CHEM 212 Practice questions-answers

CHEM 212 Practice questions-answers - CHEM 212/211 2009...

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CHEM 212/211 Assignment 1 - Answers September 24, 2009 Prof. Youla S. Tsantrizos 1 MULTIPLE CHOICE QUESTIONS: the correct answers are in bold and underlined 1. In quantum mechanics a node (nodal surface or plane) is: A) a place where Ψ is negative. B) a place where Ψ is positive. C) a place where Ψ = 0. D) a place where Ψ 2 is large. E) a place where Ψ 2 is negative. 2. When the 1 s orbitals of two hydrogen atoms combine to form a hydrogen molecule, how many molecular orbitals are formed? A) 1 B) 2 C) 3 D) 4 E) 5 3. The following electron configuration represents _______. 1s 2sp 3 2sp 3 2sp 3 2sp 3 A) the ground state of boron. B) the sp 3 hybridized state of carbon. C) the sp 3 hybridized state of nitrogen. D) the ground state of carbon. E) an excited state of carbon. 4. Identify the atomic orbitals in the C-C sigma bond in ethyne. A) (2sp 2 , 2sp 2 ) B) (2sp 3 , 2sp 3 ) C) (2sp, 2sp) D) (2p, 2p) E) (2sp, 1s)
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CHEM 212/211 Assignment 1 - Answers September 24, 2009 Prof. Youla S. Tsantrizos 2 5. Listed below are electron dot formulas for several simple molecules and ions. All valence electrons are shown; however, electrical charges have been omitted deliberately. H H H H H H I II III IV V H : Be : H H : B : H H : N : H H : N : H H : O : H . . . . . . . . . . . . . . . . Which of the structures actually bear(s) a positive charge? A) I B) II C) III D) III & V E) 6. What is the formal charge on oxygen in the following structure? O H 3 C CH 3 CH 3 . . A) +2 B) +1 C) 0 D) -1 E) -2
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Assignment 1 - Answers September 24, 2009 Prof. Youla S. Tsantrizos 3 7. In which structure(s) below does the oxygen have a formal charge of +1? O C H H O H O H H H O H 3 C CH 3 CH 3 II III IV I . . . . . . . . : . . H A) I only B) II only C) I and III D) I and IV E) I, III, and IV 8. Which structure(s) contain(s) an oxygen that bears a formal charge of +1? O H 3 C CH 3 CH 3 IV O H 3 C H H III O C O II O C H O I O C O O V . . . . . . : : . . . . . . : : : . . . . : : : . . : : A) I and II
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CHEM 212 Practice questions-answers - CHEM 212/211 2009...

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