General chemistry

General chemistry

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General chemistry

Allo

Chemistry; General chemistry

A prefix that designates the more stable of a pair of geometric isomers . allo is sometimes used less precisely to designate isomers or close relatives of a compound.

Enkephalins are molecules produced naturally by the central nervous system to numb pain. Enkephalins lock into receptors on the surface of a nerve cell and open ion channels. Ions flow into the cell ...

Nitrogen

Chemistry; General chemistry

Element number 7, a colorless, odorless, tasteless gas that makes up about 80% of the earth's atmosphere.

Thermoplastic

Chemistry; General chemistry

A polymer that softens or melts on heating, and becomes rigid again on cooling. Thermoplastic polymer chains are not cross-linked. Polystyrene is a thermoplastic.

Carbon

Chemistry; General chemistry

An element with atomic number 6. Carbon is a nonmetal found in all organic compounds . Carbon occurs naturally as diamond , graphite , and buckminsterfullerene .

Hypertonic

Chemistry; General chemistry

Describes a solution which has higher osmotic pressure than some other solution (usually, higher osmotic pressure than cell or body fluids). Freshwater fish die if placed in seawater because the ...

Propellant

Chemistry; General chemistry

1. A mixture of fuel and oxidising agent that reacts to produce a high-energy stream of product gases that can produce thrust. For examples, see What makes a good rocket fuel? 2. A compressed gas ...