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What is the minimum concentration of Mg2+ required to begin precipitating Mg(OH)2(s) in a solution of pH 10.82? For Mg(OH)2
How many grams of dry NH4Cl need to be added to 2.50 L of a 0.500 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? Kb for ammonia is 1.8*10^-5.
A tanker carrying 800 kg of BOD waste accidently overturns and spills into a pond with a volume of 100,000,000 L. Assume the pond is completely mixed and has an initial DO of 6.4 mg/L and a temperat
The saturation value of DO is 8.5 mg/L. The deoxygenation coefficient (kd) is 0.61/d, and the reaeration coefficient (kr) is 0.76/d. Assume complete and instantaneous mixing of the sewage and river.
Some wastewater has a BOD5 of 150 mg/L. The reaction rate is 0.23/d. What is the ultimate carbonaceous BOD
a TeflonTM-filled parallel-plate capacitor having a plate area of 200 cm2 and insulation thickness of 0.0400 mm, find the maximum voltage that can be applied to this capacitor
An electron is moving east in a uniform electric field of 1.53N/C directed to the west. What is the speed of the proton at point B
The initial DO of the mix is 9.0 mg/L. After 5 days, the DO is 4.0 mg/L. After a long period of time, the DO is 2.0 mg/L, and it no longer seems to be dropping. Assume nitrification has been inhibit
An object is 15 cm in front of a diverging lens that has a focal length of -8.7 cm. How far in front of the lens should the object be placed
Compare the speed of sound following from that slope to the calculated speed of sound from the gas properties
A voltaic cell operating under standard conditions (1.0 M ion concentrations) utilizes the following reaction: 3 Pb(s) + 2 Co3+(aq) <=> 3 Pb2+(aq) + 2 Co(s) What is the effect on the cell emf
The springs of a 1500 kg car compress 5.0 mm when its 68 kg driver gets into the driver's seat. what will be the frequency of vibrations
A beaker with 170 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.70 mL of a 0.370
A charge of -2.205%u03BCC is located at (2.630m , 4.253m ), and a charge of 1.765%u03BCC is located at (-2.793m , 0). Find the electric potential at the origin
A sample of gas weighs 4.542g and has a volume of 870.0mL at 945.0 torr and 39.0 degrees Celsius. What is the molar mass
If the angular magnification of an astronomical telescope is 38 and the diameter of the objective is 66 mm, what is the minimum diameter of the eyepiece
The four unit separation train shown in figure 1.1 has been designed to separate 1000 gmol/hr of a hydrocarbon feed containing 20% CH4, 25 % C2H6
A 1200 kg car is traveling at 3.00 m/s and strikes a wall. The 1200 kg car bounces off the wall with a velocity of 4.00 m/s. then the average force on the car is
A movie camera with a (single) lens of focal length 70 mm takes a picture of a person standing 24 m away. what is the height of the image in millimeters on the film
A machinist turns the power on to a grinding wheel, at rest, at time t=0 s. What is the angular velocity in the time interval from t=0 to t=25s
What radioactive isotope emits a beta particle to give magnesium-24? a. sodium-24 b. silicon-28 c. aluminium-24 d. magnesium-25
The magnetic field in an electromagnetic wave has a peak value given by B = 5.0?T. For this wave, find the peak electric field strength
What is also produced when aluminium-27 is bombarded with deuterium to give aluminium-28? a. neutron b. proton c. positron d. electron
A television is tuned to a station broadcasting at a frequency of 6.30×10^7Hz. Find the optimum length of the antenna
Two negative charges, Q = -30 \mu C are placed on the x-axis at x = +0.25 m and x = -0.25 m. How much energy does it take to assemble these two charges