PORTAGE LEARNING BIOCHEMISTRY MODULE 2 EXAM Q&A 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.) PORTAGE LEARNING BIOCHEMISTRY MODULE 2 EXAM Q&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
18.Is a pH of 8.36 acidic, neutral, or basic?: Basic
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.) PORTAGE LEARNING BIOCHEMISTRY MODULE 2 EXAM Q&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
18.Is a pH of 8.36 acidic, neutral, or basic?: Basic
