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An acid with a pKa of 8.0 is present in a solution with a pH of 6.0. What is the ratio of the protonated to the deprotonated form of the acid?
To make a solution with a pH of 4.50 a student used the following procedure:A certain amount of sodium acetate along with 0.300 moles of acetic acid is added to enough water to make a solution of1.0
Calculate the mass of HONH2 required to dissolve in enough water to make 250 ml of solution having a pH of 10.00 (Kb= 1.1 x 10^-8)
You are designing a small coil (called a search coil) to measure magnetic fields. It is to have a diameter of 3.60 cm and is to be designed so that flipping it 180 degrees in a field of 9.00×1
An inductor has inductance of 0.260 H and carries a current that is decreasing at a uniform rate of19.0 mA/ s. Find the self-induced emf in this inductor.
How long after the switch is closed will it take for the energy stored in the inductor to reach half of its maximum value?
A quantity of ore consist of 90% (by weight) chalcopyrite mineral with a composition of CuFeS2. The rest is inert quartz,SiO2. The ore is roasted by heating it in oxygen at800oC.
What emf is induced in this loop? If the loop has a resistance of 0.650 ohm, find the current induced in the loop.
Calculate the pressure of 11.4 g of sulfur dioxide in a 24.0 mL vessel at 25.0 degrees Celsius using a) the ideal gas law and b) the van der Waals equation using Waals' constants ( a = 6.714; b = 0
A 0.35 kg particle moves in an xy plane according to x(t) = - 12 + 4 t - 6 t3 and y(t) = 20 + 9 t - 11 t2, with x and y in meters and t in seconds. At t = 0.9 s, what are (a) the magnitude and (b) t
Water has a density that is 13.6 times less than that of mercury. If an undersea vessel descends to 1.5 km, how much pressure does water exert in atm?
A car of mass M brakes for 40m along a level road before stopping. The coefficient friction between the tires and the road is 0.7. What was the car's initial speed when it started to brake? i) Draw
After all of theSO2 has been removed, the sample occupies a volume of23.5L at a temperature of 29 degrees Celsius and a pressure of 715torr. Determine the partial pressure of both CO2and SO2&nb
How can these diferent forces result from single electric field that exists at point P?
When an electric cell is connected to a circuit, electrons flow away from the negative terminal in the circuit. But within the cell, electrons flow to the negative terminal. Explain.
A gas bubble forms inside a vat containing a hot liquid. If the bubble is originally at 68 degrees Celsius and a pressure of 1.6 atm with a volume of 5.8 mL.
A 400 uH inductor is connected across an AC generator that produces a peak voltage of 5.2 V. a). At what frequency f is the peak current 46 mA?
A capacitor is connected to a 12 kHz oscillator. The peak current is 70 mA that produces an rms voltage of 5.0 V. a). What is the value of the capacitance C?
A light bulb is wired in series with a 139 resistor, and they are connected across a 120 V source. The power delivered to the light bulb is 23.7 W. What are the two possible resistances of the light
Consider a container of volume 5.0dm3 that is divided into two compartments of equal size. In the left compartment there is nitrogen at 1.0 atm and 25oC; in the right compartment there is hydroge
The filament in an incandescent light bulb is made from tungsten. The light bulb is plugged into a 240 V outlet and draws a current of 1.04 A. If the radius of the tungsten wire is 0.003 mm, how lon
The rate constant ,k, for a given reaction was determined at a number of temperatures. a graph of log k versus the reciprocal of the kelvin temperature yielded a straight line with a slope of -250k.
The earth's magnetic field, with a magnetic dipole moment of 8.5×1022 A*m^2, is generated by currents within the molten iron of the earth's outer core. (The inner core is solid iron.)
However, the superconductivity is destroyed if the magnetic field at the surface of the metal reaches or exceeds 0.10 {\rm T}.What is the maximum current in a straight, 2.4-mm-diameter superconducti
A powertel station delivers 54000kw of power at 1200v to a factory through wires with a total resistance 3.5. How much less power is wasted? How much power is delivered at 50000v rather than 12000v.