CHEM 212 Practice questions

CHEM 212 Practice questions - CHEM 212/211 Prof Youla S...

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CHEM 212/211 Assignment 1 September 24, 2009 Prof. Youla S. Tsantrizos 1 MULTIPLE CHOICE QUESTIONS 1. In quantum mechanics a node (nodal surface or plane) is: A) a place where is negative. B) a place where is positive. C) a place where = 0. D) a place where 2 is large. E) a place where 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 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. HH H H H H I II III IV V H : Be : H H : B : : N : : N : : O : H .. Which of the structures actually bear(s) a positive charge? A) I B) II C) III D) III & V E) IV & V 6. What is the formal charge on oxygen in the following structure? O H 3 CC H 3 CH 3 A) +2 B) +1 C) 0 D) -1 E) -2
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CHEM 212/211 Assignment 1 September 24, 2009 Prof. Youla S. Tsantrizos 3 7. In which structure(s) below does the oxygen have a formal charge of +1? O CH H O H O HH H O H 3 CC H 3 CH 3 II III IV I .. : H s 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 H 3 CH 3 IV O H 3 H III O C O II O C H O I O C O O V : : : : : : : : : : A) I and II B) III and IV C) V D) II E) I and V
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CHEM 212/211 Assignment 1 September 24, 2009 Prof. Youla S. Tsantrizos 4 9. Which of the following molecules or ions has a nitrogen with a formal charge of -1?
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This note was uploaded on 10/16/2009 for the course CHEM CHEM212 taught by Professor T during the Fall '09 term at McGill.

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CHEM 212 Practice questions - CHEM 212/211 Prof Youla S...

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