Chemistry, 02.10.2020 14:01 officialariana01
A radioisotope has a half-life of 12 days. If a sample is measured to contain 5 grams of radioisotope, how much time has passed if the sample originally measured 160 grams of radioisotope?
Answers: 3
Chemistry, 22.06.2019 09:30
1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle
Answers: 1
Chemistry, 22.06.2019 13:50
Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.
Answers: 1
Chemistry, 22.06.2019 17:10
)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.
Answers: 1
A radioisotope has a half-life of 12 days. If a sample is measured to contain 5 grams of radioisotop...
Mathematics, 08.04.2021 19:00
Biology, 08.04.2021 19:00
Mathematics, 08.04.2021 19:00
Mathematics, 08.04.2021 19:00
Biology, 08.04.2021 19:00
Advanced Placement (AP), 08.04.2021 19:00
Computers and Technology, 08.04.2021 19:00
Mathematics, 08.04.2021 19:00
Mathematics, 08.04.2021 19:00
Biology, 08.04.2021 19:00
Mathematics, 08.04.2021 19:00
Mathematics, 08.04.2021 19:00
History, 08.04.2021 19:00
History, 08.04.2021 19:00