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1. What is the effect of insoluble impurity, such as sodium sulfate, on the observed melting point of a compound?
2. 3 test tubes labeled A,B & C, contain substances with approximately the same the same melting points. How could you prove that the test tubes contain 3 different chemical compounds?
3. One of the most common causes of inaccurate melting points is too rapid heating of melting point bath.Under this condition how will the observed melting point compare to the true melting point?
The concentration of Pb2+ in a commercially available standard solution is 1.000 mg/mL. What volume of this solution should be diluted to 6.0 x 10^2 mL to produce a solution in which the concentation of Pb2+ is 0.0505 mg/L
What mass of H2C2O2 is required to prepare 250 mL of a 0.15 M H2C2O4 solution
a 265- flask contains pure helium at a pressure of 757 . a second flask with a volume of 485 contains pure argon at a
An aqueous solution of an acid HX has a pH of 5.34,what is the value of Ka for HX and calculate the percentage dissociation of HX in the solution
Hydrogen has two naturally occurring isotopes 1H (mass= 100783), and 2H (mass= 2.0140). If the atomic weight of hydrogen is given as 1.0079, which one is the more abundant isotope
Calculate the pH during the titration of 100.0 mL of 0.200 M HCl with 0.400 M NaOH. First what is the initial pH (before any NaOH is added)? What is the pH after 31.9 mL of NaOH are added?
What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the following equation?
Consider the following balanced chemical reaction: 3FeCl2 + 2Li3PO4 ---> 6LiCl + Fe(PO4)2. How many liters of a 2.50 M FeCl2 solution are needed to completely react with 96.2 mL of a 1.78 M Li3PO4
a 0.4196 grams xhx mole fraction of hx solution of an acid hx has a density 1.141 gml and the molar mass of the acid
Draw a flow chart showing the procedure and the observations to be expected at each step with each of the possible cations.
Rate Law for Proposed Mechanism, Consider the reaction 2NO(g) + O2 ---> 2NO2 (g). The following mechanism has been proposed to explain the experimental rate law
A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At0?C, the volume of the gas is 248 mL. To what temperature must the gas be heated to occupy a volume of 479mL.
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