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a.) Sketch a graph of the van Deemter equation (plate height vs. linear flow rate). What would the curve look like if the mutliple path term were 0? If the longitudinal diffusion term were 0? If the finite equilibration time term were 0?
b.) Explain why the van Deemter curve for 1.8μm particles is nearly flat at high flow rate.
c.) Explain why the 2.7 μm superficially porous particle enables separations similar to those achieved by 1.8 μm totally porous particles, but the superficially porous particle requires lower pressure.
Lactic acid, HC3H5O3, is a monoproctic acid that forms when milk sours. An 18.50 ml sample of a solution of lactic acid required 17.52 ml of 0.1550 M NaOH to reach an end point in titration.
What is the molar mass of the unknown solution containing 1.01 g of unknown in 17.74 g biphenyle froze at 42 degrees C. Pure biphenyl freezes at 71.0C
Based upon the intermolecular forces present, rank the following substances according to the expected boiling point for the substance.
What is ozone and how it works as a protective molecule for our environment? What are the effects of CFCs on the ozone layer.
A particular dye solution has an absorbance of 0.984 in a 2.0-cm pathlength cuvette. When the same solution is placed in another cuvette, it has an absorbance of 0.652. What is the pathlength of the second cuvette
In a lab experiment demonstrating Beer's law, the absorbance of a 0.15 M sample of solution A was 0.750 at the wavelength of maximum absorbance. What is the molar absorptivity (extinction coefficient) if the path length is 1 cm
Calculate rate constant for 1. level reaction where 81% of the matters have already react after 27 seconds.
a gas sample in a piston assembly expands doing 588 kj of work on its surroundings at the same time that 372 kj heat is
calculate the work in kj when 3.00 moles of hydrogen gas are produced from the reaction of sodium in excess water at
Draw the product of the reaction of propanal with methanol containing dissolved hydrogen chloride. Draw the product of the reaction of propanal with sodium cyanide with addition of sulfuric acid
Compare and contrast the following: size exclusion chromatography and ion exchange chromatography. points to include would be methods of action used in both, examples of use for both, advantages and disadvantages and levels of sensitivity or detec..
Use a spreadsheet to calculate the composition of dry air at 5400K and 1 bar. Take the initial composition as .78 mol N2, .21 mol O2 and .01 mol Ar. Neglect the ionization of NO.
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