Which of the following using either the polar arrow or partial charges (δ+ & δ-) correctly represents the polarity of the Te⎯Se bond in TeSe3? (choose the correct letter from A – D)   f)   TeSe3 is a  (choose either polar or nonpolar) molecule because (choose correct letter from A – E)   A.  its’ bond dipole moments reinforce each other to give a non-zero net dipole moment. B.  it is a symmetrical molecule with a non-zero net dipole moment pointing toward S in the molecule. C.  its’ bond dipole moments reinforce each other to give a net dipole moment equal to zero. D.  it is an unsymmetrical molecule whose dipole moments cancel out each other to give a zero net dipole moment. E.  it is a symmetrical molecule whose dipole moments cancel out each other to give a zero net dipole moment.

2. Answer parts a-e using the skeletal structure of the molecule shown below. NE # NC=N; + NÁ a. Add all implied hydrogen atoms to the skeletal structure. b. How many tetrahedral carbons are in the molecule? What hybridization do tetrahedral carbon atoms have? c. Consider the bond marked by *. Based on what you know about electronegativity trends, which atom in the bond is more electron rich? Draw a dipole arrow pointing toward the more electron rich atom. d. Label each N atom with its hybridization (sp, sp², or sp³). Based on the hybridization that you assigned, what atomic orbitals does each N atom possess? (Hint: Each atom should always have 4 atomic orbitals.) NA atomic orbitals NB atomic orbitals Ne atomic orbitals ND atomic orbitals e. Consider the lone pair on each nitrogen atoms. What atomic or hybridized atomic orbital holds each lone pair (sp, sp², sp³, s, or p)? Lone pair on N₁ held by Lone pair on NB held by Lone pair on ND held by

Is the molecule below polar? Reminder: black = C; red = 0; white = H; blue = N; yellow = S Yes, because the electronegative elements (in color) result in polar bonds with carbon (black) & because those polar bonds are not symmetrically distributed so as to cancel out all dipole moments Yes, because is it symmetric Yes, because the electronegative elements (in color) result in polar bonds with carbon (black) No, because it has no polar bonds O No, because the polar bonds are symmetrically distributed resulting in the dipole moments canceling out

Decide wnether each row is a set of resonance structures for a single molecule and select "yes" or "no" in the last column. structures resonance structures? O yes O no O yes O no O yes O no O yes O no