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A compound consisting of three elements, may be ionic or covalent.

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Hydrophilic Colloids

Colloidal particles that repel water molecules.

Homogeneous Equilibria

Equilibria involving only one species in a single phase. For example, all gases, all liquids or all solids.

Functional Group

A group of atoms that represents a potential reaction site in an organic compound.

Ferromagnetism

The ability of a substance to become permanently magnetized by exposure to an external magnetic field.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Equivalent Weight

An oxidizing or reducing agent, who's mass gains (oxidizing agents) or loses (reducing agents) 6.022 x 1023 electrons in a redox reaction.
The mass of an acid or base that furnishes or reacts with 6.022 x 1023 H3O+ or OH- ions.

Sublimation

The direct vaporization of a sold by heating without passing through the liquid state.

Electrophile

Positively charged or electron-deficient.

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Crystal Lattice Energy

Amount of energy that holds a crystal together, the energy change when a mole of solid is formed from its constituent molecules or ions (for ionic compounds) in their gaseous state.