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On adding 10 drops of 6M HCl solution to an unknown solution of metal ions, a CHem-127 student observed a white precipitate being formed. the white precipitate may contain
a. Ag+ / and Pb2+b. Ag+ / and Cd2+c. PB2+ / and Cd2+d. PB2+ / and Bi3+e. Cd2+ / and Cu 2+
identify the following as characteristic of a solution, colloid, or suspension: a)particles of this mixture remain inside a semipermiable membrane, but pass through filters. b)the particles of solute in this mixture are very large and visible.
sugar 82.00 grams molar mass 342.3 gmol was dissolved in water. the freezing point of the solution was determined to be
117 gram sample of a metal reacts with hyrdochloric acid to produce 36.3 ml of dry hydrogen gas measured at stp. what
Aminotransferases are enzymes that catalyze the interconversion of amino acids and ?-keto acids. In this way, they can provide the carbon needed for gluconeogenesis from amino acids supplied by dietary protein
Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.342% Fe by mass, and each hemoglobin molecule contains four iron atoms. Calculate the molar mass of hemoglobin
What is the overall charge state for the tetrapeptide DREAM at physiological pH. The pK values for N-terminal, C-terminal, side chain of asp, arg, glu
At 5 oC the equilibrium constant for the reaction: 2 HBr(g) H2(g) + Br2(g) is KP = 2.80e-16. If the initial pressure of HBr is 0.00991 atm, what are the equilibrium partial pressures of HBr, H2, and Br2? p(HBr) = . p(H2) = . p(Br2) =
Gives what happens at neutral pH for aluminum hydroxide. A) Al dissolves B) Al(H2O)63+ dissolves C) Al(OH)3 precipitates D) Al(H2O)2(OH)4- dissolves
a metal sample weighing 37.6 grams, which has been heated to a temp of 100 degree cin boling water was placed in 48.6g of waterin a calorimeter. The inital temp of the water was 25.2 degree c.
Barbituric acid (ka = 1.1x10^-4) is used in the manufacture of some sedatives. For a 0.6733 M solution of barbituric acid, calculate
We did TLC and column chromatography separating methylene blue and fluorescein. The solvent contained mostly ethanol but also had NaOH, and this NaOH formed SiO- with the silica (the stationary phase), which is in competition with the solvent for ..
Calculate the number of theoretical plates N in the column of length L in 20 cycles. The observed resolution is 1.81. B) Now, calculate the plate height in the column in m.
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