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What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m. Assume the van't Hof
Which of the following processes is most likely to take place as a result of the influence of temperature on enzyme activity, and not because of enzyme denaturation?
Barium metal crystallizes in a body-centered cubic lattic. The unit cell edge length is 502 pm, and the density of the metal is 3.50 g/cm3. Using this information, calculate avogadro's number
A student is coming out of the station by running in the wrong direction on this escalator. The local record time for this trick is 11 s. Relative to the escalator, what speed must the student excee
A particular form of electromagnetic radiation has a frequency of 9.87x10^15Hz. What is it's wavelength in nanometers?
How many grams of potassium dichromate should be added to a 50.0 mL volumetric flask to prepare 0.025 M Potassium dichromate when flask is filled to the mark with water?
A 77.0 -kg person stands on a scale in an elevator. What is the apparent weight in each of the following situations?
Calculate the percent ionization of benzoic acid at .250M
Three equal point charges, each with charge 1.90 mu C, are placed at the vertices of an equilateral triangle whose sides are of length 0.450 m. What is the electric potential energy U of the system?
How much natural gas will he need to burn? Natural gas produces 49.3 of heat per gram. (For the sake of simplicity, assume that the transfer of heat is 100 percent efficient.).
Calculate the nuclear binding energy of one lithium-7.
Serotonin is biosynthesized from the amino acid L-tryptophan. Following oxidation at the 5 position of the indole ring by tryptophan hydroxylase, serotonin is generated with the assistance of the p
Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to significant digits.
The turntable is rotating in the opposite direction with an angular velocity of magnitude 0.210 rad/s relative to the earth. The radius of the turntable is 3.10 m, and its moment of inertia about th
A 86 gram solution of silver nitrate contains 14 grams of AgNO3. What is the percent by mass of silver nitrate in this solution?
A skydiver whose parachute is fully deployed is descending at constant speed. Describe what is happening to her kinetic energy, her potential energy, and her total mechanical energy as she falls. Is
What is the specific heat of aluminum if the temperature of a 28.4 g sample of aluminum is increased by 8.1 oC when 207 J of heat is added?
Calculate the amount of heat evolved in the oxidation of 32.0 g of Fe (Ar = 55.85 g/mol) at 25 oC and 1 atm pressure ( ΔHfo(Fe2O 3,s) = -824kJ/mol)
500cm3 of 0.250M of na2so4 is added to an aqueous solution of 15.0g of BaCl2 resulting in a white precipitate of insoluble BaSO4. how many number of moles and how many gram of BaSO4 are formed?
A space station, in the form of a wheel 115 m in diameter, rotates to provide an "artificial gravity" of 3.20 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of ro
Calculate the equilibrium constant, Kc, she obtained for this reaction. A student ran the following reaction in the laboratory at 689 K
An airline passenger dangles her watch from a string while the jet takes off. The string makes an angle of 25o with respect to the vertical while the aircraft accelerates for takeoff, which takes ab
Rhodopsin is a biological pigment that serves as the primary photoreceptor in vision. The chromophore in rhodopsin is retinal, and the absorption spectrum of this species is centered at roughly 500.
Which half-reaction represents reduction?
At a physiological temperature of 37 C, what is the probability of rhodopsin populating the first excited state? How susceptible do you think rhodopsin is to thermal population of the excited state?