Chemistry Terms - A

15 cards·by tiffreja

termschemistryvocabsciencevocabulary

Absolute zero

a theoretical condition concerning a system at zero Kelvin where a system does not emit or absorb energy (all atoms are at rest)

Accuracy

how close a value is to the actual or true value

Acid

a compound that, when dissolved in water, gives a pH of less than 7.0 or a compound that donates a hydrogen ion

Acid anhydride

a compound with two acyl groups bound to a single oxygen atom

Acid dissociation constant

an equilibrium constant for the dissociation of a weak acid

Actinides

atomic numbers 90-103; shows more variable valency than lanthanoids; all actinides are radioactive; all but thorium and uranium are man made

Activated complex

a structure that forms because of a collision between molecules while new bonds are formed

Addition reaction

within organic chemistry, when two or more molecules combine to make a larger one

Aeration

the mixing of air into a liquid or solid

Alkali metals

the metals of Group 1 on the periodic table

Alkaline earth metals

the metals of Group 2 on the periodic table

Anion

negatively charge ions

Atom

a chemical element in its smallest form, and is made up of neutrons and protons within the nucleus and electrons circling the nucleus

Atomic number

the number representing an element which corresponds with the number of protons within the nucleus

Atomic orbital

the region where the electron of the atom may be found