Chemistry, 23.07.2019 16:10 sandersasia2
a sample of potassium is composed of 23% k-39, 48% k-40 and the remainder k-41. calculate the average mass
of the sample.
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What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion
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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.
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Chemistry, 23.06.2019 13:30
How many ammonium ions and how many sulfate ions are present in a 0.270 mol sample of ?
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Chemistry, 23.06.2019 14:00
What mass of iron must be in a hot pack to provide -335kj of heat when the iron reacts with oxygen and is converted to iron (111) oxide according to the following thermochemical equation? 2fe(s) + 1.5o2(g)—> fe2o3(s) delta h= -824.2kj/mol
Answers: 1
a sample of potassium is composed of 23% k-39, 48% k-40 and the remainder k-41. calculate the averag...
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