An ionic bond is formed between a cation A+ and an anion B− . How would the energy of the ionic bond [see Equation (9.2) of your textbook] be affected by the following changes? (a) doubling the radius of A+ , (b) tripling the charge on A+ , (c) doubling the charges on A+ and B− , (d) decreasing the radii of A+ and B− to half their original values.

Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter8: Thermochemistry
Section: Chapter Questions
Problem 12QAP: The heat of neutralization, Hneut, can be defined as the amount of heat released (or absorbed), q,...
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An ionic bond is formed between a cation A+
and an anion B−
. How would the energy of the
ionic bond [see Equation (9.2) of your textbook] be affected by the following changes?
(a) doubling the radius of A+
,
(b) tripling the charge on A+
,
(c) doubling the charges on A+
and B−
,
(d) decreasing the radii of A+
and B−
to half their original values.
[1 point each = 4 points]



 

y proportional to the product of their charges and inversely proportional to the
re of separation between them. For a single Lit ion and a single F ion separated
nance r, the potential energy of the system is given by
QLiQF
Because en
Coulomb's
Qi QF
= k
where F is
(9.2)
Qut and Q- are the charges on the Lit and F ions and k is the proportionality con-
Because Qut is positive and QF is negative, E is a negative quantity, and the forma-
an ionic bond from Lit and F is an exothermic process. Consequently, energy must
oplied to reverse the process (in other words, the lattice energy of LiF is positive), and
Stur
Stur
struggle
lonic bo
eBook
Resourc
table than separate Li* and F ions.
Transcribed Image Text:y proportional to the product of their charges and inversely proportional to the re of separation between them. For a single Lit ion and a single F ion separated nance r, the potential energy of the system is given by QLiQF Because en Coulomb's Qi QF = k where F is (9.2) Qut and Q- are the charges on the Lit and F ions and k is the proportionality con- Because Qut is positive and QF is negative, E is a negative quantity, and the forma- an ionic bond from Lit and F is an exothermic process. Consequently, energy must oplied to reverse the process (in other words, the lattice energy of LiF is positive), and Stur Stur struggle lonic bo eBook Resourc table than separate Li* and F ions.
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