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451 Topic Pages Found in Chemistry
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Open Absorption

In physics, taking up of matter or energy of one substance by another, such as a liquid by a solid (ink by blotting paper) or a gas by a liquid

Open Acid rain
Acid rain

Acidic precipitation thought to be caused mainly by the release into the atmosphere of sulphur dioxide (SO 2 ) and oxides of nitrogen (NO x ), which

Open Acids

In chemistry, compound that releases hydrogen ions (H + or protons) in the presence of an ionizing solvent (usually water). Acids react with bases to

Actinide elements

(a series of radioactive metallic elements in Group 3 of the periodic table . Members of the series are often called actinides, although actinium (at.

Open Actinium

( ăktĭn'ēӘm ) [Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; mass number of most stable isotope 227; m.p. about 1,050 degrees

Activation energy

in chemistry, minimum energy needed to cause a chemical reaction . A chemical reaction between two substances occurs only when an atom, ion, or

Open Addition reactions
Addition reactions

Chemical reaction in which the atoms of an element or compound react with a double bond or triple bond in an organic compound by opening up one of the


Bonding agents are called adhesives or glues. They may be made from natural substances or artificial materials. They bind together metals, wood,

Open Agates

( ăg'ĭt ), translucent, cryptocrystalline variety of quartz and a subvariety of chalcedony . Agates are identical in chemical structure to jasper,

Open Air pollution
Air pollution

contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The