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Draw a generic structure of an amino acid at physiologic pH. A biochemist intends to synthesize a highly polar polypeptide with no hydrophobic core. What amino acids are preferred for this polypeptide? Draw the side chain structure of each amino acid that can be used for this polypeptide. Label them with both three letter and single letter codes.
solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. Write a balanced chemical equation for this reaction.
Explain briefly how you could prepare the buffer solution in (a) if you had available the solid salt of the only one member of the conjugate pair and solution of a strong acid and a strong base.
A 21.496 g sample of magnesium is burned in air to form magnesium oxide and magnesium nitride. when the products are treated with water, 2.813 g of gaseous ammonia are generated.
Using a table of standard reductions, determine what the potential of each reduction below would be versus the S.C.E. a. Ag+ (aq) + e - ? A(s) b. Ni2+(aq) + 2e- ? Ni (s)
An analysis of fatty acids is desired. These fatty acids have boiling points in excess of 275O C. The sample is extracted with methanol to obtain a solution that only contains the fatty acids.
If the pressure of chloroform vapor in a flask is 154 mm Hg at 25.0°C, and the density of the vapor is 1.25 g/L, what is the molar mass of chloroform?
If the actual yield is 220.0 g and the theoretical yield is 275.6 g then what will be the percent yield of ferrous sulfide.
Calculate the solubility of zinc hydroxide, Zn(OH)2, in 1.00 M NaOH. Ksp = 3.0 × 10-16 for Zn(OH)2, Kf = 3.0 × 1015 for Zn(OH)42-
Consider equal volumes (say 1 rm L) of a substance in the solid, liquid, and gas phases. Arrange them in order of decreasing mass. If the mass difference between samples is relatively small, rank the items as equivalent.
Why should a distilling flask be filled to not more than two-thirds of its capacity at the beginning of a distillation procedure?
25.0 mL of a gas with a pressure of 1.00 atm is contained in a balloon at 25.0 C. The balloon is then cooled to 5.0 C, and the pressure is found to be 0.750 atm. What is the volume of the gas under the new conditions?
Hydration of alkynes (via oxymercuration) gives good yields of single compounds only with symmetrical or terminal alkynes
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