Problem 10: The potassium bromide (KBr) molecule has an electric dipole moment of 3.50 × 10...
Problem 10: The potassium bromide (KBr) molecule has an electric
dipole moment of 3.50 × 10
-29
C⋅m. The molecule has a dipole moment because the lone 4s electron
of the potassium atom spends much of its time orbiting the bromine
nucleus (and thereby filling the 4p shell of bromine) – leaving the
potassium atom positively charged and the bromine atom negatively
charged (this is called “ionic bonding”).
(a) Assuming for the moment that the potassium 4s electron spends
all of its time orbiting the bromine nucleus, use the known dipole
moment to calculate the physical separation between the potassium
and bromine nuclei in the molecule.
(b) The actual separation between the potassium and bromine nuclei
is 0.282 nm (2.82 × 10 -10 m). Use this value to describe the
nature of the ionic bond between the atoms – what are the effective
charges of the potassium and bromine atoms in the molecule, and how
do these compare with the assumption made in (a)?
Homework Answers
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Problem 10: The potassium bromide (KBr) molecule has an electric
dipole moment of 3.50 × 10...
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