Multiple Choice
The lattice energy of CaF_2 is the energy change associated with which of the following processes?
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11. Bonding & Molecular Structure
Lattice Energy
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The lattice energy for ionic crystals decreases as the charge of the ions _____ and the size of the ions _____.
A
Increases, increases
B
Increases, decreases
C
Decreases, increases
D
Decreases, decreases
Verified step by step guidance1
Understand that lattice energy is the energy required to separate one mole of an ionic solid into its gaseous ions. It is influenced by the charges of the ions and the distance between them.
Recall that lattice energy is directly proportional to the product of the charges of the ions. This means that as the charge of the ions increases, the lattice energy increases.
Remember that lattice energy is inversely proportional to the distance between the ions, which is related to the size of the ions. As the size of the ions increases, the distance between them increases, leading to a decrease in lattice energy.
Combine these concepts: if the charge of the ions decreases, the lattice energy decreases. Similarly, if the size of the ions increases, the lattice energy decreases.
Conclude that the lattice energy for ionic crystals decreases as the charge of the ions decreases and the size of the ions increases.
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