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A colorless unknown substance is spotted on a TLC plate and developed in the correct solvent. The spots do not appear when visualization with a UV lamp or iodine vapors is attempted. What could you do to visualize the spots if the compound is: a.) An alkyl halide b.) A ketone c.) An amino acid d.) A sugar
Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).
Compute the number of moles of H2O will be formed from the reaction 75.1g benzene?
A 1.00-mol sample of an ideal monatomic gas is compressed isothermally and irreversibly in one step from 2.50 atm to 6.50 atm at 300.0 K. Calculate G for this process.
Given the following equation, how many grams of PbCO3 will dissolve when 1.5L of 1.00 M H+ is added to 6.00g of PbCO3? PbCO3(s) + 2H+(aq) = Pb^2(aq)+ +H2O (l)+ CO2(g)
How can one confirm the identity of a peak in a chromatogram. How does one choose a solvent in HPLC
A gas expands and does P-V work on the surroundings equal to 328 J. At the same time, it absorbs 108 J of heat from the surroundings. Calculate the change in energy of the gas.
The pH of uncontaminated rain water is about 5.6. The pH of rain falling in Cleveland, OH is 4.2 and that in Omaha, NE is 5.5. What is the concentration of hydrogen ions in the rainfall of each city? [H] 6.3 ^ -5 for Cleveland.
Analysis of an unknown solution produces absorbance values of: 0.45 @ lambda max for B 0.75 @ lambda max for A What is the molar concentration of the unknown
For a dehydration reaction in metabolism, wherein water is removed from an alcohol to create an alkene: a. Requires NAD+ b. is an example of substrate oxidation c. Requires NADH d. is not a redox reaction and does not need an external e- acc..
Calculate the potential delivered by a voltaic cell operating by the following reaction if all of the dissolved species have a concentration of 0.035 and the pressure of H2 (g) is 1.00 atm.
Aspirin has a pKa of 3.5 and is neutral in its protonated form (i.e. HA). Acetaminophen has a pKa of 9.5 and is also neutral in its protonated form. Predict the elution order of the two compounds in capillary electrophoresis.
Calculate the molar mass that would be obtained from the actual experimental data under the following conditions. The unknown is methyl propyl ether (CH3OC3H7)
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