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Three resistors are connected in series across a battery, What is the greatest voltage that the battery can have without one of the resistors burning up
The half-life of 32P is 14.3 days. If you begin with 4.9 ?g (micrograms) of radioactive 32P in the form of Na2HPO4, what mass remains after 28.6 days (about one month)
A spherical object with a radius of 40.0 cm has a net charge of 37.7uC distributed uniformly throughout its volume, Using Gauss's Law, calculate the electric field 71.5 cm from the center of the spher
A current of 0.0100 A is passed through a solution of rhodium sulfate, causing reduction of the metal ion to the metal. After 3.00 h, 0.038 g of Rh has been deposited. What is the charge on the rhod
A voltaic cell with Mn/Mn2+ and Cd/Cd2+ half-cells has the following initial concentrations: [Mn2+] = 0.090M and [Cd2+] = 0.060M. What is the equilibrium concentration of Cd2+
There are approximately 120 million TVs in the United States. Each uses, on average, 75 W of power, how much money is spent every day in keeping the TVs turned on
With a solution in them connected by a liquid salt bridge junction filled with KNO3. In one solution you have a graphite electrode that is connected with a wire to a copper electrode in the second s
Find the distance from the origin on the x-axis between the charges where the electric potential due to the two point charges vanishes
The molal freezing point constant for water is 1.86 C/m. At what temperature will a mixture of 2.00 g of CaCl2(MM: 110.98g/mol) and 25.00 g of water freeze
A silicon sample is doped with phosphorus at 1.23 parts per million. Phosphorus acts as an electron donor, Calculate the number of free electrons per unit volume of the doped silicon.
When 50.0mL of a 1.00M solution of Fe(NO3)3 is mixed with 50.0mL of a 1.00M solution of NaOH a precipitate forms. Determine the mass of the solid produced in this reaction
A defibrillator is used during a heart attack to restore the heart to its normal beating pattern, How many electrons pass through the wires connected to the patient
A sulfuric acid solution is 54.0% H2SO4 by mass and has a density of 1.59 g/mL at 20 C. What is the molarity and molality of the H2SO4 solutions
A tungsten wire has a radius of 0.070 mm and is heated from 20.0 to 1416 oC. The temperature coefficient of resistivity is ? = 4.5 x 10-3 (Co)-1, How long is the wire
calculate the pressure change needed to completely hydrogenate this substance at room temperature and 50 degrees celcius.
A small particle has charge -2.30\mu C and mass 3.00×10^-4kg . It moves from point A, where the electric potential is V_A = 120V , to point B, What is its speed at point B
What is the mass of H2SO4 in 520.0 cm3 sample of sulfuric acid that has a density of 1.55 g/cm3 and which consists of 55.0 % H2SO4
A girl is sledding down a slope that is inclined at 30º with respect to the horizontal, The combined mass of the girl and the sled is 76.5 kg, How much time is required for the sled to travel dow
Determine the bond order of each and classify it as stable or non-stable. If stable, tell whether the species is paramagnetic or diamagnetic.
Two objects (39.0 and 23.0 kg) are connected by a massless string that passes over a massless, frictionless pulley, find the acceleration of the objects
For each of the following species, draw its Lewis-dot structure. If the species exhibits resonance, draw all the resonance hybrids. For each species, tell its shape, bond angles, hybridization of th
A car is towing a boat on a trailer. The driver starts from rest and accelerates to a velocity of +16.6 m/s in a time of 34.3 s, What is the tension in the hitch that connects the trailer to the car
A rescue helicopter is lifting a man (weight = 719 N) from a capsized boat by means of a cable and harness, What is the tension during the remainder of the rescue when he is pulled upward at a constan
How many mmoles of ammonia would have to be added to 300. mL of 0.10 M cupric sulfate in order to reduce the Cu2+ concentration to 1.0 x 10-8 ? Kf for [Cu(NH3)4]2+ = 5.0 x 1012 Assume no change in vol