Question

Describe each bond by stating whether it is a sigma or pi bond and the orbitals...

Describe each bond by stating whether it is a sigma or pi bond and the orbitals that overlap to give the bond

Decide whether the following is a Polar Specie or Not?

a) H2

b) HCl

c) H20

d) BCl3

e) NH3

f) NH4+

g) HSO4

h) HSO3-

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Homework Answers

Answer #1

a) H2: The 2 H-atoms are bonded via a sigma bond formed by overlap of two 1s orbitals on the 2 H-atoms. Since both the atoms involved in the sigma bond are of the same electronegativity (same atoms infact), the molecule is not polar.

b) HCl: There is a sigma bond between the H-atom and the Cl-atom. The sigma bond is formed by the overlap of 1s orbital on H and 2pz orbital on Cl (assume that z-axis is the bonding axis). The 2px and 2py orbitals on Cl are parallel to the bonding axis and house the lone pair of electrons. Since the sigma bond involves atoms with disparate electronegativity values (Cl is more electronegative than H), the bond is polar.

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