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The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.

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Molecular Geometry

The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

Energy

The capacity to do work or transfer heat.

D -Transition elements (metals)

B Group elements except IIB in the periodic table, sometimes called simply transition elements EX. Fe, Ni, Cu, Ti .
For further information see Metals.

Effective Collisons

Collision between molecules resulting in a reaction, one in which the molecules collide with proper relative orientations and sufficient energy to react.

 

Half-Life

The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

Formula

Combination of symbols that indicates the chemical composition of a substance.

 

Breeder Reactor

A nuclear reactor that produces more fissionable nuclear fuel than it consumes.

Phenol

Hydrocarbon derivative containing an [OH] group bound to an aromatic raing.

 

Valence Bond Theory

Assumes that covalent bonds are formed when atomic orbitals on different atoms overlap and the electrons are shared.

Flux

A substance added to react with the charge, or a product of its reduction, in metallurgy, usually added to lower a melting point.

Density

Density is the ratio b/w Mass and Volume: D=M/V

Surface Tension

It is the force in dynes acting along the surface of the liquid 1cm in length and perpendicular to it.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Percent Composition

The mass percent of each element in a compound.

Denatured

A commercial term used to describe ethanol that has been rendered unfit for human consumption because of the addition of harmful ingredients to make it sales tax-expempt.

 

Metallurgy

Refers to the overall processes by which metals are extracted from ores.

Indicators

For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.

Electronic Geometry

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