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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.
In the event of a severe and prolonged shortage of petroleum, suggest one alternative fuel that could be used for automobiles. What do you see as the advantages and disadvantages of your choice of alternative fuel?
The specific rotation of Compound X is +15.2o. A mixture of Compound X and its enantiomer are placed in the polarimeter and the observed rotation is -5.1o. Which enantiomer is in excess? (+ or -) Calculate the enantiomeric excess.
What is the most likely reason OSHA requires ammonium nitrate to be segregated for sulfur or finely divided metals? Explain your answer.
Beginning with 150.0 mL of 0.175 M ammonia, determine the solution's pH after an additional 25.0 mL of 0.400 M ammonium chloride is added to the solution be sure to account for the change in volume at each step.
the ionization of water must be considered in order to calculate the pH of this acidic solution.)
Calculate the pH during the titration of 100.0 mL of 0.200 M HCl with 0.400 M NaOH. First what is the initial pH (before any NaOH is added)? - What is the pH after 38.4 mL of NaOH are added?
Human saliva has a pH of approximately 6.8, and can be considered a: a)strong acid b)weak acid c)strong base d)weak base
A cylindrical container has a radius of 2.1cm and a height of 0.62m. What is the volume of the container in dm3
Why Do I Require More CaCO3 to Raise pH than Predicted? If you can remember back to a discussion and inquiry we exchanged last week concerning the use of sodium carbonate vs. calcium carbonate
Calculate the volumes of distilled water and 28ppt seawater which must be mixed to yield 1 liter of 18ppt seawater.
During an experiment: preparation of benzoic acid from benzonitrile what is the percent yield of benzoic acid: volume of benzonitirle: 2.0 mL and mass of benzoic acid obtained: 1.10 g
Illustrate (draw) the thermodynamic cycles for the acid dissociation of both HCl and HF. Classify each cycle as exergonic or endergonic. Do your calculated values agree with the observed strengths of each acid in water?
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