Scelta multipla
The energy for the following reaction was measured to be -977.2 kJ/mol: Ba(g) + O(g) → BaO(s). Using this fact and data in the table below, calculate the lattice energy (in kJ/mol) for BaO(s).
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11. Bonding & Molecular Structure
Lattice Energy
Scelta multipla
Why do ionic compounds generally have high melting points?
A
Because ionic compounds are composed of large molecules with weak intermolecular forces.
B
Because ionic compounds contain covalent bonds that require a lot of energy to break.
C
Because strong electrostatic forces (lattice energy) hold the ions together in a rigid structure.
D
Because the ions in ionic compounds are free to move, making them easy to melt.
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Understand that ionic compounds are made up of positively and negatively charged ions arranged in a repeating three-dimensional lattice structure.
Recognize that the forces holding these ions together are strong electrostatic attractions between oppositely charged ions, often called ionic bonds or lattice energy.
Recall that lattice energy is the energy required to separate one mole of an ionic solid into its gaseous ions, and it is typically very high due to the strong attractions.
Know that to melt an ionic compound, enough energy must be supplied to overcome these strong electrostatic forces and allow the ions to move freely.
Conclude that because of these strong ionic interactions, ionic compounds generally have high melting points, unlike substances held together by weaker intermolecular forces.
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