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Explain the following observations in terms of shifting equilibria by le Chatelier's principle. Write the equation for the equilibrium involved in each case.
a) BaCrO4 is insoluble in basic solution, but dissolves readily in acidic solution.
b) The addition of NaOH to the Fe3+ + SCN-=====FeSCN2+ equilibrium causes color change and a precipitate to appear.
c) The solubility of PbCl2 in .10M HCl is much lower than in pure water.
d) CaC03 is an insoluble salt, but will dissolve in acid.
solid carbon dioxide co2 dry ice goes directly from solid to gaseous state at -78degc. the molar heat of sublimation is
calculate the theoretical yield of when 108 g of c2h5cl reacts with 236 g of assuming that and react only to form
Which of these is not a protease that acts in the small intestine?
A solution is initially 0.050M in acetate, CH3COO- (Kb = 5.6 x 10^-10). 10.0mL of 0.10 M HCl is added. Write a chemical equation for the neutralization reaction that occurs.
calculate the pH you would expect to measure if 15.0mL of 0.5M acetic acid were mixed with 25.0mL of 0.5M sodium acetate
To qualify to run in the 2005 Boston Marathon, a distance of 26.2 miles, an 18 year old woman had to have competed another marathon in 3 hours and 40 minutes or less. To qualify, what must a woman's average speed have been
A 128.2-mL sample of a 0.15 M solution of H3PO4 is titrated with 0.18 M NaOH. What volume of base must be added to reach the third equivalence point
Consider a system with four energy levels: 0E, 1E, 2E, 3E, where E is kT (E can be represented by epsilon and T is 100K). Assume that there are 10 particles. Provide an expression for energy, heat capacity and entropy. Plot all as a function of T
Ammonia reacts with oxygen according tot he following equation: 4NH3+5O2=4NO+6H2O deltaHrxn = -906kJ Calculate the heat (in kJ) associated with the complete reaction of 155g of NH3.
solution of sodium chloride contains 5.2 g nacl in 900 grams of water. what is the concentration of the solution in
An Atom of the element of Manosium has energy levels 1,2, and 3 with sucessively higher energy. When the atom makes the transition from level 3 to level 1, it emits a photon with wavelength of 500nm.
When silver crystallizes, it forms face-centered cubic cells. The unit cell edge length is 408.7 pm. Calculate the density of silver. (Enter answer to three significant figures.)
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