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1.What is the effect of the following on the observed melting point of the compound: a) insoluble purity, such as charcoal; b) incomplete drying of the sample; c) less recrystallization solvent was used than it was needed?
2. Three test tubes, labeled X,Y, and Z, contain substances with approximately the same melting point. How could you prove that the three compounds are different?
What is the pH after 13.3 mL of base is added? The Ka of butanoic acid is 1.5 X 10^-5.
What volume will 500 mL of gas at 20°C and a pressure of 420 mm Hg occupy if the temperature is reduced to -80°C and the pressure is increased to 650 mm Hg?
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted
solution of the nonvolatile solute ethylene glycol, C2H4(OH)2, in water is prepared. Calculate the vapor pressure of the solution to three significant figures.
The partial pressure of O2 in air at sea level is 0.21 atm. The solubility of O2 is 1.38E-3 at 1 atm. Use Henry's law to calculate the molar concentration of O2 in the surface water of a mountain lake saturated with air at 20°C and an atmospheric ..
How many grams of formic acid, HCOOH, must be added to 0.160 L of 0.150 M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.30? Assume no volume change. Ka of HCOOH = 5.0 10-4.
Diamond has a face-centered cubic unit cell, with four more C atoms in tetrahedral holes within the cell. Densities of diamonds vary from 3.01 g/cm3 to 3.52 g/cm3 because C atoms are missing from some holes.
A sample of vinegar has a freezing point depression of 20 degrees C. What is the estimated percent by mass of acetic acid in the vinegar? Molar mass of acetic acid is 60g/mol.
A sample of pure NO2 is heated to 334 degree C at which temperature it partially dissociates according to the equation 2NO2(g)-->2NO(g)+O2(g)
If a mixture of gases contained 78% nitrogen at a pressure of 984 torr and 22% carbon dioxide at 345 torr, what is the total pressure of the system?
how many liters of oxygen will be produced if 162 grams of aluminum chlorate is decomposed
Write equations to show how nitronium ions might be formed using a mixture of nitric and sulfuric acids
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