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A zero-order reaction has a constant rate of 2.50×10-4 . If after 35.0 seconds the concentration has dropped to 1.00×10-2 , what was the initial concentration?
A 2.00 x 10^-3 mole sample of actylsalicylic acid was dissolved in 15.00 ml of water and titrated with .100 M NaOH. The equivalence point was reached after 20.0ml of NaOH solution had been added.
The zincblende structure of ZnS has the relatively large sulfide ion arranged at the lattice points of a face-centered cubic structure. The edge length of cubic unit cell is 540.9 pm. Determine the density of zincblende.
What is the triple point of material X. Consider melting 3.00 moles of material X at 1.00 atm. Assuming that the melting co-existence curve is a straight line, what is X's normal melting temperature
What would a TLC plate look like after developed with solutions crude biphenyl which contains methyl orange and recrystallized biphenyl with eluent Hexane:ethyl acetate (4:1)
Why don't we observe the deBroglie wavelength of everyday macroscopic objects (such as a moving car or a thrown baseball)? The wavelength is too small relative to the size of macroscopic objects to be observed.
What is the ratio of oxygen atoms to hydrogen atoms in the mineral cacoxenite, Fe4(PO4)3(OH)3 • 12H2O?
Calculate the percent dissociation of the acid to 3 significant figures. % ============= 2. The pH of a 4.28×10-3 M solution of a weak base that will accept only one proton is 7.17. Calculate the percent dissociation of the base to 3 significant f..
Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high
Draw the kekule structure of each of the following compounds. if cis/trans isomers exist, draw both and indicate the geometry of each.
When light of frequency 2.32×1015 s-1 shines on the surface of a metal, electrons are ejected with a maximum kinetic energy of 3.40×10-19 J. Calculate the wavelength of this light.
What volume of 1 M HCl do you have to add to change the pH of the solution to 6? Assume that the change in volume from adding HCl is negligible. Recall that pH = pKa + log([A-]/[HA]. I cannot, for the life of me, figure this out.
Determine the mass of this substance should evaporate in order to freeze 190 grams of water at 25 degree Celsius initially? It is given that the heat of fusion H 2 O= 334 specific heat of H 2 O= 4.18
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