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a. The pKa of aniline, pyrrole and pyridine are: 4.62, -4 & 5.2.
1. Draw and name the acids of which these are the pKa.
2. Give the basicity order? List from most to least basic.
3. Explain the basicity order in terms of resonance and inductive (polar) effects and solvation effects.
b. Amides
1. Explain why amides are much less basic than amines.
2. Explain why amides are about as acidic as alcohols.
What is the wavelength (in meters) of a proton (mass = 1.673*10^-24 g) that has been accelerated to 30% of the speed of light.
Predict the anode, cathode, and overall cell reactions when an aqueous solution of each of the following salts is electrolyzed in a cell having
Calculate the fraction of space that is occupied by packing spheres in the (a) simple cubic, (b) body-centered cubic, (c) face-centered cubic (close packed) structures
A chemist dissolves 0.9 g of an unknown monoprotic (one acidic H) acid in water. She finds that 14.6 mL of 0.426 M NaOH are required to neutralize the acid.
A solution of 100 mL of 0.2 M NH3 is titrated with 50 mL of 0.5 M HNO3. What is the pH of the resulting solution? Kb for NH3 is 1.8 × 10-5.
you dissolve 15.0g of sucrose C12H22O11 in a cup of water (225g) what is the freezing point of solution (kf of water is -1.86).
A solution is prepared by dissolving 0.60g of nicotine in water to make 12mL of solution. The osmotic pressure of the solution is 7.55atm at 25 degrees C
Calculate (a) the mole fraction of the solute, (b) the number of moles of solute in the solution, and (c) the molecular mass of the solute.
Identify the substance produced in the liver that helps catalyze this reaction.
Explain the following observations. 1. Aziridines, compounds that contain nitrogen in a three-membered ring, undergo pyramidal inversion much more slowly than do other alkylamines.
Write the equation for the reduction reaction. D) If the potential of the silver, silver ion electrode, E standard sub Ag+, Ag is taken to be 0.000V in oxidation or reduction, what is the value of the potential for the oxidation reaction, E standa..
A biochemical engineer isolates a bacterial gene fragment and dissolves a 10mg sample in enough water to make 30ml of solution. the osmotic pressure of the solution is .340 torr at 25 degrees C. the molar mass of the gene fragment is 1.81x10^4 g/m..
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