http://www.ck12.org Chapter 27. Glossary
sublimation
The change of state from a solid to a gas without passing through the liquid state.
substance
Matter that has a uniform and definite composition.
substitution reaction
A reaction in which one or more atoms replace another atom or group of atoms in a molecule.
substrate
The molecule or molecules on which an enzyme acts.
supersaturated solution
A solution that contains more than the maximum amount of solute that is capable of being dissolved at a given
temperature.
surface tension
A measure of the elastic force in the surface of a liquid.
surroundings
Everything in the universe that is not part of the system.
suspension
A heterogeneous mixture in which some of the particles settle out of the mixture upon standing.
system
The specific portion of matter in a given space that is being studied during an experiment or an observation.