H- half-cell
- An oxidation or reduction reaction
that occurs at an electrode.Two half-cells must be combined to form
an electrochemical cell.
- half-life
- The time required for concentration of
one substance to reach half of its initial value.The time it takes
for one half of a substance to be metabolized and/or excreted from
the body.
- half-reaction
- A reaction that shows the electrons
involved in an oxidation or reduction step of a reaction.
- halide
- A negatively charged ion of the group
VIIA elements.
- halogen
- The group VIIa elements in the
periodic table.
- heat
- The transfer of (thermal) energy
between two objects that are at different temperatures.
- Henry's Law
- The amount of gas dissolved in a solution is directly
proportional to the pressure of the gas above the solution.
- heterocycle
- A compound containing at least one
ring that consists of both carbon and non-carbon atoms .
- heterogeneous
- Describes a material or substance or
chemical reaction which is not the same throughout in its
properties, composition, or state of matter.
- homeopathy
- A system of disease treatment
involving application of minute doses of a remedy that, in a
healthy person, would produce symptoms of the disease.
- homogeneous
- Describes a material or substance or
chemical reaction which is the same throughout in its properties,
composition, or state of matter.
- hybridization
- A mixing process, often applied to
description of atomic orbitals, producing orbitals that have
characteristics intermediate between the various types of orbitals
involved.
- hydrate
- A crystalline solid with molecules of
water trapped in the solid state structure, which can often be
removed partly or completely by relatively gentle heating.
- hydration
- Having solvent molecules of water
surrounding and becoming attached to ions or molecules of the
solute.
- hydrocarbon
- An organic compound containing only
the elements hydrogen and carbon.
- hydrolysis
- Cleavage of a covalent bond brought
about by water; the H- and -OH of water typically become attached
to the respective cleavage fragments.For example:
- hydrolyze
- To add hydrogen or hydroxyl to a
substance.
- hypothesis
- A scientific "hunch," a tentative
explanation of or prediction derived from experimentation.
Glossary created by David Shaw (Madison Area Technical College) for The Chemistry Place. Information Please® Chemistry Place, ©2005 Pearson Education, Inc. All Rights Reserved.
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