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25 Cards in this Set

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Chemistry
the field of study concerned with the characteristics, composition, and transformations of matter.
Matter
anything that has mass and occupies space.
Mass
the amount of matter present in a sample.
Solid
definite shape and a definite volume.
Liquid
indefinite shape and definate volume
Gas
indefinate shape indefinate volume
Property
distinguishing characteristic of a substance that is used in its identification and description
Physical property
charactersitic of a substance that can be observed w/out changing the basic identity of the substance (odor,color,state)
Chemical property
charactersitic of a substance that describes the way the subsatance undergoes or resists change to form a new substance.
physical change
process in which a substance changes its physical appearance but not its chemical composition.
chemical change
process in which substance undergoes a change in chemical composition.
pure substance
singel kind of matter that can't be separated into other kinds of matter by any physical means.
mixture
physcial combination of 2 or more pure substances in which each substance retains its own chemical identity.
heterogeneous mixture
contains visibly different phases (ie. chocolate chip cookies)
homogeneous mixture
contains only 1 visibly distinct phase which has uniform properties throughout.
element
a pure substance that can't be broken down into simpler pure substances by chemical means such as a chemical reaction, an electric current, heat or a beam of light.
compound
a pure substance that can be broken down into 2 or more simler pure substances by chemical means.(i.e water)
chemical symbol
a 1 or 2 letter designation fora n element derived from the the element's name.
atom
smallest particle of an element that can exist and still have the properties of the element.
molecule
a group of 2 or more atoms that functions as a unit because the atoms are tightly bound together.
diatomic molecule
molecule that contains 2 atoms.
triatomic molecule
moleucle that contains 3 atoms.
homoatomic molecule
a molecule in which all atoms present are of the same kind
heteroatomic molecule
a molecule in which 2 or more kinds of atoms are present.
chemical formula
a notation made up of the chemical symbols of the elements present in a compound and numerical subscripts that indicate the number of atoms of each element present in a moleucle of the compound.