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Chemistry- Quater Final
matter & pressure
19
Chemistry
11th Grade
10/22/2008

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Term
matter
Definition
anything that has mass and volume
Term
pure substance
Definition
made up of only one type of atom or molecule, fixed composition and distinct properties, cannot be separated by physical means
Term
element
Definition
substance that cannot be decomposed into simpler substances
Term
compound
Definition
substance containing more than one element, chemically combined always contains definite or constant proportions of the elements by mass
Term
mixture
Definition
Matter that is made of two or more substances in which each substance retains its own chemical identity.
Term
homogeneous mixture
Definition
mixture in which the substances are uniformly distributed. aka SOLUTION
Term
heterogeneous mixture
Definition
A mixture in which the substances are not uniformly distributed
Term
suspension
Definition
heterogeneous mixture of a solvent-like substance with particles that
slowly settle out. particle size are large and more dense when compared to water molecules
Term
colloid
Definition
heterogeneous mixture consisting of particles intermediate in size between those in solutions and those in suspensions
Term
liquid that passes through filter paper
Definition
filtrate
Term
bits of solid left of filter paper
Definition
residue
Term
filtering
Definition
used to separate suspensions. only works if particles are large enough to get "stuck" in filter paper
Term
centrifuge
Definition
process used to separate liquids and solids when particles are too small and pass through filter paper. the larger particles are pulled to the outside
Term
decanting
Definition
pouring off the top layer . immiscible liquids only
Term
evaporation
Definition
used to obtain the solute from the solution
Term
solute
Definition
solid in solution
Term
solvent
Definition
liquid in solution
Term
distillation
Definition
used to separate miscible liquids. heat the mixture. used when you want both things or what has lowest boiling point . goes from liquid- to water vapor (steam) into liquid (from cold around tube)
Term
chromatography
Definition
A technique in which molecules in a mobile phase are separated because of their different affinities for a stationary phase
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