Form Code A. CHM 2045 (Spring 2019) Exam 4 Review (Gower, Polanco)
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1 Form Code A NAME CHM 2045 (Spring 2019) Exam 4 Review (Gower, Polanco) Instructions: On your Scantron form, enter and bubble your name, UFID, and Form Code (see above). Turn in only your Scantron. You may keep your exam sheet and any other papers. Check bubbling carefully: bubbling errors are non-negotiable. 1. Which of the following is true regarding methanol? CH3OH (1) Oxygen has four half filled sp 3 orbitals (2) Carbon and Oxygen are sp 2 hybridized (3) Hydrogen has sp 3 hybridization (4) Only oxygen possesses sp 2 hybridization (5) Carbon and oxygen mix their orbitals to form sp 3 hybridization 2. How many σ and π bonds are in acetone? (CH3)2CO? (1) 9σ and 1π (2) 9σ and 0π (3) 8σ and 1π (4) 9σ and 2π (5) 8σ and 1π
2 3. Given two pairs of molecules: N2:N2 + and O2:O2 +, find the more stable molecule of the two pairs. N2: σ2s < σ2s * < π2p < σ2p < π2p * < σ2p * O2: σ2s < σ2s * < σ2p < π2p < π2p * < σ2p * (1) N2:O2 (2) N2 + :O2 (3) N2 + :O2 + (4) O2:N2 + (5) Both pairs are equal in stability 4. Which of the following is true about B2 +? B2: σ2s < σ2s * < π2p < σ2p < π2p * < σ2p * (1) B2 + is paramagnetic and unstable (2) B2 + is diamagnetic and is unstable (3) B2 + is paramagnetic and is stable (4) B2 + is diamagnetic and is stable (5) B2 + can be either dia- or para- and is unstable
3 5. Why does water vapor at 100 C cause a more severe burn than liquid water at 100 C? (1) Due to the increase in gas, the particles are more free flowing (2) Gas is more kinetically driven than liquid (3) Gas has stronger intermolecular forces (4) The condensation of vapor supplies an additional ΔH value in the overall energy (5) The burn will be the same for either because the temperature is the same for both 6. The vapor pressure of propanol is 100 torr at 52.8 C. If ΔHvap of propanol is 47.5 kj/mol, calculate the temperature (in C) when the vapor pressure is 760 torr. (1) 82.0 C (2) 95.8 C (3) C (4) 355 C (5) 25 C
4 7. The following image below shows a heating-cooling curve for the conversion of water, given: the enthalpy of fusion is 6.01 kj/mol the enthalpy of vaporization is 40.7 kj/mol and that cice = 2.0 J/g*C cgas = 2.08 J/g*C find the heat absorbed when 24.3 g of water goes from stage 1 to stage 3. (1) 1.53 kj (2) 54.9 kj (3) 76.0 kj (4) 57.2 kj (5) 1.35 kj 8. Below is a graph that compares the ΔHvap and ΔHfus Benzene (C6H6), and ethanol (C2H5OH), and water. Label the graph with the correct compounds. (1) A=Benzene, B=Water, C=Ethanol (2) A=Water, B=Ethanol, C=Benzene (3) A=Benzene, B=Ethanol, C=Water (4) A=Water, B=Benzene, C=Ethanol (5) A=Ethanol, B=Water, C=Benzene
5 9. Predict the hybridization of the central atom in each of the following, respectively: H2CCCH2 ; IF4 1 ; IF4 + ; CH2O (1) sp 3 d ; sp 2 ; sp ; sp 3 d 2 (2) sp ; sp 3 d 2 ; sp 2 ; sp 3 d (3) sp ; sp 3 d ; sp 2 ; sp 3 d 2 (4) sp 3 d 2 ; sp 3 d ; sp 2 ; sp (5) sp ; sp 3 d 2 ; sp 3 d ; sp Of the following molecules, which has the greatest surface tension and which has the greatest viscosity? CH3CH2CH2CH3, CH3CH2OH, H2O or CH3CH2CH2CH2CH3? Note, answers are listed as surface tension: viscosity (1) CH3CH2CH2CH3 : CH3CH2OH (2) H2O : CH3CH2CH2CH2CH3 (3) H2O : H2O (4) H2O : CH3CH2OH (5) CH3CH2CH2CH2CH3 : H2O
6 11. What are the strongest types of intermolecular forces that must be overcome in order to: (a) evaporate benzene (C6H6) (b) boil chloroform (CHCl3) (c) boil liquid ammonia (NH3) (1) (a) dispersion (b) dipole-dipole (c) dipole-dipole (2) (a) dispersion (b) dipole-dipole (c) H-bonding (3) (a) dispersion (b) dispersion (c) dipole-dipole (4) (a) dipole-dipole (b) dispersion (c) H-bonding (5) (a) dispersion (b) dispersion (c) H-bonding 12. Suppose the vapor pressure of ethanol is 850 torr at 79.8 O C and 115 torr at 34.9 O C. Given this information, what is the temperature of the normal boiling point of ethanol? (1) 77 O C (2) 15 O C (3) 65 O C (4) 100 O C (5) 86 O C
7 13. Which answer choice lists the following compounds in order of increasing molecular polarity? I. CH4 II. CCl4 III. CH2F2 IV. CH2Cl2 V. CF2Cl2 (1) I = II < V < IV < III (2) I < IV < V < III < II (3) I < V < IV < III < II (4) I = II < IV < III < V (5) I = II < IV < V < III 14. Nickel crystallizes in a face-centered cubic structure with an edge length a = 352 pm. Based on this information, calculate the approximate density of nickel. (1) 7.75 g/cm 3 (2) 8.94 g/cm 3 (3) 8.03 g/cm 3 (4) 9.84 g/cm 3 (5) 10.6 g/cm 3
8 15. Which of the following substances exhibits hydrogen-bonding intermolecular forces in its liquid state? (1) CH3CH2CH2OH (2) CH3CH2OCH3 (3) CH3F (4) H2S (5) (CH3)3N 16. In molecular orbital treatment of diatomic molecules, what type of molecular orbital(s) are created by mixing an s orbital from one atom with a p orbital from the other atom? (1) only σ (2) only π (3) σ and π (4) σ and σ* (5) π and π*
9 17. A metal crystallizes in a face-centered cubic lattice. The radius of the atom is nm. The density of the element is 1.54 g/cm 3. What is this metal? (1) Fe (2) Ba (3) Ca (4) Cu (5) Na 18. In the picture, the atomic orbitals are drawn with their phases indicated. What type of molecular orbital is created by the combination of these two atomic orbitals? (1) σ (2) σ* (3) π (4) π* (5) δ
10 19. Which following sequence is correctly listed in order of increasing boiling point? (1) HF < F2 < Ar < SO2 (2) SO2 < HF < Ar < F2 (3) F2 < Ar < SO2 < HF (4) F2 < Ar < HF < SO2 (5) SO2 < Ar < F2 < HF 20. Which of the following aqueous solutions will have the highest freezing point? (1) 0.10 m KOH (2) 0.15 m CH3OH (3) 0.05 m BaCl2 (4) 0.05 m NH4NO3 (5) 0.10 m K2SO4
(1) M (2) M (3) M (4) M
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