General chemistry

General chemistry

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General chemistry

Second

Chemistry; General chemistry

The second (s) is the base unit of time in the SI system of units, defined as the duration of 9,192,631,770 cycles of the radiation associated with a certain colour of light emitted by the cesium ...

A unit of mass equal to 1/12 the mass of a carbon-12 nucleus, which is 1.660 538 73 × 10-27 kg ± 0.000 000 13 × 10-27 kg (1998 CODATA values). Abbreviated as amu or u. Sometimes called the dalton, ...

Fractional distillation

Chemistry; General chemistry

A technique for separation of liquid mixtures by distillation that uses a tower attached to a flask containing the mixture to perform multiple distillations. vapour moving up the column condenses on ...

Patina

Chemistry; General chemistry

A thin layer of corrosion products with a distinctive coloration that forms on a metal surface exposed to air and water. Patina usually refers to the greenish coating that forms on copper alloys ...

Visible light

Chemistry; General chemistry

Visible light is electromagnetic radiation with a wavelength between 400 and 750 nm.

T-shape

Chemistry; General chemistry

A molecular shape that results when there are 3 bonds and 2 lone pairs around the central atom in the molecule. The atoms bonded to the central atom lie at the ends of a "T" with 90° angles between ...

Tyndall effect

Chemistry; General chemistry

Light passing through a colloid is scattered by suspended particles. The light beam becomes clearly visible; this phenomenon is called the Tyndall effect. For example, car headlight beams can be ...