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A hypothetical gas that obeys exactly all postulates of the kinetic-molecular theory.

 

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Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

Enzyme

A protein that acts as a catalyst in biological systems.

Differential Scanning Calorimetry (DSC)

A technique for measuring the temperature, direction, and magnitude of thermal transitions in a sample material by heating/cooling and comparing the amount of energy required to maintain its rate of temperature increase or decrease with an inert reference material under similar conditions.

Endothermic

Describes processes that absorb heat energy.

Electronic Geometry

The geometric arrangement of orbitals containing the shared and unshared electron pairs surrounding the central atom of a molecule or polyatomic ion.

London Forces

Very weak and very short-range attractive forces between short-lived temporary (induced) dipoles, also called dispersion Forces.

Heat of Condensation

The amount of heat that must be removed from one gram of a vapor at it's condensation point to condense the vapour with no change in temperature.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Mechanism

The sequence of steps by which reactants are converted into products.

Freezing Point Depression

The decrease in the freezing point of a solvent caused by the presence of a solute.ing Point