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Phenol is a common organic compound that may be used as a disinfectant. Its pKa in water is 10.0 while in methanol its pKa = 14.4. Is it a stronger acid in water or methanol? Explain the difference in the pKa for phenol in the different solvents.
A particular reactant decomposes with a half-life of 127 s when its initial concentration is .364M. The same reactant decomposes with a half-life 245 s when its initial concentration is .189 M.
For a certain reaction delta H = -76.0 kJ and delta S= -234 J/K, if n=3 calculate E(standard) for the reaction at 25 degrees celsius
At constant pressure, in which of the reactions is work done by the system on the surroundings? By the surroundings on the system? In which of them is no work done?
A sample of gas in a balloon has an initial temperature of 22 and a volume of 1610 . If the temperature changes to 58, and there is no change of pressure or amount of gas, what is the new volume, , of the gas?
Which group contains elements most likely to form covalently-bonded molecules?
The wavelength of maximum absorbance is solvent dependent. in water, the wavelength of maximum absorbance is 453 nm.
What is the concentration (mol/L) of the chromate ion in a saturated solution of silver chromate
A 2.20 g sample of a large boimolecule was dissolved in 13.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule.
magnesium chloride are used to make a solution with a final volume of 1.74L, then waht is the final Mg2+ ion concentration in ppm?
Why is sulfuric acid, rather than hydrochloric acid, used to catalyze the dehydration of alcohols?2. A sample of 150 mg of an organic compound is dissolved in 7.5 ml of water. The solution is paced in a 20-cm polarimeter tube and the rotation meas..
what is the concentration of oxygen in air-saturated water at 25 degrees C and .85 atm? Assume that the mole fraction XO2 is .209 and Henry's law constant for oxygen
Describe the nature and characteristics of PCB's. Why are they of importance to an EH&S or FS professional who encounters them when coming upon an incident scene where they are present?
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