CHEM 120 Final Exam 5 GRADED A+ (ACTUAL EXAM ) Questions and Answers (Solved)

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1. How many bonds can nitrogen have? Which rule or principle should beused? A) Five bonds; octet rule. B) Three bonds; octet rule. C) Three bonds; the Hund's rule. D) Five bonds; the Aufbau Princi... ple. Answer: B 2. When two hydrogen atoms meet, they will attract to each other and form abond (and a H2 molecule).Why? A) Because electrons like to stay together. B) Because electrons like to be paired up. C) Because there is attraction between the electron in one hydrogen atom andthe nucleus of another hydrogen atom. D) Gravitational attraction between two atoms binds two hydrogen atoms (orany two atoms) together into a molecule. Answer: C 3. How do you determine the number of electron domains on the central atom? A) Draw Lewis structure of the compound, then add up the numbers of loneelectron pair, single bond, double bond, and triple bond. B) The # of electron domains = the # of valence electrons C)The # of electron domains = the number of atomsthe central atom is bondedto. D) The # of electron domains = the # of valence electrons divided by 2 Answer: A 4. Indicate partial charges on each atom of the following two bonds: C-Br andO-N. A) Carbon has partial negative charge and bromine has partial positivecharge; both oxygen and nitrogen have no charge. B) Carbon has partial positive charge and bromine has partial negative charge; oxygen has partial negative charge and nitrogen has partial positivecharge. C) Carbon has partial negative charge and bromine has partial positive charge; oxygen has partial positive charge and nitrogen has partial negativecharge. D) Carbon has partial positive charge and bromine has partial negative charge; oxygen has partial positive charge and nitrogen has partial negativecharge. Answer: B [Show More]

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