High School
SAT
ACT
University
MCAT
LSAT
DAT

Ionic Bonding and Lattice Energy

Related Topics

Wize University Chemistry Textbook > Chemical Bonding

Lattice Energy of Ionic Bonds

5 Activities

checklist
Mark Yourself Question
  1. Grab a piece of paper and try this problem yourself.
  2. When you're done, check the "I have answered this question" box below.
  3. View the solution and report whether you got it right or wrong.

Ionic Bonding and Lattice Energy


Ionic Compounds
  • Formed between oppositely charged species (cations and anions) and held together by electrostatic attraction

  • Electrons are not shared

  • An ionic bond is expected if the difference in electronegativity is greater than 1.6, Δχ1.61.6, \ \Delta \chi 1.6

Lattice Energy
  • The energy required to separate one mole of an ionic substance into its constituent ions measured in kJ/mol.
LiF(s)→ Li(g)+ +F(g)−ΔE=Lattice Energy\text{LiF}_{(s)}\rightarrow \ \text{Li}^{+}_{(g)}\ +F^-_{(g)} \quad \Delta E=\text{Lattice Energy}

  • more lattice energy=
    stronger
    (stronger/weaker) ionic compound
  • For a metal salt Mn+Xm- with interatomic distance M-X

E∝q(+)q(−)r=(+n)(−m)dM−XE\propto\frac{q^{(+)}q^{(-)}}{r}=\frac{(+n)(-m)}{d_{M-X}}

Note that:dM−X=rM+rXd_{M-X}=r_M+r_X

  • As the magnitude of the charge increases the lattice energy increases.
LiF < MgF2 < MgO
  • As the elements increase in size the lattice energy decreases.
LiF > NaF > KF > KCl > KBr

More Lattice Energy of Ionic Bonds Questions:
Lattice energy
Select the correct order in terms of decreasing lattice energy for the following compounds:
NaBr, GaP, LiCl, NaI, LiF and CaO.
Highest melting point
Ionic Bonds
For each of the following pairs of ionic compounds, determine which will have the stronger ionic bonds.
Intermolecular forces: Ionic Bond Strength
Consider two compounds: CaS and NaCl. Which ionic compound would have a larger Coulomb Energy released upon forming their respective ionic compounds. Why?
Lattice Energy: Strength
Which of the following has the highest lattice energy?
Highest melting point
Lattice Energy Example 2
Does KCl or MgO have the larger lattice energy?
Lattice Energy Example 1
Does KCl or KBr have the larger lattice energy?
KCl→\rightarrow K+ and Cl KBr → K+ and Br-
Intermolecular forces: Lattice energy
Which of the following has the lowest lattice energy?
"The Periodic Table", image retrieved from Chemistry 2e (https://d3bxy9euw4e147.cloudfront.net/oscms-prodcms/media/documents/Chemistry2e-OP_QCzV58S.pdf) by Flowers, P et al., is licensed under CC BY.
Lattice Energy Example 2
Does KCl or MgO have the larger lattice energy?
"The Periodic Table", image retrieved from Chemistry 2e (https://d3bxy9euw4e147.cloudfront.net/oscms-prodcms/media/documents/Chemistry2e-OP_QCzV58S.pdf) by Flowers, P et al., is licensed under CC BY.
Lattice Energy: Strength
Which of the following ionic solids has the highest lattice energy?
BeO CaSe MgS
"The Periodic Table", image retrieved from Chemistry 2e (https://d3bxy9euw4e147.cloudfront.net/oscms-prodcms/media/documents/Chemistry2e-OP_QCzV58S.pdf) by Flowers, P et al., is licensed under CC BY.
Does KCl or KBr have the larger lattice energy?
"The Periodic Table", image retrieved from Chemistry 2e (https://d3bxy9euw4e147.cloudfront.net/oscms-prodcms/media/documents/Chemistry2e-OP_QCzV58S.pdf) by Flowers, P et al., is licensed under CC BY.
Lattice Energy: Strength
Rank the following in order of increasing lattice energy
LiF, LiCl, Li2S
Intermolecular Forces: Lattice Energy
Which of the following compounds has the largest lattice energy?
Lattice Energy Practice Problem
Rank the following compounds in order of increasing lattice energy, RbCl, CaI2, BaSe.
Lattice Energy: Strength
Which of the following compounds has the highest lattice energy
Lattice Energy: Strength
Rank the following compounds in order of increasing lattice energy:
LiF, LiCl, Li2S
Lattice Energy: Strength
Choose the option below which has the compound with the largest lattice energy listed first
Intermolecular bonds: Highest Lattice Energy
Choose the option below with the highest lattice energy.
Lattice Energy
Which of these three species has the highest lattice energy?
MgO
NaCl
Intermolecular forces: Ionic Bonds
Which of these three species has the lowest lattice energy?
LiF
CaCl
Lattice Energy: Strength
Which of the following relationships is/are CORRECT when comparing lattice energies?
i. CaF2>BaF2i.\ CaF_2>BaF_2
ii. CsBr>RbBr>NaClii.\ CsBr>RbBr>NaCl
Lattice Energy: Strength
Which of these ionic compounds has the highest lattice energy?
Lattice Energy: Strength
Which of the following ionic compounds has the lowest lattice energy?
BaCl2
NaCl