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A device used to measure the heat transfer between system and surroundings at constant volume.

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Inhibitory Catalyst

An inhibitor, a catalyst that decreases the rate of reaction.

Pairing

A favourable interaction of two electrons with opposite m , values in the same orbital.

Homogeneous Equilibria

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

Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.

Period

The elements in a horizontal row of the periodic table.

Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

Eluant or eluent

The solvent used in the process of elution, as in liquid chromatography.

 

Electron Configuration

Specific distribution of electrons in atomic orbitals of atoms or ions.

Phase Diagram

Diagram that shows equilibrium temperature-pressure relationships for different phases of a substance.

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.