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You created a buffer system by first neutralizing the supernatant solution containing Pb2+, Fe3+, Al3+, Ca2+, Cu2+, and K+ ions with 6M NH3 solution , and then adding an equal additional volume of 6
Calculate the work done by the electric field force on an electron when the electron moves from point O, where the potential is -30.0 V, to point F,
A projectile is fired at 60.0 o above the horizontal. Its initial speed is equal to 150.0 m/s. Like most problems in this class (2010), ignore the effects of air unless told otherwise
The leaves of a Rhubarb contain high concentrations of diprotic oxalic acid (HOOCCOOH) and must be removed before the stems are used to make rhubarb pie. If pKa1=1.23 and pKa2=4.19, what is the pH o
In this experiment the choice of precipating reagent is important. briefly explain what the consequences would be if excess 6M NaOH solution instead of 6M NH3 solution were used to seperate Fe3+ and
Two resistors connected in series have an equivalent resistance of 569.5 Ohms. When they are connected in parallel, Find the resistance of each resistor
A point charge Q is trapped at the center of a thin-walled hollow conductive sphere of radius R, How much charge will collect on the inside surface of the hollow sphere
A tennis ball is hit straight up at 25 m/s from the edge of a sheer cliff. Some time later, the ball passes the original height from which it was hit, What total distance did the ball travel
A 0.401 kg bead can slide on a curved wire, If the wire is frictionless and the bead is released with an initial speed of 12.8 m/s in the forward direction then find the speed of the bead at B
In a TV-show, an inexperienced doctor touches the electrodes of a defibrillator and gets thrown across the room, what is the maximum height above ground he could reach
The conversion of glucose into lactic acid drives the phosphorylation of 2 moles of ADP to ATP and has a deltaG= -135 kJ/mol. What is the deltaG for the conversion of glucose into lactic acid
A wooden artifact from a Chinese temple has a activity of 43.3 counts per minute as compared with an activity of 58.2 counts per minute for a standard of zero age
A ball rolls horizontally with a speed of 8.1m/s off the edge of a tall platform.If the ball lands 6.1m from the point on the ground directly below the edge of the platform
A Geiger counter consists of a tube of radius r and legnth L centered around a positively charged filament of equal length. What answer do you get for the linear charge density of the filament if you
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.20×106N, What is the total work done by the two tugboats on the supertanker
Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm) per gram of carbon. If a contemporary wooden chair were somehow preserved for the next 3,900 years, what 14C
A 25 horsepower motor consumes 21 kW of electricity, Calculate the heat loss of the motor (kW) and Calculate the efficiency of the motor
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
Calculate how much energy in the form of heat is available from 100mL of this mixture and compare it with the amount from pure gasoline.
If the maximum acceleration that is tolerable for passengers in a subway train is 2.45 m/s2 and subway stations are located 840 m apart, What is the travel time between stations
When hydrogenating methyl trans-cinnamate or dimethyl fumurate using 5% Pd/C at room temperature, how will you determine if the reaction is chemoselective
Benzene (C6H6) is a trace component of gasoline. What is the mole ratio of benzene to n-octane in the vapor above a solution of 35.0% benzene and 65.0% n-octane by mass at 25 degrees C
Two trains, each having a speed of 27 km/h, are headed at each other on the same straight track, What is the total distance the bird travels before the trains collide
Predict whether each of the following oxides is acidic, basic, amphoteric, or neutral: CO2, NO2, Al2O3, CaO.