Chemistry, 25.09.2019 16:40 YaboiLawLess709
Acertain radioactive isotope has a half-life of 15 hours. how many hours are four half-lives?
Answers: 2
Chemistry, 22.06.2019 02:30
Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.
Answers: 1
Chemistry, 22.06.2019 05:40
Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml
Answers: 2
Chemistry, 22.06.2019 19:00
Which statement best describes what happens when molecular compounds melt
Answers: 1
Chemistry, 23.06.2019 02:00
Scientists are often interested in knowing the molar heat of combustion β the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?
Answers: 2
Acertain radioactive isotope has a half-life of 15 hours. how many hours are four half-lives?...
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