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[Exam Tutorial] CHM139 Term Test 1 Winter 2012 Questions

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Multiple Choice Questions 1. Potassium dichromate, K Cr O , is used in tanning leather, decorating porcelain, and water 2 2 7 proofing fabrics. Calculate the number of chromium atoms in 78.82 g of K Cr O . 2 2 7 25 a) 9.490 x 10 Cr atoms 24 b) 2.248 x 10 Cr atoms 24 c) 1.124 x 10 Cr atoms d) 3.227 x 10 Cr atoms e) 1.613 x 10 Cr atoms 2. Atomic orbitals developed using quantum mechanics: a) Describe regions of space in which one is most likely to find an electron. b) Describe exact paths for electron motion. c) Give a description of the atomic structure which is essentially the same as the Bohr model. d) Allow scientists to calculate an exact volume for the hydrogen atom. e) Are in conflict with the Heisenberg Uncertainty Principle. -19 3. In the photoelectric effect, a photon with an energy of 5.3 x 10 J strikes an electron in a metal. Of this energy, 3.6 x 10 -19J is the minimum energy required for the electron to escape from the metal. The remaining energy appears as kinetic energy of the photoelectron. What is the velocity of the photoelectron, assuming it was initially at rest? 14 a) 3.7 x 10 m/s 11 b) 3.7 x 10 m/s c) 1.9 x 10 m/s d) 6.1 x 10 m/s -19 e) 1.7 x 10 m/s 4. Which of the following is a correct set of quantum numbers for an electron in a 5f orbital? a) n = 5, l = 3, m = +1 l b) n = 5, l = 2, m =l+3 c) n = 4, l = 3, ml= 0 d) n = 4, l = 2, m =l+1 e) n = 5, l = 4, m =l3 5. What is the correct order of decreasing size of the following ions? 3- - + 2+ a) P > Cl > K > Ca 2+ + - 3- b) Ca > K > Cl > P + - 2+ 3- c) K > Cl > Ca > P + - 3- 2+ d) K > Cl > P > Ca e) None of the above is correct. 6. At very high pressures (~ 1000 atm), the measured pressure exerted by real gases is greater than that predicted by the ideal gas equation. This is mainly because a) Such high pressures cannot be accurately measured. b) Real gases will condense to form liquids at 1000 atm pressure. c) Gas phase collisions prevent molecules from colliding with the walls of the container. d) Of attractive intermolecular forces between gas molecules. e) The volume occupied by the gas molecules themselves becomes significant. 7. Octane has a vapor pressure of 40. Torr at 45.1° C and 400. What is its heat of vaporization? a) 39.9 kJ/mol b) 46.0 kJ/mol c) 590 kJ/mol d) 710 kJ/mol e) None of the above 8. Select the pair of substances, assumed to be in their liquid phase, in
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