1.The three most electronegative elements are O, F, N. True   False   2.The three most electronegative elements are O, F, N. True   False     3.Unequal sharing of the electron pairs in a covalent bond causes the bond to be nonpolar. True   False     4. The chemical bonds in a water molecule are polar covalent. Group of answer choices True False

Matching: Some words will be used more than once! 11. Alloy a. gatorade 12. Aqueous solution b. salt 13. Solute c. water 14. Solvent d. oil 15. Soluble in water e. Blue cheese salad dressing 16. Insoluble in water f. Coffee with creamer 17. Suspension g. Oil and water 18. Colloid h. brass 19. Homogenous Solution i. milk 20. Heterogenous Solution j. Muddy water 21. Miscible 22. Immiscible

2. . questions below. Assume the following pKa values: N-terminal –NH3®, 7.0; all -COOH groups, 4.0; Arg, 12.5; Cys, 8.4; His, 6.0; Lys, 10.0; Tyr, 10.0. Calculate the overall charge (pH 7) on the following three polypeptides and answer the (A) Ser-Tyr-Ser-Met-Glu–His–Phe–Arg-Trp-Gly-Lys-Pro–Val-Gly-Lys-Lys-Arg-Arg-Pro-Val-Lys–Val-Tyr-Pro-Asp-Ala -Gly- Glu--Asp-Gln- Ser-Ala-Glu-Ala-Phe-Pro-Leu-Arg-Glu-Phe (B) Ser-Tyr-Ser-Met-Glu–His–Phe-Arg-Trp-Gly-Ala-Pro-Val-Gly-Glu-Glu-Cys-Asp-Pro-Val-Glu–Val-Tyr-Pro-Asp- Ala-Gly-Glu-Asp-Gln-Ser-Ala-Glu-Ala-Phe-Pro-Leu-Glu–Phe-Cys-Ser-Tyr-Ser-Met–Glu–His-Phe-Asp-Trp-Gly- Asp-Pro-Val-Gly-Pro-Asp-Ala-Gly-Asp-Gln-Pro-Val-Gly-Glu-Glu-Cys-Asp-Pro-Val-Glu-Val-Tyr-Pro-Asp-Ala (C) Gly-Ser-Val-Arg-Asp-Pro-Val-Lys-Glu-Val-Tyr-Pro-Asp- Lys-Ala-Gly-Arg-Glu-Ser-Arg-Ala (g) Which of the three peptides would migrate the furthest away from the anode in isoelectric fo- cusing (h) Which of the peptides would migrate the closest to the cathode in isoelectric focusing?…

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