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An organic ion carrying a negative charge on a carbon atom.

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Electronic Geometry

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

Chemical Bonds

The attractive forces that hold atoms together in elements or compounds.

Percent Purity

The percent of a specified compound or element in an impure sample.

Alpha (a) Particle

Helium ion with 2+ charge, an assembly of two protons and two neutrons.

Solvent

The dispersing medium of a solution.

Intermolecular Forces

Forces between individual particles (atoms, molecules, ions) of a substance.

Specific Gravity

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

Zinc

Discovered: known in India and China before 1500 and to the Greeks and Romans before 20 BC as the copper-zinc alloy brass
Origin: The name is derived from the German ‘Zink’.
Atomic no: 30
Mass No: 65
Description: A grey metal with a blue tinge. World production exceeds 7 million tons a year, and it is used to galvanise iron to prevent it rusting. It is also employed in alloys and batteries, and as zinc oxide to stabilise rubber and plastics. Zinc is essential for all living things, and is important for growth and development. The average human body contains about 2.5 grams and takes in about 15 milligrams per day. Some foods have above average levels of zinc, including herring, beef, lamb, sunflower seeds and cheese.

Ionic Compounds

Compounds containing predominantly ionic bonding.

Transition State Theory

Theory of reaction rates that states that reactants pass through high-energy transition states before forming products.

Degenerate

Of the same energy.

Boron Hydrides

Binary compounds of boron and hydrogen.

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).

Differential Thermal Analysis (DTA)

A technique for observing the temperature, direction, and magnitude of thermally induced transitions in a material by heating/cooling a sample and comparing its temperature with that of an inert reference material under similar conditions.

Clay

A class of silicate and aluminosilicate minerals with sheet-like structures that have enormous surface areas that can absorb large amounts of water.

Alums

Hydrated sulfates of the general formula M+M3+(SO4)2.12H2).

xylidine

Any of six isomeric compounds that have the formula C8H11N, are derivatives of xylene, and resemble aniline: used in dye manufacture.

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Double Salt

Solid consisting of two co-crystallized salts.

 

Polar Bond

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