(1) A diatomic molecule is made up of the nonradioactive atoms X and Y.
(a) Identify X and Y if the electronegativities of X and Y are respectively, the lowerbound and upperbound of the range containing the electronegativities of all nonradioactive elements.
(b) Is this diatomic molecule polar or nonpolar?
(2) Given that the diatomic molecule HF (hydrogen fluoride) has a bond length of 0.92Å; 1.96 electronegativity difference and dipole moment of 1.82 Debyes:
(a) Calculate the effective charges on the H and F atoms of the HF molecule in units of the electronic charge, e.
(b) Consider this sequence of Hydrogen Halides: HF, HCl, HBr, HI. As we proceed from HF to HI the bond lengths are increasing while the dipole moments are decreasing. Why?
(3) The three isomers of Dichloroethylene are as follows:
An experiment shows that a pure sample of one of these isomers has a dipole moment of zero. Determine which of the isomers in figure 9.37 was measured.