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Suppose you had a detection device that could count every decay from a radioactive sample of plutonium-239 (t1/2 is 24000 yr). How many counts per second would you obtain from a sample containing 0
An ambulance moving at 42 m/s sounds its siren whose frequency is 450Hz. A car is moving in the same direction as the ambulance at 25 m/s. What frequency does a person in the car hear (a) as the amb
Given that the E(o) for Cu+ is 0.521V and the E(o) for Fe(2+) is -.440V, determine the cell potential for the reaction and state wether or not the reaction is spontaneous.
Find the displacement amplitudes of the a) initial note and b) the final note. part c and d should be in pascals.
You add 7ml of 6M NaoH to a flask and diluted with water to a final volume of 400ml with water. Neutralization required 21.45ml of the base solution when titrating 20.00ml of a 1.005 HCl solution.
A subway train starts from rest at a station and accelerates at a rate of 1.64 for 13.1 . It runs at constant speed for 70.7 and slows down at a rate of 3.50 until it stops at the next station. Fin
Explain the formation of line spectrum in the Balmer series of hydrogen atom. If the emitted photon has a wavelength of 434nm, determine the transition of electron that occurs.
Question- Two identical objects, each of rest mass m0, moving with equal but opposite velocities of 0.50c in the laboratory reference frame, collide and stick together. The resulting particle is at
Methyl Orange is an acid-base indicator. In dilute solution at pH greater than 4.4, it is yellow. At pH = 3.2 the solution appears red.
Assuming 100% efficiency, (a) to what height can the motor lift a 5.0-g mass? (b) What initial voltage must the capacitor have if it is to lift a 5.0-g mass through a height of 1.0 cm?
Diazonium salts couple with phenols in slightly alkaline solution. What effect does the pH of the solution have on the reactivity of the phenol?
Write a suitable mechanism for the cleavage of butyl isopropyl ether with HI at 100 degrees C to form exclusively isopropyl alcohol and 1-iodobutane. Explain why butyl alcohol and isopropyl iodide
A hot air balloon is rising upward with a constant speed of 15 m/s. When the balloon is 5 m above the ground, the balloonist accidentally drops a compass over the side. a.) How much time elapses bef
Enough cadmium(II) chloride is added to make Cd2+ 0.0013 M. What is the pH of the resulting solution? What percentage of the original hydroxide ion is left in solution?
Calculate the molar concentration of ethanol in an aqueous solution that contains 2.30g of C2H5OH in 3.50L solution.
(a) What potential difference is required to bring the proton to rest? (b) What potential difference is required to reduce the initial speed of the proton by a factor of 2? (c) What potential differ
A proton is initially at rest at a point where the potential is 471 V. Some time later the proton is at a point where the potential is 185 V. If no force other than the electrostatic force acts on t
To test the effectiveness of a gunpowder mixture, 1 gram was exploded under controlled STP conditions and the reaction chamber was found to expand to 310 cm3.
A lead ball is dropped into a lake from a diving board 18 ft. above the water. It hits the water with a certain velocity and then sinks to the bottom with this same constant velocity. If it reaches
An unknown gas effuses at a rate that is only 0.468 times that of O2 at the same temperature. What is the molar mass of the unknown gas?
The plates of a spherical capacitor have radii 31.0 mm and 32.0 mm. (a) Calculate the capacitance in picofarads. (b) What must be the plate area in square centimeters of a parallel-plate capacitor w
After flying for 15 min in a wind blowing 42 km/h at an angle of 34° south of east, an airplane pilot is over a town that is 44 km due north of the starting point. What is the speed of the airpl
A car is traveling over a hill. If, using a Cartesian coordinate system with origin O at the top of the hill, the hill;s profile is described by the function y=-(.003m^-1)x^2, where x and y are in m
Diethyl ether has a vapor pressure of 400.0 torr at 18°C. When a sample of benzoic acid is dissolved in ether, the vapor pressure of the solution is 342 torr. What is the mole fraction of benzo
Dimethylglyoxime, DMG, is an organic compound used to test for aqueous nickel(II) ions. A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C. What is the molar mas