Biochemistry Module 2 Exam CHEM 210 - Portage Learning Questions With Complete Solutions

The pH of a solution of 3.2 x 10-10 M NaOH is: A. 3.7 B. 3.7 x 10-10 C. 4.5 D. 13 E. 8.7 correct answer: C. 4.5 Which attribute contributes to water's unusual properties? A. The geometry of the molecule B. The polarity of the O-H bonds C. The ability of water molecules to hydrogen bond D. The bond angle of water E. All of the answers are correct correct answer: E. All of the answers are correct What factor contributes to the bent shape of a water molecule? correct answer: The unshared electron pairs on the oxygen atom Which diagrams correctly represent a hydrogen bond? correct answer: A and D The H+ concentration of a solution is 5.6 x 10-5 What is the pH? correct answer: 4.25 If the Ka of an acid is 7.45 x 10-10, what is the pKa? correct answer: 9.13 List the acids in INCREASING order of strength (weakest to strongest): Nitrous acid (Ka = 4.0 x 10-4); acetic acid (Ka = 1.7 x 10-5); phosphoric acid (Ka = 7.3 x 10-3) correct answer: Acetic acid, nitrous acid, phosphoric acid Elemental bromine (Br2) is a liquid at room temperature. What is the dominant attractive force that exists between Br2 molecules in the liquid? correct answer: London Forces Which one of the following molecules can form a hydrogen bond?