Test Prep for Exam 2. Note: This Test Prep is not intended to take 50 minutes. This Test Prep is not intended to be an accurate representation of the format of the questions that you will see on the exam. This Test Prep is not meant to be comprehensive of everything you should know for the exam. However, it is intended to give you additional practice on problems related to many of the learning objectives of this section of the course. 1. Complete the below MO diagram for N2 2. Complete the below MO diagram for N2+ 3. Complete the below MO diagram for N2- 4. Which has the strongest bond as predicted by MO theory? N2, N2+, or N2-? 5. Which has the shortest bond length as predicted by MO theory? N2, N2+, or N2-? 6. A deep sea diver takes a breath at the surface of the water (where the pressure is exactly 1.00 atm) and fills their lungs with 5.28 L of air. What volume will the air in their lungs occupy when the diver travels underwater to a depth where the pressure is 1.92 atm? (Assume the temperature remains the same at the surface of the water and under water.) 7. If the temperature of a sample of gas is doubled, and the volume is decreased by half, what change (if any), occurs to the number of moles of gas in the sample? a. b. c. d. e. The number of moles of gas is quadrupled The number of moles of gas is decreased by half The number of moles of gas remains the same The number of moles of gas is decreased by ¼ It is not possible to determine without the actual temperature and volume being provided 8. True or False. At constant temperature and pressure, 0.50 moles of H2 (g) and 1.0 mole of He (g) will occupy the same volume. 9. A gas mixture contains four moles of He and 1 mole of Ne. The partial pressure of Ne is… a. b. c. d. e. ¼ of the total pressure ¾ of the total pressure 1 atm 1/5 of the total pressure 4/5 of the total pressure 10. A fixed number of moles of Xe gas is placed in a sealed container with a constant volume. If that sealed container is then cooled from room temperature to 0 °C, what is the overall result to the pressure present inside the container? 11. Below are 2 Lewis structures. Are these resonance structures of each other? Or rather, are these 2 separate, distinct molecules? Justify your answer. 12. Determine which of the above molecules is polar (contains an overall molecular dipole) and which is nonpolar (does not contain an overall molecular dipole)? Justify your answers. 13. Determine which intermolecular forces will be present between two molecules of SO2. 14. Determine which intermolecular forces will be present two molecules of tetrahydrofuran. Lewis structure is pictured below. 15. Determine which will have a higher vapor pressure? Methylethylamine (pictured below on the left) or ethylamine (pictured below on the right). Justify your answer. 16. Determine which will have a lower freezing point? Br2 or Cl2? Justify your answer 17. Determine which will have a higher boiling point? Pure water or salt water (NaCl dissolved in water)? Justify your answer. 18. Two molecules of HF can hydrogen bond with each other. Draw the Lewis structures of 2 HF molecules, shown oriented to each other such that they are interacting through a hydrogen bond.
