Question

Which has the higher melting point, LiF or MgO?

   Which has the higher melting point, LiF or MgO?

Chemistry The Science in Context

Chemistry The Science in Context

Thomas R. Gilbert 5th Edition

Chapter 11, Problem 15

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Solved by Expert Charles Thomas

06/15/2020

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Step 1: First, we need to understand that we are comparing the melting points of two ionic compounds, LiF and MgO. Show more…

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Which has the higher melting point, LiF or MgO?

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Key Concepts

Ionic Bonding

Ionic bonding involves the electrostatic attraction between oppositely charged ions, forming a crystalline lattice structure. This type of bonding is characterized by the transfer of electrons from one atom to another, resulting in positively and negatively charged ions whose mutual attractions maintain the integrity of the solid.

Lattice Energy

Lattice energy is the measure of the strength of the forces holding the ions together in an ionic solid. It is defined as the energy required to separate a mole of an ionic compound into its constituent gaseous ions. High lattice energy indicates strong ionic interactions, typically leading to higher melting points.

Ionic Charge and Size

The magnitude of the ionic charges and the sizes of the ions are critical factors that determine the strength of the electrostatic forces in an ionic compound. Higher charges increase Coulombic attraction, and smaller ionic radii allow ions to pack closer together, both of which contribute to higher lattice energy and higher melting points.

Melting Point

The melting point of a substance is the temperature at which it transitions from a solid to a liquid. In the context of ionic compounds, a higher melting point generally reflects a higher lattice energy, meaning that more energy is required to disrupt the strong ionic bonds within the crystalline lattice.

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