2
Chemistry, 22.06.2019 23:50
Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules
Answers: 1
A sample of Strontium-90 has a Half-Life of 28.1 years. How long will it take for a sample to
deca...
Social Studies, 19.09.2019 17:50
Social Studies, 19.09.2019 17:50
Chemistry, 19.09.2019 17:50
Mathematics, 19.09.2019 17:50
Mathematics, 19.09.2019 17:50
Mathematics, 19.09.2019 17:50
Social Studies, 19.09.2019 17:50
Mathematics, 19.09.2019 17:50
Biology, 19.09.2019 17:50
Mathematics, 19.09.2019 17:50