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Activation energy

the threshold energy that must be overcome to produce a

Auto-ionization

the transfer of a proton from one molecule to another of the

Ampere

the unit of measurement for electric current; 1 ampere is equal to 1

Atomic mass (weight)

the weighted average mass of the atoms in a naturally

Atomic radius

half the distance between the atomic nuclei in a molecule

Alkali metal

a Group 1 metal

Alkaline earth metal

a Group 2 metal

Alpha-particle production

a common mode of decay for radioactive nuclides in

Arrhenius concept

a concept postulating that acids produce hydrogen ions in

Alloy steel

a form of steel containing carbon plus metals such as chromium,

Actinide series

a group of fourteen elements following actinium on the periodic

Alpha () particle

a helium nucleus produced in radioactive decay

Anion

a negative ion

Amine

a organic base derived from ammonia in which one or more of the

Aufbau principle

a principle stating that as protons are added one by one to the

Alkane

a saturated hydrocarbon with the general formula CnH2n + 2

Atomic solid

a solid that contains atoms at the lattice points

Amphoteric sunstance

a substance that can behave either as an acid or as a

Alloy

a substance that contains a mixture of elements and has metallic

Acid-base indicator

a substance that marks the end point of an acid-base

Acid

a substance that produces hydrogen ions in aqueous solution; a proton

-Amino acid

an organic acid in which an amino group, a hydrogen atom, and

Aldehyde

an organic compound containing the carbonyl group bonded to at

Alcohol

an organic compound in which the hydroxyl group is a substituent on a

Alkene

an unsaturated hydrocarbon containing a carbon-carbon double bond.

Alkyne

an unsaturated hydrocarbon containing a carbon-carbon triple bond.

Air pollution

contamination of the atmosphere, mainly by the gaseous products

Avogadro's law

equal volumes of gases at the same temperature and pressure

Anode

in a galvanic cell, the electrode at which oxidation occurs

Aromatic hydrocarbon

one of a special class of cyclic unsaturated

Acid rain

rainwater with an acidic pH; a result of air pollution by sulfur dioxide

Atom

the fundamental unit of which elements are composed

Atmosphere

the mixture of gases that surrounds the earth's surface

Avogadro's number

the number of atoms in exactly 12 grams of pure 12C,

Atomic number

the number of protons in the nucleus of an atom; each element


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