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A parallel-plate air capacitor has a capacitance of 400pF and a charge of magnitude 0.250microC on each plate. The plates are 0.500mm apart. What is the surface charge density on each plate
If a 0.0157 M solution of a certain analyte exhibits 47.5% T at a wavelength of 280 nm, what will the percent transmittance be for a 0.0279 M solution of the same analyte? Assume the pathlengths for
When a battery is connected to a 100.0-? resistor, the current is 4.00 A. When the same battery is connected to a 400.0-? Find the emf supplied by the battery
Aldo Reaction Major and Minor Products from Benzaldehyde and Cyclohexanone. Why is the one you chose the major product
A small box of mass m1 is sitting on a board of mass m2 and length L . The board rests on a frictionless horizontal surface
You have a 1.23-mol sample of water at ?30.°C, and you heat it until you have gaseous water at 140.°C. Calculate q for the entire process. Use the following data.
A lactic acid/lactate ion buffer solution contains 0.43M HC3H5O3 and 0.62M C3H5O3^-, respectively. The value of lactic acid is 1.4*10^-4. Calculate the pH of this buffer.
Two cars drive on a straight highway. At time , car 1 passes mile marker 0 traveling due east with a speed of 17.0 . At the same time, At what time do the cars pass next to one another
The standard heats of formation at 25 degrees celsius for NO(g) , O3(g) and NO2 (g) are 21.57, 34.1, and 7.93 kcal/mol respectively. What is the value for change direction for
A specific steroid has max = 291 nm and molar absorptivity = 11,500. What is the concentration of the compound in a solution whose absorbance at 291 nm is A = 0.050 with a sample pathlength of 1.00
A painter (mass = 55.7 kg) climbs 3.28 m up a 7.16 m long ladder leaning against a frictionless wall. The ladder has a mass of 16.2 kg, find Friction force between the ladder and the ground
Suppose you throw a 0.048-kg ball with a speed of 10.7 m/s and at an angle of 32.1° above the horizontal from a building 11.5 m high. What will be its kinetic energy when it hits the ground
You are a secret agent and find that you have been pushed out of an airplane without a parachute. what is your new terminal velocity with the coat
When a large bone such as the femur is broken, the two pieces are often pulled out of alignment by the complicated combination of tension, how much mass m must be attached to the bottom pulley
An ammonia/ammonium buffer solution contains 0.22M NH3 and 0.83M NH4^+. The Kb value of ammonia is 1.8*10^-5. Calculate the of this buffer.
measured in a 1.00-cm pathlength cuvette, has an absorbance of 0.321 while the reagent blank in the same cuvette has an absorbance of 0.014. What would be the absorbance reading of these two solutio
1-Napthaleneacetic acid is not soluble in water at room temperature but goes into solution readily when heated.
What is the chemical formula for the base iron(III) hydroxide. The formula for the oxalate ion is C2O4^2-
Predict the order of elution for benzoic acid and methyl orange in normal phase column chromatography using polar SiO2 as the stationary phase. In other words, which compound should come off the col
A 12 oz can of Coke contains 46 mg of caffeine. One fluid ounce is equivalent to 29.57 mL (1 oz = 29.57 mL). What is the concentration of caffeine in Coke, in units of mg/mL
You have discovered a new element with an atomic weight of 260 g/mol and a density of 30 g/cm3. If the atoms pack on a BCC lattice what is the hard sphere atomic radius R (in nm)
An eagle is flying due east at 8.9 m/s carrying a gopher in its talons. What is the magnitude of the gopher's velocity as it reaches the ground
The density of aluminum is determined to be 2.680 g/cm3 at 125 degrees celcius. What is the length of one side of a 1 kg cube of aluminum at 640 degrees celcius.
A physics teacher tells her class that their final project requires the students to measure a specific variable and determine the velocity of a car with no more than 2.5% error. Will Jennifer and Jo
A thundercloud similar to the one described in Example 24.3 produces a lightning bolt that strikes a radio tower. find the effective resistance of the air during the lightning strike