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What should be the concentration of the potassium thiocyanate solution in order that each mL of solution correspond to exactly 1 mg of arsenic present?
What should be the concentration of the hydrchloric acid solution so that each mL of the acid corresponds to exactly 1mg of nitrgogen present?
How can a wave have kinetic energy around the nucleus? And how can we know that this barrier exists due to Heisenberg's uncertainty principle?
What volume of 3.0M sodium hydroxide must be added to the second portion in order to assure a 50% excess of sodium hydroxide? Why is this excess necessary?
For each of the lowest-energy ground State) terms in p3,and p1 d1 ( as in a 4p13d1 configuration) determine the possible value of J. Which J value describes the state with the lowest energy.
In order to determine the composition of the sample, the following analysis was carried out: A 0.9146g sample of the mixture was weighed and placed in a 110 degrees C oven for 2 hours.
A vessel of volume 0.2 m^3 contains nitrogen at 1.013 bar and 15 degrees C. If 0.2 kg of nitrogen is now pumped into the vesses calculate the new pressure when the vessel has returned to its initial
Calculate the % yield for the following reaction, based on the results regarding the synthesis of 2-iodooctane from 2-chlorooctane. Show all calculations.
You have synthesized a new compound: the crude product melts at 102-106 C. You spend a little time purifying it and do the melting point again. What range would you expect the m.p. to be for the pur
Calculate the standard emf of a cell that uses the Mg/Mg^2+ and Cc/Cu^2+ half cell reactions at 25°C. Write the equation for the cell reaction that occurs under standard-state conditions.
In a coffee-cup calorimeter, 1.40 g of NH4NO3 is mixed with 77.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents
A 15.0 cm cube of sodium metal (density = 0.968 g/ml) is thrown into an acidic lake equivalent to a buffer of 5.00 x10-4 M acetic acid and 8.00 x10-4 M sodium acetate.
A mixture weighing 27.73 mg containing only FeCl2 (FM 126.75) and KCl (FM = 74.55) required 18.49 mL of 0.02237 M AgNO3 for complete titration of the chloride. What is the weight percent Fe in the
Bones are recovered from an ancient camp site. They emit 452 cpm(counts/min). Current carbon containing materials measure at 1430 cpm. What is the age of the bones?
A certain molecule fluoresces at a wavelengh of 400 nm with a half life of 1.0ns. It phosporesces at 500 nm. If the ratio of the transition probabilities for stimulated emission for the S*-->S to
What would be the correlation between the color of your dye solution (crystal violet) and the wavelength of its maximum absorbance in the visible spectrum of the solution? Show your calculations fo
What advantages does THF have over using diethyl ether in a grignard synthesis reaction? Why must Grignard reagents be run in an ether solvent?
What does the term paramagnetism mean? How can one determine experimentally whether a substance is paramagnetic?
A solution of potassium permanganate was standardized by titration with a standard Fe2+ solution at pH 2.0. The iron solution was prepared from 0.7417 g of pure iron wire and required 30.16 mL of th
A solution is prepared by dissolving 10.8 g ammonium sulfate in water to make 100.0 mL of stock solution. A 10.0 mL sample of this stock solution is transferred into a flask and then water was added
Forgetful Freddy weighed his KHP sample, but forgot to bring his report sheet along, so he recorded the mass KHP on a paper towel. During his titration, which required 18.46 mL of base, he spilled s
A certain batch of fireflies were observed to "flash" at the rate of 15.4 times per minute at 25°C, and at the lower rate of 5.1 times a minute at a temperature of 15°C.
What is the equilibrium concentration of fluorine if the initial concentrations of bromine and fluorine were 0.127 moles/liter in a sealed container and no product was present initially?
Calcium carbonate combines with HCL to produce calcium chloride, water, and carbon dioxide gas. Write a balance equation for this reaction. How many moles of HCL are required to reat with 2.5 moles
The molecular mass of hemoglobin is 6.86*10^4 u. What mass of hemoglobin must be present per 100.0 ml of a solution to exert an osmotic pressure of 7.25 mmHg at 25 degrees Celsius?