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A small amount of radioisotope replacing a nonradioactive isotope of the element in a compound whose path (for example, in the body) or whose decomposition products are to be monitored by detection of radioctivity, also called a radioactive label.

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Hydrate Isomers

Isomers of crystalline complexes that differ in whether water is present inside or outside the coordination sphere.

Pineapple literally "erodes" the tongue

Everyone who has ever tried fresh pineapple knows that if you eat too much, your lips and tongue hurt for a while. This is because the pineapple contains an enzyme called bromelain. This enzyme literally "erodes" the tongue.

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

20 interesting chemistry facts

20 interesting chemistry facts.

Frasch Process

Method by which elemental sulfur is mined or extracted. Sulfur is melted with superheated water (at 170°C under high pressure) and forced to the surface of the earth as a slurry.

 

Chemistry of the sky

Chemistry can teach us about the composition of celestial bodies and determine their age.

Secondary Voltaic Cells

Voltaic cells that can be recharged, original reactanats can be regenerated be reversing the direction of the current flow.

Joule

A unit of energy in the SI system. One joule is 1 kg. m2/s2 which is also 0.2390 calorie.

Physical Change

A change in which a substance changes from one physical state to another but no substances with different composition are formed. Example Gas to Liquid - Solid.