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1. a. For the following two peptides, draw the chemical structure of both peptides, indicating where the peptide bonds are.
(1a) Pro-Lys-Phe-Asp (ii) His-Tyr-Arg-Trp
1b. Draw a titration curve for both of these peptides. Be sure to label the axes properly, indicate the pKa values, the equivalence points and the buffering regions.
Explain how mass effects act to lower the carbonyl frequency, as well as how inductive and hyperconjugation effects act to raise the carbonyl frequency
The complete combustion of acetylene, C2H2(g), produces 1300. kJ of energy per mole of acetylene consumed. How many grams of acetylene must be burned
The normal boiling point of liquid bromine is 58.8oC, and its molar enthalpy of vaporization is Delta Hvap = 29.6 kJ/mol. (a) When Br2(l) boils at its normal boiling point, does its entropy increase or decrease?
If 30.0mL of 0.500M KOH are needed to neutralize 10.0mL of HCl of unknown concentration, what's the molarity of HCl?
Calculate the percent (by volume) of air that would be displaced when all of theN2 (l) get evaporated. it is given that Liquid nitrogen has a density of 0.807 g/mL
A sample containing 0.187 g Cl- is dissolved in 50.0 mL water. How many moles of Cl- ion are in the solution? What is the molarity of Cl- ion in the solution?
Consider the TCA reaction that is catalyzed by alpha-ketoglutarate dehydrogenase. Which of the following accurately describes this process? Mark all that apply
Calculate the number of kilograms of helium needed to inflate a balloon to a volume of 100,000 L at an atmospheric pressure of 250 mmHg and a temperature of -35 °C.
A 155 mL sample of rainwater is titrated using 0.0095 M NaOH solution. If 4.8 mL of the NaOH solution was required to reach the endpoint, what was the pH of the rainwater?
How can you distinguish chemically between starch and three other carbohydrates (sucrose, glucose, & lactose)? What would you expect to observe when adding one drop of iodine-potassium iodine reagent to each of the four carbohydrates?
Using the equation Fe2O3+2Al-->2Fe+Al2O3, how many grams of Al are needed to completely react with 135 g Fe2O3
How many molecules of HCCH react with 143 molecules of oxygen to produce carbon dioxide and water?
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