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Compounds containing predominantly covalent bonds.

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Amide

Compound containing the O-C-N group.Compound that can be considered a derivative of ammonia in which one or more hydrogens are replaced by a alkyl or aryl groups.

 

Delocalization

Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.

Cloud Chamber

A device for observing the paths of speeding particiles as vapor molecules condense on them to form foglike tracks.

Endothermicity

The absorption of heat by a system as the process occurs.

Electroplating

Plating a metal onto a (cathodic) surface by electrolysis.

Primary Voltaic Cells

Voltaic cells that cannot be recharged, no further chemical reaction is possible once the reactants are consumed.

Exothermicity

The release of heat by a system as a process occurs.

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Adsorption

Adhesion of a species onto the surfaces of particles.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Bomb Calorimeter

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

Standard Electrodes

Half-cells in which the oxidized and reduced forms of a species are present at unit activity, 1.0M solutions of dissolved ions, 1.0atm partial pressure of gases, and pure solids and liquids.

Activity of a component of ideal mixture

A dimensionless quantity whose magnitude is: equal to molar concentration in an ideal solution, equal to partial pressure in an ideal gas mixture, and defined as 1 for pure solids or liquids.

Capillary Action

The drawing of a liquid up the inside of a small-bore tube when adhesive forces exceed cohesive forces, or the depression of the surface of the liquid when cohesive forces exceed the adhesive forces.

Electrolysis

Process that occurs in electrolytic cells.

Standard Entropy

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

Effective Molality

The sum of the molalities of all solute particles in a solution.

Specific Gravity

The ratio of the density of a substance to the density of water.

Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.