CHEM 210 Exam 2 2022/ 2023 (UPDATED)

1. The pH of a solution of 0.0010 M NaOH is: A. 1 B. 11 C. 8 D. 0 E. 14 2. Water is a unique molecule which of the following contributes to water’s unique place in chemical world? The geometry of the molecule - The polarity of the O-H bonds - The ability of water molecules to hydrogen bond - The bond angle of water - All answers are correct 3. The bent shape of water is due to - The dipole arrows in a water molecule - The electronegativity different between hydrogen and oxygen - The unequal electron sharing between hydrogen and oxygen - The unshared electron pairs on the oxygen atom - None of the answers are correct 4. Which diagram correctly represents a hydrogen bond - A and D - A and C - C and D - B and D 5. The H+ concentration of a solution is 1.2 X 10-3 M. What is the pH? - -1.20 - 1.20 - 3.12 - -2.92 - 2.92 6. If the Ka of an acid is 5.63 X 10-3, what is the pKa? - 6.86 This study source was downloaded by from CourseH on :20:51 GMT -06:00 - 2.25 - 5.63 - 10.12 - 1.38 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) - Nitrous acid, acetic acid, phosphoric acid - Acetic acid, nitrous acid, phosphoric acid. Correct! - Phosphoric acid, nitrous acid, acetic acid Acetic acid, phosphoric acid, nitrous acid - None of the above 8. Elemental iodine is a solid at room temperature. What is the dominant attractive force that exists betwe