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Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

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Stoichiometry

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

Dextrorotatory

Refers to an optically active substance that rotates the plane of plane polarized light clockwise, also called dextro.

Single Bond

Covalent bond resulting from the sharing of two electrons (one pair) between two atoms.

Molar Solubility

Number of moles of a solute that dissolve to produce a litre of saturated solution.

Chemical Equation

Description of a chemical reaction by placing the formulas of the reactants on the left and the formulas of products on the right of an arrow.

Salt Bridge

A U-shaped tube containing electrolyte, which connects two half-cells of a voltaic cell.

Debye

The unit used to express dipole moments.

Gem-dimethyl group

Two methyl groups of the same carbon atom.

History of fireworks

There is an assumption that the history of fireworks started in China, about 2000 years ago. It is possible that the Chinese accidentally discovered explosions by burning bamboo canes.

Dosimeter

A small, calibrated electroscope worn by laboratory personnel and designated to detect and measure incident ionizing radiation or chemical exposure.