Chemistry, 21.04.2021 22:30 ashley2816
Elephants are endangered because of humans. How have they adapted to increase their chance of survival
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 07:30
The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.
Answers: 3
Chemistry, 22.06.2019 13:30
What produces wave a)sound b) heats c)transfer of energy d)vibrations
Answers: 2
Chemistry, 22.06.2019 14:00
How is the atomic number of a nucleus changed by alpha decay
Answers: 2
Elephants are endangered because of humans. How have they adapted to increase their chance of surviv...
Chemistry, 14.05.2021 20:10
Chemistry, 14.05.2021 20:10
Biology, 14.05.2021 20:10
Mathematics, 14.05.2021 20:10
Mathematics, 14.05.2021 20:10
Mathematics, 14.05.2021 20:10
Mathematics, 14.05.2021 20:10
Biology, 14.05.2021 20:10
English, 14.05.2021 20:10