I was wondering if my answers could be cross-checked and corrected. This is my o

Question

I was wondering if my answers could be cross-checked and corrected. This is my old exam that I've already submitted and received a grade for. I'm studying for my comprehensive final so I would like to know which ones need to be corrected. He gave us back the scantron but none of the questions are marked as "correct" or "incorrect".

Mar Dr. A. of the physical properties of water can be accounted for by the fact that it forms hydrogen bonds c. Many it is an angular molecule e, none of the above d all of the above 2. Example(s) of non-covalent bonds e. a and b d. peptide b. Hydrogen a. Ionic c. disulfide F water an amino group, the water behaves as a weak base When bonds to F When the pH pKa the H+is on the functional group In hydrogen bond formation, the donor group is a weak base Hydrogen bonds are non-cooperative in nature A buffer is made between a strong acid and its conjugate base F Only when the concentration of the conjugate acid and its conjugate base are equal is the pH-pka The titration of an acidic amino acid looks like the titration of a triprotic acid 10. The peptide A-P-L-F-E-v contains how many peptide bonds d. 7 e. can't determine from the information provided. c. 6 a. 4 11. When an acid is added to a buffer solution. The acid reacts with increasing the concentration of the c. base, water d. acid, water e, none b. acid, base base, acid 12. The amino acid with the R group -CH2-CH2-COO- is d. P e. none. b.E 13 If an experiment calls for a solution with buffering capacities around pH 9 will you use a. weak acid plus the salt of the acid eak base plus the salt of the base a strong soluble base strong acid plus strong base e. weak acid plus a weak base The Henderson-Hasselback equation 1 pKa when [acid]/Lbasel- demonstrates 14 graphie determination of the molecular weight of a weak acid from its pH acidic acid and dilute HCl ually useful with dilute solutions of e e. none

Explanation / Answer

Q1.

polarity of water helps to have higher interactions, therefore high cohesion/adhesion and hihg BP and MP

also forms H bonds between OH groups, it is angular molecule so it has a dipole formation, therefore, all these are good solutions

choose D

Q2

noncovalent bonds

Ionic = thi is not ovalent bond, therefore, choose this

hydrogen bonding is not covalent, is another type of interaction

disulfide bond = bond between S-S therefore covalent

peptide = bonds between aminos, therefore covalent

choose on le a and b

Q3

H2O donates H+ to form OH- and the amino groups gets H+, therefore the amine is the weak base and H2O the base, this is FALSE

Q4.

if pH is less than pKa, there are plenty of H+ ion solution, so expect this to be in COOH and NH3+ groupsTrue

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