Chemistry, 26.07.2019 20:20 florenciaaxell4042
A) which are the things you should take care of before, while and after running your analyses? b) what do you need control reactions for? what do you use for a good control reaction? c) sample homogeneity is important for running most of the analyses. why? in which situation might it be advantageous to exploit a sample inhomogeneity? d) why is it useful to read any type of label that comes with an 'unknown' or suspicious substance? e) which information can you find in the pharmacopoeia?
Answers: 3
Chemistry, 22.06.2019 14:00
The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.
Answers: 3
Chemistry, 22.06.2019 14:30
For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2
Answers: 3
Chemistry, 22.06.2019 21:30
What is another way to determine mass times acceleration?
Answers: 1
Chemistry, 23.06.2019 01:00
Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released
Answers: 3
A) which are the things you should take care of before, while and after running your analyses? b) w...
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