131_e2_f08 - fCHE 131 Fall 2008, Exam 2 Multiple Choice, 4...

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fCHE 131 Fall 2008, Exam 2 Multiple Choice, 4 points each On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. Which of the following molecules does not have a dipole moment? A. IF 5 B. BF 3 C. NF 3 D. SF 4 E. PCl 3 ____ 2. Which, if any, of the following statements is incorrect ? If all are correct, choose that statement. A. The ionization energy of oxygen is lower than the ionization energy of nitrogen, because oxygen is the first element with two spin-paired p electrons in the same orbital, a situation that adds to the stability of the atom. B. The energy of electron attachment (electron affinity as defined in our textbook) is less negative for fluorine than for chlorine, because electron attachment to the small fluorine atom causes a lot of electron-electron repulsion. C. All of the statements are correct. D. Electronegativity is not a fundamental property of an atom that can be determined experimentally, but rather a qualitative measure that compares the relative ability of atoms to attract electrons in a chemical bond. E. The ionization energy is larger for helium than for hydrogen, because helium has a higher effective nuclear charge. ____ 3. The molecular orbital energy level diagram for diatomic molecules and ions shown below does not show the orbital symbols. Which of the following statements about this energy level diagram is incorrect ?
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A. The diagram features four orbitals of σ or σ * character. B. The four orbitals at lowest energy are all bonding in character. C. The diagram features four orbitals of π or π * character. D. The diagram features two orbitals of σ or σ * character that originate from atomic p orbitals. E. The diagram features only one orbital with σ character that originates from atomic s orbitals. ____ 4. Which one of the following statements is incorrect ? If all are correct, choose that statement. A. A sample consisting of atoms with unpaired electrons is ferromagnetic, if all the magnetic moments are permanently oriented in the same direction. B. A paramagnetic sample does not create its own (macroscopic) magnetic field but is attracted by an outside magnetic field. C. An atom with an unpaired electron has a magnetic moment. D. A sample consisting of atoms with unpaired electrons is diamagnetic, if the magnetic moments are randomly oriented. E. All statements are correct. ____ 5. Which one of the following statements about the four structures is incorrect ? CC Cl H C Cl H H H Cl Cl C H H H H H Cl C Cl H H H H H C Cl H H Cl I II III IV A. Structure IV can have a constitutional isomer.
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This note was uploaded on 03/05/2010 for the course CHE 131 taught by Professor Kerber during the Fall '08 term at SUNY Stony Brook.

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131_e2_f08 - fCHE 131 Fall 2008, Exam 2 Multiple Choice, 4...

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