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1a. What is the chemical structure of caffeine? What structural features make it soluble in water, and in ethyl acetate?
b. The solubility of caffeine is 2.2mg/ml at 250C, 180mg/ml at 80oC, and 670mg/ml at 100oC. Why does the solubility change with temperature?
c. Using the information given in question 3, comment on the "wake you up" capability of iced tea.
d. Why did we do three extractions with ethyl acetate versus only one?
You have a mixture of 3 proteins, listed in the table below with their relevant properties. You areinterested in isolating aspartate transaminase using ion exchange chromatography with DEAE resin. Giventhe values in the table below: 1) what pH would ..
Question- A catalyst increases the rate of a chemical reaction by providing a lower-energy mechanism for the reaction. When a catalyst is used in an equilibrium system, which one of the following is not affected? rate of the reverse reaction, the ..
A 100.0 mL sample of cold water at 21.3 C was added to a 75.0 mL sample of hot water at 55.1 C. Calculate the temperature of the warm water mixture.
if ammonia is obtained in 90% yield based on hydrogen, how many tons of hydrogen are necessary to produce 100 Mg of ammonia?
The concentrations of each were then determined as follows: [Fe^3+]= 6.8 x 10 ^-4 M, [SCN ^-]= 3.3 x 10 ^-4 M, [FeSCN ^2+]= 3.0 X 10 ^-5 M. Determine the equilibrium constant for this reaction.
A piece of lead is placed into a graduated cylinder. The level of the liquid rises from 235 to 305 mL. What is the mass in grams of the lead if the density of lead is 11.3g/cm3?
Compute the freezing point depression of liquid mercury caused by dissolved sodium if the mole fraction of sodium is 0.0477. For Hg(l), Tm = -39oCand DHfus= 2331 J mol-1
the national institute for occupational safety and health (NIOSH) sets standered for ccl4 in air at 12.6 mg/m^3 of air
what is the maximum number of electrons in an atom that can have the following set of quantum numbers? n 4 l 3 ml -2
The Ksp of beryllium hydroxide, Be(OH)2, is 6.92 x 10^-22. Calculate the molar solubility of this compound
what is the calculated value of partial pressure of o2 in acid mine water of ph 2 in which fe2+=fe3+.
The NO molecule has a double degenerate electronic ground state and a double degenerate excited state at 121.1 cm- 1. Calculate and plot the electronic contribution to the molar heat capacity of the molecule up to 500K
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