Department of Chemistry

CARNEGIE MELLON UNIVERSITY

09-105 Introduction to Modern Chemistry

Quiz #4 Name

Closed book, 10 minutes September 29, 1998

 

H                                 2He
Li Be                     B C N O F 10Ne
Na Mg                     Al Si P S Cl 18Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br 36Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I 54Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At 86Rn
Fr Ra Ac* Rf Ha Sg Ns Hs Mt 110 111 112            

In each of the following cases, is the figure a complete, preferred Lewis structure as defined in this course? Just answer yes or no.

(I3)- is No. (The structure shown is for I3 and has one electron too few.)

Ozone, O3 is No. (The structure shown is for one of two contributing resonance structures. The other must be shown as well.)

Nitric oxide, NO, is Yes.

Acetic acid, CH3C(O)OH is No. (These are not equivalent resonance structures. Regardless of what acetic acid's Lewis structure is, the two structures shown have moved a hydrogen atom to a different location.)

Arsenic oxychloride, with As central, is No. (The formal charges can be made to vanish if As is given its allowed expanded octet.)