Practice8ans

Practice8ans - 1. Sodium losing an electron is an _...

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1. Sodium losing an electron is an ________ process, and fluorine losing an electron is an _______ process. a. endothermic, exothermic b. exothermic, endothermic c. endothermic, endothermic d. exothermic, exothermic e. More information is needed. 2. In which pair do both compounds exhibit predominantly ionic bonding? a. PCl 5 and HF b. Na 2 SO 4 and BF 3 c. KF and O 3 d. KF and H 2 O e. KCl and CaO 3. The statement that the first ionization energy for an oxygen atom is lower than the first ionization energy for a nitrogen atom is a. consistent with the general trend relating changes in ionization energy across a period from left to right, because it is easier to take an electron from an oxygen atom than from a nitrogen atom. b. consistent with the general trend relating changes in ionization energy across a period from left to right, because it is harder to take an electron from an oxygen atom than from a nitrogen atom. c. inconsistent with the general trend relating changes in ionization energy across a period from left to right and due to the fact that the oxygen atom has two doubly occupied 2p orbitals and nitrogen has only one. d. inconsistent with the general trend relating changes in ionization energy across a period from left to right and due to the fact that oxygen has one doubly occupied 2p orbital and nitrogen does not.
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e. incorrect. 4. The electronic configuration for the ground state of CN is? a. σ 2s 2 σ∗ 2s 2 π 2p 4 σ 2p 2 b. σ 2s 2 σ∗ 2s 2 π 2p 4 σ 2p 1 c. σ 2s 2 σ∗ 2s 2 σ 2p 2 π 2p 3 d. σ 2s 2 σ∗ 2s 2 π 2p 4 π∗ 2p 1 e. none of these 5. Which of the following molecules exhibit(s) resonance? a. CH 3 OH b. HCO 2 c. H 2 NNH 2 d. Both a and b e. Both a and c 6. Which of the following bonds is the least polar? a. H—F b. H—N c. H—O d. H—C e. All are the same
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B A Internuclear Distance Potential Energy To answer questions 7. and 8., refer to the following plots of Potential Energy vs. Internuclear Distance. 7. Which of the following must be true regarding the potential energy curves above? a. The molecule represented by curve A has a longer equilibrium bond length than the molecule represented by curve B . b. The potential energy increases as the internuclear distance approaches zero partly because of the Coulombic attraction between the electrons. c. The molecules represented by curves A and B must contain covalent bonds because the curves have minima. d. All of a., b., and c. e. None of these. 8. Which of the following must be true regarding the potential energy curves above? a. The minimum potential energy for the molecule represented by curve A is larger in
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This note was uploaded on 11/03/2009 for the course CHEM 1403 taught by Professor Leornardfine during the Fall '07 term at Columbia.

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Practice8ans - 1. Sodium losing an electron is an _...

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