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How long will it take a protein of molecular weight equal to 90,000 g/mole to diffuse a distance of 1 μm?
Most of the Sun's energy comes from the proton-proton chain in which four hydrogen nuclei (i.e., protons) fuse into one helium nucleus. (a) Calculate how much mass is "lost" in one proton-proton cha
Assume that the density of blood is 1.05 g/cm3 and that the only reason the pressure changes is due to the weight of the blood.
Assume all the energy in the doughnut can be converted to mechanical energy. (Take 75 kg as the mass of a typical person.)
A solution containing 10 mmol of CO3-- and 5.0 mmol of HCO3- is titrated with 1.0 M HCl. What total volume of HCl must be added to reach the 2nd equivalence point?
What do the terms "activating", "deactivating", "ortho, para-directing" and "meta-directing mean. How do these relate to aniline, the anilinium ion (protonated aniline), and acetanilide?
A baseball leaves a pitcher's hand horizontally at a speed of 160 km/h. The distance to the batter is 18.3 m. Neglect air resistance. a) How long does the ball take to travel the first half of the d
Fluorine-18 undergoes positron emission with a half-life of 1.1x10^2 minutes. If a patient is given a 248mg dose for a PET scan, how long will it take for the amount of fluorine-18 to drop to 83mg?
Assume that the enthalpy fusion of ice is 6020 J/mol and does not vary appreciably over the temperature range of 270-290 degrees Kelvin.
A projectile is launched from ground level at 90 m/s at an angle of 48.0 degrees above the horizontal, and it is subject only to gravity (in free fall, air resistance ignored). aa) What is the time
MIlk of magnesia , Mg(OH)2, is prepared from aqueous solutions of magnesium sulfate and sodium hydroxide. If a solution containing 50.0-g of MgSO4 is added to a solution with 50.0-g of NaOH.
Potash is composed mainly of potassium carbonate. K2CO3. If 1.000-g of potash reacts with sulfuric acid to produce 145 mL of carbon dioxide gas at STP, what is the percentage of potassium carbonate
The Vapor pressure of a solution containing 36 g of calcium phosphate in 45 g benzene was calculated to 18000 Pascals at 40 °C. Calculate the vapor pressure of pure benzene at 40°C.
The reaction between silver nitrate and sodium chloride is found to have heat of reaction of -64 kJ ( Delta H of Rxn= -64 kJ). Write a balanced chemical equation and determine the source of the heat
What is the minimum horizontal force that the student must apply to the textbook to prevent it from falling?
A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water below. How far does the rock travel horizontally before striking the water?
The equilibrium constant Kp is 158. Analysis shows that the partial preassure of O2 is 0.25 atm at equilibrium. Calculate the pressure of NO and NO2 in the mixture.
A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stop watch measures the stone's trajectory time from the top of the cliff to the bottom to be 4.3 s. What i
Calculate the hydrogen ion concentration in mol/L for each of the following solutions.(a) 2.42, (b) a solution whose pH is 16.00, (c) a solution whose hydroxide concentration is 3.7x 10-9 M
An lady bug walks 20.0 cm in a direction of 30.00 North of East. She then turns and walks 30.0 cm North, turns and walks 10.0 cm West. How far is the lady bug from where she started.
A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal THREE TIMES her weig
Calculate the pH of a solution prepared by mixing 15.0mL of 10M NaOH and 30.0mL of 10.0M benzoic acid solution.(Benzoic acid is monoprotic; its dissociation constant is 6.5*10^-5)
A solution is made to be 3.8 * 10-2 M in Al3+ and .29 M in NaF. If the Kf for AlF63+ is 7 * 1019, how much aluminum ion remains at equilibrium?
A wire of cross-sectional area 5.00*10^-6 m^2 has a resistance of 1.75 Ohms. What is the resistance of a wire of the same material and length as the first wire, but with cross-sectional area of 8.75
A touches B, then the two spheres are separated. B touches C, then those spheres are separated. Finally, C touches A and those two spheres are separated. How much charge is on each sphere?