PracticeExam2a

PracticeExam2a - Tufts University Chem 1 Summer 2008...

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Tufts University Chem 1 Summer 2008 Practice Exam 2a I. Multiple Choice Questions A Only one answer is assumed correct in each question. 1. All of the following are state functions except A) q B) T C) U D) H 2. Which of the following is a correct statement of the First Law of Thermodynamics? A) The internal energy of a system that does not exchange energy with the surroundings is constant. B) The internal energy of a system can be changed only by heat transfer and work and Δ E = w + q C) The internal energy of the Universe is constant D) All of the above E) None of the above 3. Which of the following chemical equations is used to define the standard enthalpy of formation of ammonium perchlorate? A) ½N 2 (g) + ½Cl 2 (g) + 2O 2 (g) + 2H 2 (g) NH 4 ClO 4 (s) B) N 2 (g) + Cl 2 (g) + 4O 2 (g) + 4H 2 (g) 2NH 4 ClO 4 (s) C) NH 3 (g) + HClO 4 (l) NH 4 ClO 4 (s) D) All of the above E) None of the above 4. Which of the following describe a standard state at 25 o C? A) Hydrogen gas (H 2 ) at a pressure of 1 atm B) Pure liquid water C) 1 M HClO 4 (aq) D) All of the above E) None of the above 5. Which of the following experiments most directly supports de Broglie's hypothesis of the wave nature of matter? A) blackbody radiation B) the photoelectric effect C) alpha-particle scattering by a metal foil D) electron diffraction by a crystal E) the emission spectrum of the hydrogen atom
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6. Estimate the wavelength of the wave below. A) 3 nm B) 0.5 nm C) 1 nm D) 1.5 nm E) 2 nm 7. How many nodes are present in a 3s and a 3d orbital, respectively? A) 2 and 2 B) 3 and 3 C) 0 and 2 D) 1 and 1 E) 2 and 3 8. The total number of orbitals in a shell with principal quantum number 4 is A) 32. B) 50. C) 4. D) 40. E) 16. 9. Which of the following has the smallest atomic radius? A) Cl B) P C) S D) Si E) Al 10. Arrange the following types of photons of electromagnetic radiation in order of decreasing energy: red light, radio, x-rays, γ -rays, infrared. A)
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PracticeExam2a - Tufts University Chem 1 Summer 2008...

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