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Chemistry lab, Explain why the addition of S2-ion to Cr(OH)3 does not result in the formation of Cr2S3. The addition of S2- ion to Fe(OH)2 results in the formation of Fe2.
Bill of rights, Assignment 3: Bill of Rights When the Constitution was completed in the summer of 1787, approval by representatives from nine of the thirteen states was needed for it to become the
Industrialization, why did the great railroad strikes of 1877 and the haymarket square riot cause the public to resent the labor movement?
Write a balanced equation for the reduction of 9-fluorenone to 9-hydroxyfluorene by sodium borohydride. What is the limiting reagent in the following procedure?
897.4 grams of sodium sulfide reacts with excess nitric acid. What volume of H2S gas is produced if the reaction is carried out at 760. Torr and 298 K?
The directions tell you to dissolve 680g of sodium hydrogen sulfate, NaHSO4, in 3.4L of water. What is the concentration of this solution in g/100mL?
If 0.50 mol of COCl2 is placed in a 2.0L flask, what will the concentration of all the reactants and products be when the reaction reaches equilibrium at 527 degrees C?
A 4.305-gram sample of a nonelectrolyte is dissolved in 105 grams of water. The solution freezes at -1.23°C. Calculate the molecular weight of the solute. Kf for water = 1.86°C/m.
Calculate the volumetric size of a water molecule in vapor, assuming 1 mole of the vapor occupies 22.4 L, as if the vapor were an ideal gas.
A roller coaster goes through a complete loop. If the train is given an initial speed of v0 = 30 m/s, what is the largest value that the radius R can have if the car is to remain in contact with the
The antifreeze in a car was a 50% by weight solution of ethylene glycol C2H6O2 in water. Calculate the boiling point and freezing point of this solution. (for H2O: Kb= 0.52 C/m... Kf=1.86 C/m.
Calculate the maximum number of moles and mass of iodic acid (HIO3) that can form when658 g iodine trichloride reacts with111.2 g water. What mass of the excess reactant remains?
A closed circuit consists of two semicircles of radii 37 and 20 cm that are connected by straight segments. A current of 3.2 A flows around this circuit in the clockwise direction. Find the magnetic
Calculate the vapor pressure of the solver over the solution at 25 degrees C. The vapor pressire of pure water at 25 degrees C is 23.8 mm Hg.
When he accelerates from a stoplight, the tassel deflects backward toward the rear of the car at an angle of 7o relative to the vertical. Find the tension in the string holding the tassel.
If the block compresses the spring 4.8 cm before coming to rest, what is the force constant of the spring?
A helicopter propeller blade starts from rest and experiences a constant angular acceleration of 10.5 rad/s2. Find the speed of a point on the blade 5.35 m from the axis of rotation when the blade h
Suppose that the coefficient of friction between your feet and the floor, while wearing socks, is 0.250. Knowing this, you decide to get a running start and then slide across the floor.
Suppose we start with 0.300 mol of N2O5(g) in a .500L container. How many minutes will it take for the quantity of N2O5 to drop to .030 moles?
An object with a height of 10 cm is reflected from a mirror. The image reflected from the mirora is INVERTED and has a height of 5 cm . What is the magnification of the mirror?
What is the force of attraction between the two, if the separation is the Bohr radius? Give answer in nN (nanoNewtons), 2 significant digits. Make sure you use the Coulomb law written in SI units
The speed of light in a vacuum is 3*10^8 m/s . The speed of light whitin a particular substance is 1.5 * 10^8 m/s. The index of reflaction of the substance is:
Compute the momentum of a water molecule at normal conditions, assuming its kinetic energy (mv2 /2) is equal to (3kB T/2).
A uniform rod of length 200cm is bent at its midpoint into a right angle. Then the bent rod is placed along the negative x and positive y axes, with the bent point located at the origin. What is the
How much work is needed to lift a water molecule by 15 km? Pretend that the gravity force is the same throughout. Give answer in Joules, 2 significant digits.