List some properties of a substance that would lead you to believe that the substance consists o

step 1 Several compounds contain ions. We can recognize such substances by their characteristic propert

List some properties of a substance that would lead you to...

Key Concepts

Ionic Bonding

Ionic bonding involves the transfer of electrons from one atom to another, resulting in the formation of oppositely charged ions that attract each other. This electrostatic attraction forms a strong bond that holds the ions together in a rigid, repeating crystal lattice, which is characteristic of substances composed of ions.

Crystal Lattice Structure

Ionic compounds typically arrange themselves in regular, repeating crystal lattices, where the orderly pattern maximizes attractive forces and minimizes repulsive forces. This ordered structure contributes significantly to the physical properties of the substance, such as its high melting point and brittleness.

High Melting and Boiling Points

Due to the strong electrostatic forces between the oppositely charged ions within the crystal lattice, a significant amount of energy is required to break these bonds. This results in ionic substances generally having much higher melting and boiling points compared to nonionic, covalently bonded compounds.

Electrical Conductivity

Ionic compounds can conduct electricity when they are either molten or dissolved in water because the ions are free to move and carry charge. In contrast, in the solid state the ions are locked in place within the crystal lattice, preventing electrical conductivity.

Contrast with Nonionic (Covalent) Compounds

Substances that consist of nonionic, typically covalent compounds, have molecules held together by shared electrons rather than full charges. This results in different physical properties such as lower melting and boiling points, lack of electrical conductivity in solution, and often a softer, more flexible structure compared to the rigid and brittle nature of ionic compounds.

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