Module 2 BioChem 210 Exam - Portage Learning Questions and Answers 2026

BioChem 210 Module 2 Exam - Portage Learning Questions and Answers 2025

1. The pH of a solution of 0.0010 M NaOH is:: 11 (Kw=[H+][OH-] = 1.0 x 10-14; [H+][0.0010] = 1.0 x 10-14 [H+]=1.0 x 10-11; pH=-log[1.0 x 10- 11]=11) 2. Water is a unique molecule. Which of the following contributes to water's unique place in the chemical world?: All of the answers are correct 3. The bent shape of water is due to ______________.: The unshared electron pairs on the oxygen atom 4. Which diagrams correctly represent a hydrogen bond?: A and D 5. The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?: 2.92 6. If the Ka of an acid is 5.63 x 10-3, what is the pKa?: 2.25 ([pKa = -log(5.63 x 10-3) = 2.25]) 7. List the acids in DECREASING order of strength (strongest to weakest): Nitrous acid (Ka = 4.0 x 10-4); acetic acid (Ka = 1.7 x 10-5); phosphoric acid (Ka = 7.3 x 10-3): Phosphoric acid, nitrous acid, acetic acid 8. Elemental iodine (I2) is a solid at room temperature. What is the dominant attractive force that exists between I2 molecules in the solid?: London forces 9. Which one of the following molecules can form a hydrogen bond? (A.) HBr (B.) HCl (C.) NH3 (D.) CH4 (E.) H2: C. NH3 10. A hydrogen bond can form between a hydrogen atom bonded to oxygen, O-H, and ________.: N 11. In a bond between P and Cl, there exists a difference in electronegativity resulting in partial positive and partial negative charges. If a dipole arrow were added to this structure, which way would the arrow point?: The arrow points from N toward Br 12. The following reaction occurs in glues purchased from hardware stores. Customers use this product to glue plastic together. Epoxy (l) + hardener (l) ö Glue (s) + heat given off What is the sign (+ or -) of the change in ” G and ” H?: ” G is (-) and ” H is (-) 13. Which of the following is the free-energy change of a reaction?: ” G 14. Which of the following is the change in entropy of a reaction?: None of the above 15. : A 16. Which buffer system is used by the renal system to maintain pH balance?- : Bicarbonate buffer system 17. A buffer can neutralize acid and base within a certain limit. We say that this is its:: Buffer capacity