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Introduction to Matter
Vocabulary
27
Science
6th Grade
01/28/2010

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Term
Matter
Definition
the “stuff” that makes up everything in the universe
Term
Principal states of Matter
Definition
the three basic states that matter can be found in (solid, liquid, gas)
Term
Characteristic Properties
Definition
a quality of a substance that never changes and can be used to identify the substance
Term
Boiling Point
Definition
the temperature at which a substance changes from a liquid to a gas
Term
Melting Point
Definition
the temperature at which a substance changes from a solid to a liquid
Term
Physical Changes
Definition
a change in a substance that does not change its identity
Term
Chemical Changes
Definition
a change in which one or more substances combine or break apart to form new substances
Term
Chemical Activity
Definition
a characteristic property of a substance that indicates its ability to undergo a specific chemical change
Term
Mixture
Definition
two or more substances that are in the same place but are not chemically combined
Term
Solution
Definition
the “best mixed” of all possible mixtures (ex. Salt water or sugar water)
Term
Pure Substance
Definition
a substance made of only one kind of matter and has definite properties
Term
Elements
Definition
pure substances that cannot be broken down into other substances by any physical or chemical means
Term
Compound
Definition
a substance made of two or more elements that are chemically combined
Term
Weight
Definition
a measure of the force of gravity on an object
Term
Mass
Definition
a measurement of how much matter is in an object
Term
International System of Units
Definition
the system of units used by scientists to measure the properties of matter
Term
Volume
Definition
the amount of space that matter occupies
Term
Density
Definition
the measurement of how much mass of a substance is in a given volume
Term
Archimedes
Definition
a Greek scientist who is credited with first discovering and using the principles of density
Term
Atom
Definition
the smallest particle of an element
Term
Democritus
Definition
Greek philosopher to coin the term “atomos” or atom, after he theorized that there was a “smallest” piece of matter
Term
John Dalton
Definition
British schoolteacher who established the atomic theory based on observations of experiments that he carried out
Term
Molecule
Definition
a group of atoms that are joined together and act as a single unit
Term
Chemical Bond
Definition
the force that holds two atoms together
Term
Ore
Definition
any rock that contains a metal or other economically useful material
Term
Electrolysis
Definition
a process by which an electric current breaks chemical bonds
Term
Electrode
Definition
a metal strip that conducts electricity; often used in an electrolysis process
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