R- radiation
- Energy emitted from some object.
- radical
- A species with an odd number of
electrons; formerly called free radical.
- radioactivity
- The spontaneous emission of particles
and/or energy from atomic nuclei.
- radioisotope
- Contraction for words "radioactive
isotope" of an element.
- reactant
- A starting material in a chemical
reaction.
- reactivity
- The degree to which a substance will
respond to a stimulus or interact with another substance.
- receptor
- Protein molecules on the surface of
cell membranes used for communication between cells.
- recycling
- To treat or process waste materials so
as to make them suitable for reuse. The key to successful recycling
of materials contained in refuse lies in the separation of
recyclable components from the main bulk of the waste.
- reducing
- The gain of electrons by an atom, ion,
or molecule.
- reduction
- A gain of electrons; a decrease in
oxidation state.
- refrigerant
- A chemical used in refrigeration, to
keep substances cool.
- resistance
- The opposition of a substance to the
passage through it of a steady electric current.From Ohm's Law, R =
E/I, the resistance equals the voltage of the cell divided by the
current flow.
- resonance structure
- Possible structures of a molecule for
which more than one electron-dot structure can be written, which
differ in the bond pairs between atoms.
Glossary created by David Shaw (Madison Area Technical College) for The Chemistry Place. Information Please® Chemistry Place, ©2005 Pearson Education, Inc. All Rights Reserved.
|
