CHEM 101 WINTER MAKEUP EXAM

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1 CHEM 101 WINTER MAKEUP EXAM On the answer sheet (Scantron) write you name, student ID number, and recitation section number. Choose the best (most correct) answer for each question and enter it on your answer sheet. Avogadro s Number: mol -1 R = L atm mol -1 K -1 1 atm = 760 Torr = 760 mm Hg P 1 V 1 / n 1 T 1 = P 2 V 2 / n 2 T 2 PV = nrt d = PM / RT 1. Please chose the letter a as your answer for this question. 2. VSEPR is based upon the principle that the shape of a molecule or ion is determined by a. the size of the electrons in the valence shell of the central atom. b. the velocity of the electrons in the valence shell of the central atom. c. the repulsion of electrons in the valence shell of the central atom. d. the attraction of electrons in the valence shell of the central atom. e. the mass of the electrons in the valence shell of the central atom. 3. Using VSEPR Theory, predict the electron-pair geometry for two, three, four, five, and six electron domains, respectively. a. linear, triangular pyramidal, tetrahedral, triangular bipyramidal, octahedral b. linear, triangular planar, tetrahedral, square pyramidal, octahedral c. bent, triangular pyramidal, tetrahedral, triangular pyramidal, octahedral d. linear, triangular planar, tetrahedral, T-shaped, hexagonal e. linear, triangular planar, tetrahedral, triangular bipyramidal, octahedral 4. Which of the following central atoms would be expected to accommodate more than four electron pairs in some of its compounds? a. fluorine b. boron c. xenon d. carbon e. helium

2 5. Use VSEPR Theory to predict the X-A-X angles for the following compounds: CO 2, GeF 4, BCl 3 a , 109.5, b , 90, 90 c , 90, d. 180, 109.5, 120 e. 180, 90, In VSEPR Theory, electron-pair geometry will be the same as molecular geometry in molecules with a. at least one lone pair of electrons on the central atom b. no lone pairs of electrons on the terminal atoms c. a central atom which is a nonmetal d. no lone pairs of electrons on the central atom e. more than one octet around the central atom 7. For which of the following will the electron-pair geometry be different than the molecular geometry? a. NH 4 + b. CO 2 c. CH 4 d. BH 3 e. H 2 S 8. In a molecule with triangular bipyramidal electron-pair geometry, where are any lone pairs on the central atom preferentially placed? a. axially b. equatorially c. there is no preferential placement of lone pairs d. there can be no lone pairs on the central atom to obtain a bipyramidal electron-pair geometry e. the placement depends on the atoms involved 9. Which of the following correctly list the relative strengths of electron-pair repulsions? a. bonding pair-bonding pair > lone pair-bonding pair > lone pair-lone pair b. lone pair-lone pair > lone pair-bonding pair > bonding pair-bonding pair c. lone pair-lone pair > bonding pair-bonding pair > lone pair-bonding pair d. lone pair-bonding pair > lone pair-lone pair > bonding pair-bonding pair e. bonding pair-bonding pair > lone pair-lone pair > lone pair-bonding pair

3 10. Which of the following shows a polar molecule followed by a non-polar molecule? a. BF 3 SO 2 b. H 2 Se CF 4 c. N 2 NCl 3 d. GeF 4 PH 3 e. CO 2 IF 11. London (dispersion) forces exist a. for all molecules. b. only for molecules with nonpolar bonds. c. only for molecules with polar bonds. d. only for molecules with metallic bonds. e. only for molecules with hydrogen bonding. 12. Of the sets of molecules shown, which entire set undergoes extensive hydrogen bonding? a. HBr, HCl, HF, H 2 O b. H 2 O, HF, NH 3 c. CH 4, H 2 O, HF, NH 3 d. H 2 S, H 2 O, HCl, HF e. AsH 3, NH 3, HF, H 2 S 13. What is the major type of force that must be overcome to allow the vaporization of bromine? a. ion-dipole forces b. dipole-dipole attractions c. hydrogen bonding d. covalent bonds e. London (dispersion) forces 14. Based on temperature, there are four main layers to our atmosphere. Which of the following is the correct name for the layer in which we live? a. troposphere b. thermosphere c. stratosphere d. mesosphere e. ionosphere

4 15. One atmosphere of pressure is equal to 760 mm Hg. This unit is used in the common barometer and manometer. Determine the height (in mm) of a column of ethanol if the pressure is 1.5 atmosphere. The densities of mercury and ethanol are g/cm 3 and 0.79 g/cm 3, respectively. a b c. 26 d. 44 e If, at constant temperature, the volume of a flask equipped with a moveable piston is increased to 16 times its original volume, what must happen to the pressure of the gas inside? a. It is increased by a factor of four. b. It is increased by a factor of sixteen. c. It is reduced to 1/8 the original pressure. d. It is reduced to 1/16 the original pressure. e. It remains the same as the original pressure. 17. Which statement about ideal gases and the gas laws is false? a. Most gases are ideal, or almost ideal gases, at room temperature and atmospheric pressure. b. The laws are summarized as equations that describe the behavior of ideal gases. c. Variables that appear in the laws are temperature, pressure, volume, and amount of gas. d. All gases will behave ideally under all conditions of temperature and pressure. e. The laws describe the macroscopic behavior of ideal gases. 18. If a 2.0-liter sample of gas experiences a decrease in pressure from 1.74 atm to atm at 25 C, what is the resulting volume (in L) at 25 C? a L b L c. 1.9 L d. 6.3 L e. 20 L 19. Which concept is not associated with the kinetic-molecular theory of gases? a. No energy is lost when gas molecules collide with each other. b. Gas molecules move randomly in all possible directions at various speeds. c. The average kinetic energy of gas molecules increases as the temperature increases. d. Under ideal gas conditions, the distance between gas molecules is the same as the diameter of the gas molecules. e. On average, the forces of attraction and repulsion between separate gas molecules are minimal.

5 20. What is the pressure (in atm) exerted by a 2.00 mole sample of gas that occupies 2.50 L at 34 C? a b c d e Suppose that at STP a gas occupies 10.2 L. At what temperature ( C) will the same gas occupy ml at 1550 Torr? a. 273 b. 819 c. 546 d e What is the density of oxygen gas (O 2 ) at STP? a g/l b g/l c g/l d g/l e. 716 g/l 23. If a 25.0 gram sample of zinc is reacted with excess HCl, what volume of hydrogen gas would be evolved at 0.9 atm and 313 K? Zn (s) + 2 HCl (aq) ZnCl 2 (aq) + H 2 (g) a L b L c L d L e L 24. What is a possible molecular formula for a gas that has a density of 1.45 g/l at 21.0 C and 1.25 atm? a. CH 4 b. Cl 2 c. CO d. O 2 e. NO 2

6 25. For a gas mixture a. the partial pressures of the gases at equilibrium are equal. b. the total pressure is equal to the maximum partial pressure. c. the total pressure is equal to the sum of the partial pressures. d. the lightest gas will have the lowest partial pressure. e. the lightest gas will have the highest partial pressure. 26. A mixture of H 2 (g) and Cl 2 (g) exerts a total pressure of 2.50 atm. If the mole fraction of H 2 is 0.350, what is the partial pressure (in atm) of Cl 2? a b c d e. 7.14

7 CHEM 101 WINTER MAKEUP EXAM SHORT ANSWER 1. ANS: a 2. ANS: C PTS: 1 3. ANS: E PTS: 1 4. ANS: C PTS: 1 5. ANS: D PTS: 1 6. ANS: D PTS: 1 7. ANS: E PTS: 1 8. ANS: B PTS: 1 9. ANS: B PTS: ANS: B PTS: ANS: A PTS: ANS: B PTS: ANS: E PTS: ANS: A PTS: ANS: A PTS: ANS: D PTS: ANS: D PTS: ANS: D PTS: ANS: D PTS: ANS: B PTS: ANS: C PTS: ANS: A PTS: ANS: E PTS: ANS: C PTS: ANS: C PTS: ANS: D PTS: 1

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