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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?
How many moles of oxygen are in a compressed cylinder that has a volume of 8.00 L at a pressure of 14.0 atm and at 25 oC
What mass of silver chloride would be formed from mixing 250 mL of 0.240 M MgCl2 solution with 200 mL of 0.380 M AgNO3 solution? AgCl FWT = 143.32 g/mol
Why does it take significantly stronger magnetic and electric field strengths to move the beam of alpha particles compared with the beam of electrons (beta particles)
A mixture of carbon and sulfur has a mass of 9.0 g. Complete combustion with excess O2gives 22.7 g of a mixture of CO2 and SO2
What is the concentration of an KOH(aq) solution which requieres 25.00mL to titrate 42.30mL of 0.0250M H2SO4(aq) 2KOH(aq) + H2SO4(aq) -> K2SO4(aq) + 2H2O(l)
How much heat is evolved in converting 1.00 mol of steam at 155.0C to ice at -45.0°C? The heat capacity of steam is 2.01 J/(g⋅°C) and of ice is 2.09 J/(g⋅°C)
NO and O2 are mixed in a container of fixed volume kept at 1000 K. Their initial concentrations are 0.0200 mol/L and 0.0300 mol/L, respectively
Explain what volume of a concentrated HCL solution, which is 36.0% HCL by mass and has a density of 1.179 g/mL, must be used to make 5.30L of an HCL solution with a pH of 1.7
Compare alkalide ion with the neutral alkali atom - For a given alkali metal, how does the ionic radius of the alkalide ion compare to that of the neutral alkali metal atom? Explain using physical arguments.
Calculate the molality of a solution that contains 56.5g of benzoic acid, C6H5COOH, in 350mL of ethanol, C2H5OH. The density of ethanol is 0.789g/mL.
As mentioned before, our asteroid is in the shape of a sphere and has a mass of 1000 kilograms. Determine the density (in grams per cubic centimeter) of this asteroid if its diameter is known to be 1.2 meters. Useful information: 1 kg = 1000 g, 1 m =..
Compute percent C16H34 that reacted to form CO(g) in the process. If experiment carried out at constant V, how much heat would have been released?
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