1 The cyanate ion NCO has the least electronegative atom carbon in the center The very has the nitrogen in the center a Draw three resonance Lewis dot structures for each ion and assign ID: 504662
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NAME: _________________________________ Form 2 (yellow) November 26, 2001 QUIZ #4 CHEM 101 1) The cyanate ion NCO, has the least electronegative atom carbon in the center. The very , has the nitrogen in the center. a) Draw three resonance Lewis dot structures for each ion and assign formal charge to each atom. (Use back if necessary). cyanate: N C O .... N C O .... - N C O .... fulminate: C N O .... C N O .... - C N O .... +1-b) On the basis of formal charge and electronegativity circle the resonance structure which 2) Some new elements have been discovered in my laboratory so I am naming them after myself. Here are the names and some properties of the elements: New ElementNumber of valence electrons Rt = Robertium 4 Yes Mc = McCreadyium 6 No Bn = Bowmanium 7 Yes We have also discovered some new molecules. It is your job to determine the Lewis dot structures and geometric structures of these new molecules using the information in the table. a) RtBn __ Shape: tetrahedral b) McBn Hybridization around central atom: __sp 3___ Shape: bent c) McBn Hybridization around central atom: __dsp 3__ Shape: sawhorse 3) Given the bond energy data on the board, calculate the for the following reaction. RtBn SN = 4LP = 0 BnBn ................ SN = 5LP = 1 McBn ....SN = 4LP = 2 NAME: _________________________________ Form 2 (yellow) November 26, 2001 QUIZ #4 CHEM 101 1) The cyanate ion NCO, has the least electronegative atom carbon in the center. The very , has the nitrogen in the center. a) Draw three resonance Lewis dot structures for each ion and assign formal charge to each atom. (Use back if necessary) cyanate: N C O .... N C O .... - N C O .... fulminate: C N O .... C N O .... +1- - C N O .... +1-b) On the basis of formal charge and electronegativity circle 2) Some new elements have been discovered in my laboratory so I am naming them after one of my favorite singers. Here are the names and some properties of the elements: New ElementNumber of valence electrons Element always obeys El = Elvisium 4 Yes An = Aaronium 5 No Py = Presleyium 7 Yes We have also discovered some new molecules. It is your job to determine the Lewis dot structures and geometric structures of these new molecules using the information in the table. a) ElPyHybridization around central atom: __sp __ Shape: tetrahedral b) AnPy Hybridization around central atom: __sp __Shape: trigonal pyramidal c) [AnPyHybridization around central atom: __dsp 3__ Shape: sawhorse 3) Given the bond energy data on the board, calculate the for the following reaction. (g) + 2HO(g) (g) + 4H(g) = 4(D of C-H) + 4(D of O-H) 2(D of C=O) - 4(D of H-H) = 4(413 kJ) + 4(467 kJ) - 2(799 kJ) - 4(432 kJ) = ElPy Py SN = 4LP = 0 .... AnBn Bn SN = 4LP = 1 PyPy ................ SN = 5LP = 1