Practice Exam

Practice Exam - Sample Questions Final Fall 2010 1...

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Sample Questions Final Fall 2010 1. Calculate the frequency of visible light having a wavelength of 486.1 nm. A. 2.06 × 10 14 /s B. 2.06 × 10 6 C. 6.17 × 10 D. 1.20 × 10 –15 E. 4.86 × 10 –7 2. A beam of neutrons (mneutron = 1.6749 x 10 -24 g) has a velocity of 1.44 km/hour. What is the wavelength of the neutron wave? A. 993 nm B. 2.76 x 10 -10 m C. 2.76 x 10 -13 m D. 9.93 x 10 m E. 276 nm 3. When light of a wavelength of 125 nm strikes a certain metal, electrons having a velocity of 8.2 x 10 5 m/s are emitted from the surface of the metal. What is the threshold frequency of the metal? A. 1.9 x 10 15 s -1 B. 3.1 x 10-19 s C. 2.4 x 10 15 s D. 1.3 x 10 18 s E. None of the listed answers. 4. What are the possible values for the orbital angular momentum quantum number l given the following values for the other three quantum numbers: n = 4, l = ?, ml = 0, ms = +1/2 A. 0 B. 1, 2, 3, or 4 C. 3 D. 0, 1, 2, or 3 E. none of these answers Page 1
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Sample Questions Final Fall 2010 5. If the wavelength of an electron is equal to the radius of the n=2 orbit in He + , what must the velocity of the electron be? A. 6.88 x 10 6 m/s B. 1.38 x 10 7 C. 3.44 x 10 6 D. 5.47 x 10 5 E. The velocity cannot have an exact value 6. Davisson and Germer (as well as G. P. Thompson) conducted a famous and important experiment. Which of the following statements is TRUE concerning their experiment? A. They observed diffraction patterns from photons confirming that light had wave properties B. They observed diffraction patterns of electrons confirming that matter had wave properties C. Their experiment contradicted DeBroglie’s equation D. They observed standing wave patterns from electrons confirming the existence of orbitals E. None of the other four statements is true 7. Which of the following statements is/are TRUE ? A. The wavefunction, ψ , is a solution to the Schrodinger equation B. The square of the wavefunction, ψ 2 , is the total probability of finding the electron in a spherical shell at distance r from the nucleus C. Orbitals with the same n cannot overlap in space D. For the same orbital type (i.e. same l quantum number), orbitals with the higher n value will have a more negative energy E. two of the other four statements are true 8. The successive ionization energies for an unknown element are I 1 =896 kJ/mol, I 2 =1752 kJ/mol, I 3 =14,807 kJ/mol, I4=17,948 kJ/mol. To which group of the periodic table would you predict the element to belong?
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This note was uploaded on 12/16/2010 for the course CHEM 110 taught by Professor Fenster during the Fall '07 term at McGill.

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Practice Exam - Sample Questions Final Fall 2010 1...

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