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24 Cards in this Set
- Front
- Back
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chemistry
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the study of the composition of matter and the changes they undergo
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five major branches of chemistry
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analytical chemistry
physical chemistry organic chemistry inorganic chemistry biochemistry |
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theory
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the most logical explanation of events that occurred in nature
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law
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a thoroughly tested theory that is generally accepted as true
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matter
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anything that has mass and takes up space
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mass
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the amount of matter in object contains
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pure substances
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forms of matter that her uniform and have definite composition (water)
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mixtures
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forms of matter that are not uniform. they have more than one kind of matter present (saltwater)
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solid
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the most organized form of matter
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liquid
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form of matter that flows
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gas
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most random form of matter
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physical property
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a property of a pure substance that can be observed or measured without changing the composition (color, state at room temp, density, luster)
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heterogeneous mixture
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a nonuniform mixture (different samples have different portions)
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homogeneous mixtures
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the uniform mixture (all samples from a particular homogeneous mixture will have the same portions)
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solutions
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one particular type of homogeneous mixture with two different phases (liquid dissolved in liquid, solid dissolved in liquid)
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elements
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118 known. The simplest form of a pure substance that still maintains all the physical properties of that substance
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symbols
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letters used to represent elements
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compounds
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the combination of elements chemically bonded together
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chemical formula
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used to represent compounds (C6H12O6)
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chemical reactions
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when one or more substances are changed into new substances
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reactants
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stuff you start with
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products
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what you make
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chemical property
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characteristics that describe a substances ability to undergo chemical reaction
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law of conservation of mass
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mass cannot be created nor destroyed in ordinary chemical reactions or physical change. All mass can be accounted for
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