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[Exam Tutorial] CHM139 Term Test 1 Winter 2011 Questions

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Department
Chemistry
Course
CHM135H1
Professor
All Professors
Semester
Winter

Description
CHM139 Term Test 1 February 9, 2011 1. An element X consists of three isotopes as shown below. What is the relative atomic mass of this element? Abundance Mass (amu) Isotope 1 30.00% 40.00 Isotope 2 50.00% 41.00 Isotope 3 20.00% 42.00 a) 40.70 amu b) 40.90 amu c) 41.45 amu d) 41.90 amu e) 42.20 amu 2. The mass percentage of nitrogen in the amino acid glutamine (C H N O ) is: 5 10 2 3 a) 15.4% b) 19.2% c) 21.8% d) 23.0% e) 26.8% 3. 15.0 mL of 0.100 M hydrochloric acid (HCl) is added to pure water to yield a final volume of 250.0 mL. The resulting concentration of hydrochloric acid is: -3 a) 1.00 x 10 M b) 2.50 x 10 M3 -3 c) 3.32 x 10 M d) 4.67 x 10 M3 -3 e) 6.00 x 10 M 11 4. Carbon monoxide absorbs light of frequency 1.16 x 10 Hz, resulting in excitation of an electron within the molecule. The corresponding change in electron energy in kJ/mol is: a) 0.0769 kJ/mol b) 0.0463 kJ/mol c) 0.926 kJ/mol d) 4.63 kJ/mol e) 13.9 kJ/mol 5. Cesium metal has an ionization energy of 3.894 eV and a binding energy of 206.5 kJ/mol. Would a laser operating at a wavelength of 488.1 nm be able to eject a photoelectron from a sample of cesium metal? a) Yes, because the photon energy is greater than the ionization energy. b) No, because the photon energy is smaller than the ionization energy. c) Yes, because the photon energy is greater than the binding energy. d) No, because the photon energy is smaller than the binding energy. 6. Which of the following sets of quantum numbers are not allowed? n l m l m s I 3 -1 -1 +½ II 3 1 -1 -½ III 3 1 2 +½ IV 3 2 2 +½ a) I and III only b) III only c) III and IV only d) I and II only e) II and IV only 7. When ranked from left to right by increasing first ionization energy, the correct order for the elements Ca, Ge, Ni, and Se is: a) Ge < Ca < Ni < Se b) Se < Ge < Ni < Ca c) Ni < Ge < Ca < Se d) Ca < Ni < Ge < Se e) Ca < Ge < Se < Ni 8. Consider a simple diatomic molecule. When the distance between the nuclei of the two atoms is equal to the covalent bond length, it is true that: a) The repulsive forces are greater than the attractive forces holding the atoms together b) The attractive forces holding the atoms together are greater than the repulsive forces c) The potential energy due to attractive and repulsive forces is at a minimum d) The potential energy due to attractive and repulsive forces is at a maximum e) The potential ene
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