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Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error. (1pt each)
a. A two-component mixture containing 1-octene and 1,4-dimethylbenzene gave only one spot with an Rf value of 0.95. The solvent used was acetone.
b. A two-component mixture containing a dicarboxylic acid and tricarboxylic acid gave only one spot with an Rf value of 0.05. The solvent used was hexane.
c. When a TLC plate was developed, the solvent front ran off the top of the plate.
the mineral greenockite is a yellow sulfide of cadmium that is 78.0% cadmium and 22.o% sulfer. determine the emipirical formula of greenockite.
What is the value of Keq for the reaction H2(g) + 1/2 O2(g)-> 1/2 H2O(l)?
In the laboratory you are asked to make a 0.648 m cobalt (II) bromide solution using 350 grams of water. How many grams of cobalt (II)
Coal combustion can affect freshwater or marine (saltwater) organisms in different ways. Describe the steps involved in one such way, from combustion to the effect(s) on one species or group of organisms.
How many liters of ethane, measured at 17.0 degrees Celsius and 719 Torr, must be burned to liberate 2.94 X 10^4 kJ of heat?
What is the electron configuration of the atom in the third row of the periodic table that has the smallest ionization energy?
How many grams of C2H4 are needed to react with 0.133 moles of H2O?
A solution contains 9.87 (g) of dissolved silver. How many moles of potassium chloride must be added to the solution to completely precipitate all of the silver?
What volumes of .200 M HCOOH and 2.00 M NaOH would make 300 mL of a buffer with the pH of one made from 475 mL of .200 M benzoic acid and 25 mL of 2.00 M NaOH?
Determining Copper in Brass, 1st I titrated Na2S2O3 and determined the molarity to be 0.164. I am having trouble with the calculations for the dissolution of brass.
How many kilojoules of heat are absorbed when 7.20g of MgO(s) is decomposed into Mg(s) and O2 (g) at constant pressure?
Lyzozyme(The protein) unfolds at a transition temperature of 75.5 degree celsius, the standard enthalpy of transition = 509 kJ/mol. Compute the entropy of unfolding of this protein at the temperature of twenty five degree celsius
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