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A student performed thin layer chromatography as explained in this experiment but made the following mistakes or changes in the procedure. In each case, define how the change/mistake would affect the Rf value:
A. student failed to close the container containing the developing solvent and in which the thin layer chromatography run was carried out
B. the solvent level in the developing jar was above the origin line on the thin layer chromatography sheet
C. student utilized as developing solvent, a mixture of two immiscible solvents
D. student spotted too much of a concentrated sample of the compound to be chromatographed
E. the student dozed off as well as the solvent front ran off the thin layer chromatography plate before he stopped the run
A first order reaction has an activation energy of 72.4 kJ/mol and a frequency factor (Arrhenius constant) of 1.78 x 1013 sec -1. Calculate the rate constant at 17 oC.
A dilute electrolyte solution is prepared by dissolving iron(III) chloride in water. It is found to have a freezing point
Determine the second order rate constant from the initial concentration and half life and what is the second order rate constant?
Here are four of my question, my professors wants us to represent this newman projection and sawhorse projection. (1) a gauche conformation of hexane viewing down the C2-C3 bond
The Brass is a substitutional alloy consisting of a solution of copper and zinc. A meticulous sample of red brass consisting of 82.0% Cu and 18.0% Zn by mass has a density of 8780kg/m3. Explain what is the molality of Zn in the solid solution
Calculate the enthalpy change for this reaction per mole of "X". Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 J/g*C and 1.00g/mL ] and that no heat is lost to the calorimeter itself, nor to ..
What mass of silver chloride will be recovered if excess sodium chloride is added to 500 mL of solution containing 10.79g of Ag+?
Ethylene is supplied by a 60.9-L gas cylinder initially at 2200.0 psig and 25.0°C. Once leaving the cylinder, a regulator reduces the pressure to 15.0 psig, and a valve allows 1.000 mL/s of ethylene at 25.0°C to flow into the reactor
Calculate the theoretical yield of C2H5Cl. Calculate the percent yield of C2H5Cl if the reaction produced 176 g of C2H5Cl.
what minimum number of packages of buns, packages of patties, and jars of pickles do you need, respectively? Express your answer as three integers separated by commas.
containing helium gas at a pressure of 31.1 atm is used to fill a weather balloon in order to lift equipment into the stratosphere. To what maximum pressure (in atm) could a 151 L balloon be filled.
A sample of protein weighs 0.800 g and is dissolved in 50.0 mL of water. If the osmotic pressure of the solution is 10.5mmHg at 25 degrees C, what is the molecular weight of the protein
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