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In most cases the solid substance on the TLC plate (called the "stationary phase") is quite polar. Often it is SiO2, called silica gel, which is actually very clean and finely ground sand. Polar substances tend to interact quite strongly with the polar stationary phase and so can be moved up the plate only by using a very polar solvent. Nonpolar substances interact weakly with the silica gel and move up the plate readily with nonpolar solvents. Suppose you have a mixture of the following solids: iodine (I2), benzophenone (H5C6-C(=O)-C6H5), benzoic acid (C6H5-C(=O)-OH), and oxalic acid (HOOC-COOH). You dissolve a small quantity of the solid mixture in ethanol and spot the solution on a TLC plate. You develop the plate using carbon tetrachloride, CCl4. Which of the 4 substances should have the largest Rf value? Which the smallest? Explain why.
For what signs of ?H and ?S will a process be spontaneous at high temperatures but not at low temperatures? not be spontaneous at any temperatures
How would the rate of disappearance of ethyl bromide change if the solution were diluted by adding an equal volume of pure ethyl alcohol to the solution? The reaction between ethyl bromide (C2H5Br) and hydroxide ion in ethyl alcohol
Balance the following equation in acidic solution using the lowest possible integers and give the coefficient of water
the definition of Lewis acid and base but when the problem like below is given i don't know what to do. Can you thoroughly explain step by step to figure out which is which?
How many grams of magnesium chloride must be dissolved in 568 g of water to give a solution that freezes at -2.38°C
a solution of water kb0.512 c and glucose freezes at 4.15. what is the molal concentration of glucose in this solution?
What is the molarity of a solution in which 2.69 g of C12H22O11 (MM=342.29 g/m) is dissolved in enough water to make 225 mL of solution?
Hydrogen peroxide undergoes a first-order decomposition to water and O2 in aqueous solution. The rate constant at 25 °C is 7.40 * 10-4 s-1. Calculate the volume of O2 obtained from the decomposition of 1.00 mol H2O2 at 25 °C and 740 mmHg after 20...
What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?
calculate the amount of heat required to completely sublime 34.0g of solid dry ice at its sublimation temperature. the
According to the Balmer-Rydberg equation, transitions from n= 5 to m= 2 result in a photons of light that give rise to a spectral line with what color
Diffussion controlled electrolysis proceeds on (a) planar and (b) spherical electrode under the conditions: n = 1, C = 1 mM, A= 0.04 cm^2, D = 1.5x10^-5 cm^2/s.
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