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Is it possible to separate Ca2+ from Mg2+ by selective precipitation of Mg(OH)2? To be precise, is it possible to precipitate 99.99% of magnesium without precipitating any calcium as hydroxides?
A 700 g mass is placed on a string and oscillates up and down with a period of 1.5 S. If a 1100 g mass were added to the current mass, what would be its period of oscillation?
Calculate the maximum mass of iron that can be obtained from these masses of reactants. Calculate the atom economy for this reaction
An airplane is flying in a horizontal circle at a speed of 106 m/s. The 82.0 kg pilot does not want the centripetal acceleration to exceed 6.76 times free-fall acceleration. Find the minimum radius
An unknown liquid has a density of 2.14 g/mL. How many mL would a 6.42 g sample of this liquid occupy if dispensed into a 5 mL UV/VIS spectrophotometer cuvette?
The Hydrogen gas which is released in the reaction is collected over water at 25 C. The vapor pressure of water at 25 C is 23.8 mmHg. If 3.557 L, at a total pressure of 747 mmHg, are collected, how
A 3.90-L sample of carbon monoxide is collected at 55°C and 0.901 atm. What volume will the gas occupy at 1.05 atm and 25°C?
what is the maximum amount of O2 in grams that can be obtained from 2.00x10^2 of nitroglycerin? calculate the percent yield in this reaction if the same amount of O2 generated is found to be 6.55g.
A rocket is launched at an angle of 54.0° above the horizontal with an initial speed of 100 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 31.0 m/s2.
A student obtains a vinegar solution having an acetic acid concentration of 0.8512 M. What volume of 0.1036 NaOH will be required to reach the equivalence point when 25 mL of the vinegar solution is
An 54.0 N box of clothes is pulled 7.4 m up a 30.0° ramp by a force of 99 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate th
A 60 kg pole vaulter running at 14 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her alt
You throw a 0.375 kg ball straight up with an initial velocity of 13.5 m/s. What is the momentum of the ball at the highest point of its path?
What is the maximum oil level in tank 2? Assume laminar flow in the horizontal pipes, and neglect kinetic, entrance-exit losses.
The equilibrium vapor pressure of water at 25 degrees celsius is 23.76 torr. What is the total pressure inside the flask before the reaction begins?
A 250.0 gram industrial mold absorbs 5,575 calories of heat when it is filled with an alloy. If the specific heat of the mold is 0.275 calories per gram degree Celsius, how much does its temperature
The human body generates heat by the metabolism of carbohydrates and other food materials. How much energy is required to melt the ice and warm the water to the body temperature?
The sensor in the torso of a crash-test dummy records the magnitude of the net external force acting on it. if the dummy is thrown forward with force of 130.0 N while simultaneously being hit from t
A spring hangs vertically. A 500 g mass is then hung on the spring, which stretches the spring 1.3 cm. Calculate the spring constant in units of N/m.
It was estimated that 25 years ago the average farm worker had a body DDT concentration of 22 ppm (parts per million by weight). Estimate what the farm worker's present concentration would be.
Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:4NH3 + 5O2 > 4NO + 6H2O When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent? How much water
A cubical box that has been constructed from uniform metal plate of negligible thickness. The box is open at the top and has edge length L = 36 cm. Find (a) the x coordinate, (b) the y coordinate, a
Assume that when 0.500g of a mixture of hydrocarbons is burned in the bomb calorimeter with calorimeter constant 3.640KJ/C and its temperature rises by 6.76C. How much energy (in KJ) is released dur
Assume that you have 1.55g of nitroglycerin in a 603.0ml steel container at 20.0C and 1.00 pressure. How many mols of gas(air) were in the container originally?
what is the value of the coefficient of the friction if a 95-N horizontal force is exerted to move a 200-kg cart on level ground at uniform speed.