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Explain how would the Rf values change if you utilized pure dichloromethane no methanol as the mobile phase for the TLC separation of curcumin? What if you used pure methanol (no dichloromethane)?
A solution is known to contain Bi3+ ion or Cd2+ ion or both. Describe the test(s) that could be used to seperate and identify these ions. Describe the results you would expect to see for each ion, if that ion were present.
Select all of the following that would be acceptable conjugate acid-base pairs to use in the preparation of a pH=9.8 buffer.
Consider the fusion of boron 10 with an alpha particle. The products of the fusion are carbon and a proton. a) Write a nuclear reaction for this process.
Calculate the equilibrium constants of the dissociation and the standard enthalpy of dissociation at the mean temperature.
Many metals are not found in nature in their elemental form, but in minerals which are a combination of elements. The metal is extracted by various means from these minerals.
Calculate the amount of energy (in Kj) necessary to convert 317g of liquid water from 0*c to water vapour at 172*c. The molar heat of vaporization of water is 40.79kj/mol.
Draw the Lewis structures for calcium carbonate and magnesium hydroxide.
MgBr2 and Pb(NO3)2 2) CuSO4 and H2S Write ionic equations (molecular reactions, ionic equations and net ionic equations indicating the spectator ions in these reactions)
calculate the molality of each of the following solutions.a 15.9 g of sucrose c12h22o11 in 690. g of waterb 7.38 moles
For a 0.13 M solution of formic acid, HCOOH, the pH = 2.40. Calculate Ka for formic acid.
Assuming that the heat capacities don't change with temperature, how much energy in kilojoules is needed to heat 5.25g of Hg from a temperature of -59.5C to 43.0C
What mass of ethylene glycol must be added to 846.7 grams of qater to increase the boiling point to 101.05 Celsius
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