Quiz 4

NAME: _________________________________Form 2 (yellow)November 26, 2001 QUIZ #4 CHEM 1011) The cyanate ion NCO - , has the least electronegative atom carbon in the center. The veryunstable fulminate ion, CNO - , has the nitrogen in the center.a) Draw three resonance Lewis dot structures for each ion and assign formal charge to eachatom. (Use back if necessary)b) On the basis of formal charge and electronegativity circle the resonance structure which isthe most reasonable.2) Some new elements have been discovered in my laboratory so I am naming them after one ofmy favorite singers. Here are the names and some properties of the elements:New Element Number of valence electrons Element always obeysoctet ruleEl = Elvisium 4 YesAn = Aaronium 5 NoPy = Presleyium 7 YesWe have also discovered some new molecules. It is your job to determine the Lewis dotstructures and geometric structures of these new molecules using the information in the table.a) ElPy 4b) AnPy 3Hybridization around central atom: ________Shape:__________________Hybridization around central atom: ________c) [AnPy 4 ] -Shape:__________________Hybridization around central atom: ________ Shape:__________________3) Given the bond energy data on the board, calculate the ∆H o rxn for the following reaction.CH 4 (g) + 2H 2 O(g) ! CO 2 (g) + 4H 2 (g)