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Problem- A young researcher set out to develop a method for quantifying the polycyclic aromatic hydrocarbon (PAH) content in a contaminated soil sample by gas chromatography. During the initial stages of method development, the researcher was unable to separate anthracene and naphthalene with baseline resolution. From the options below, select all possible modifications the researcher could make to improve the resolution.
a) Decrease the temperature
b) Increase the stationary phase thickness
c) Use a column with a larger inner diameter
d) Choose a different stationary phase
e) Increase column length
Rework your solution from the beginning and check each step carefully
coal fired power plants freqently encounter coal that is 3.90% sulfur by mass. when this coal is burned at a power plant the sulfur is converted into sulfur dioxide gas,
Describe what is reduced and what is oxidized, balance the chemical equation by the half reaction method on both acidic and basic ways HCN +CrO4^2- = CNO^- + Cr(OH)4-
What is the difference in water solubilities of fumaric and maleic acid? Which one is more water soluble?
a solid block of exactly 100.0 cm cubed has a mass of 153.6g. Determine its density.Will the block sink or float on water.
1. Which of the following is NOT a form of potential energy. a. compression of a spring b. electrostatic force c. gravity d. a free electron moving at 1000 m/s e.
Perform a t-test at the 95% confidence level to determine if the new method contains bias. What is the calculated value of t for the new method
protonated benzoic acid in solution give the Henderson-Hassalbach equation and calculate pH
An ingot of copper with a mass of 48.00kg is drawn into a wire with a diameter of 0.8440cm. The density of the copper is 8.960 grams per cm3.
Calculate the number of collisions required to slow a neutron from an energy of 2.85 MeV to a thermal energy of 0.025 eV, using a moderator with an average logarithmic energy decrement of .955.
p-Dichloobenzene (PDCB) is replacing naphthalene as the active ingredient in mothballs. Calculate the value of K sub f for camphor if a 0.289 m solution of PDCB in camphor decreases the freezing point pf camphor by 11 degrees celsius.
Air at 50 % relative humidity is cooled isobarically at 1 atm from 90 degrees celcius to 25 degrees celcius. How many moles of water condense per cubic meter of feed gas
If one reacts a double bond with bromine in chloroform a dibromide is obtained. However, if one reacts bromine in water with a double bond, a vicinal halohydrin is formed. Provide an explanation for this result and show a mechanism for the reactio..
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