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Alpha helices are a type of secondary structure in proteins. What is the length of a 23-kDa single-stranded ?-helical protein segment? Assume a mean residue mass of 110 Da.
When a 2.50 L flask containing 1.00 atm of gas A is joined with a 0.500 L flask containing 0.750 atm of gas B, and the stopcock between the flasks is opened, and the gases are allowed to mix thoroughly
A gas is expanded in a cylinder from 2.00 L to 12.0 L against an external pressure of 1.80 atm. At the same time, it absorbs 2.56 x 103 J of heat from the surroundings. Calculate ?E of the gas in J. (1 L•atm = 101.3 J)
the ternary compounds called chlorofluorocarbons, or Freons, have proved to be very valuable as refrigerants and as cleaning agents for circuit boards. Unfortunately, in the atmosphere these compounds produce chlorine atoms that catalyze the decom..
Free radicals are important in many environmentally significant reactions. For example, photochemical smog, which forms as a result of the actions of sunlight on air pollutants, is formed in part by the following two steps.
An aluminum atom has a diameter of 143 pm. How many aluminum atoms can be placed on a line 1.00 mm long
Calculate the average translational kinetic energy (sometimes just called average kinetic energy)
When the substance is dissolved in a 1.20x10-3 M solution of HA, the catalyzed rate constant was found to be 3.20x10-5. Calculate the dissociation constant, Ka, of HA.
Molarity of sodium carbonate, How many grams of primary standard grade sodium carbonate are necessary to prepare 2.00 L
Pressure and temperature remain constant. What is the new voume if 0.500 mole O2 gas is added?
A student has analyzed several 1 nL volume samples of a 10-12 M solution. What is the expected precision due to Poisson statistics
After all the water is evaporated from 10.0 mL of a CsCl solution, 3.75 g of CsCl remains. Express the original concentration of CsCl solution in each of the following units.
what mass in grams of adipic acid C4H8(COOH)2 will neutralize 28.2 ml of .188 M NaOH at the phenolphthalien endpoint? (adipic acid is diprotic)
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