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