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A quantity of 6.0 moles of an ideal gas is reversibly heated at constant volume from 17 C to 35 C. Calculate the entropy change.
A piece of iodine is added to a dilute potassium hydroxide solution in a disproportination reaction. Write the unbalanced net ionic equation
a solution of acidic potassium permanganate is added to a solution of iron (II) sulfate Write an unbalanced net ionic equation
If an enzyme-catalyzed reaction proceeds at 25% maximal velocity at 5 mM substrate concentration, calculate the Km of the enzyme.
If the Km of the above enzyme is 12 mM, calculate the substrate concentration needed to achieve 40% of maximal velocity. Then what fraction of active sites are filled at 40% maximal velocity
Indole is a competitive inhibitor of chymotrypsin. In the absence of the inhibitor, chymotrypsin will very slowly hydrolyze glycine residues in proteins, but will hydrolyze aromatic amino acids. In
if two atoms of element A react with three atoms of element B, what is the chemical formula for the resulting compound
If the flask has a volume of 0.500 L, what is the minimum mass of PH3BCl3(s) that must be added to the flask in order to achieve equilibrium
Compound B is quite soluble in toluene, but only slightly soluble in petroleum either. How could these two solvents be used in combination in order to recrystallize compound b
Describe how you would purify p-nitrobenzoic acid from a mixture of a 9.0 g of p-nitrobenzoic acid and 2.0 g of o-nitrobenzoic acid using recrystallization.
Suppose that an astronomer discovers a quasar with a redshift of 7.1. With what speed would this quasar seem to be receding from us? Give your answer in km/s and as a fraction of the speed of light.
the element neptunium possesses 93 electrons and weighs 237 amu. Calculate the contribution (in %) of its electrons to its total mass.
Determine the number and symmetry of the vibrational modes in the molecule (trans-1,2-dichloroethylene). how many resonances would you expect to see in the IR spectrum
Describe how you would purify p-nitrobenzoic acid from a mixture of a 9.0 g of p-nitrobenzoic acid and 2.0 g of o-nitrobenzoic acid using recrystallization. Tell which solvents you would use and how
Determine whether kinetic energy is being converted to potential energy, or vice versa, in the following process. a) Water cascades downward in a waterfall. b) Electrolysis of water produces H_2 and
In an alternative analysis of spinach, a student adds the following to an extraction funnel: 50 mL ether, 50 mL water, 15 mL 0.1 M HCl, 0.25 g retinol (vitamin A), and 0.25 g glutamic acid, and proc
Select all of the correct statements about reaction quotients and equilibrium constants from the choices below. A reaction quotient equals the equilibrium constant at equilibrium.
The solubility of compound A in ethanol is .8g/100 mL at 0 degrees and 5.0g/100mL at 78. What is the minimum amount of ethanol needed to recrystallize a 12.0g sample of compound A
If your front lawn is 24.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1250 new snow flakes every minute, how much snow (in kilograms) accumulates on your lawn per hour
If you measure the refractive indices of two liquids and they are within 0.0001 units from eachother, how likely is it that the two liquids are identical
After a dose, the concentration of medication in the blood declines due to metabolic processes. The half-life of a medication is the time required after an initial dosage for the concentration to be
The men's world record for swimming 1500.0 m in a long course pool (as of 2007) is 14 min 34.56 s. At this rate, how many seconds would it take to swim 0.850 miles? (1 mi = 1609 m.)
A doctor prescribes 3 g of a drug, daily, for a patient. The pharmacist has only 750-mg tablets available. How many tablets will the patient take daily