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17 Cards in this Set
- Front
- Back
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base unit
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a defined unit in a system of measurement that is based on an object or event in the physical world and is independent of other units.
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chemical change
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a process involving one or more substances changing into new substances;also called a chemical reaction
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density
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a ratio that compares the mass of an object to is volume
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dimensional analysis
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a problem-solving method that focuses on the units that are used to describe matter.
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heterogeneous mixture
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one that does not have a uniform compostionn and in which the individual substance remain distinct.
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element
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a pure substance that cannot be broken down into simpler substances by physical or chemical means
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physical properties
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a characteristic of matter that can be observed of measured without changing the sample's componesition- for example, density, color, taste, hardness, and melting point.
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physical change
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a type of change that alters the physical properties of a substance but does not change its composition
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scientific notation
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expresses numbers as a multiple of two factors- a number between 1 and 10 raised to a power, or exponents; makes it easier to handle extremely large of small measurements.
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intensive property
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a physical property that remains the same no matter how much of a substance is present.
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derived unit
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a unit defined by a combination of base units
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chemical properties
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the ability of inability of a substance to combine with or change into one or more new substances
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mixture
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a physical blend of two or more pure substances in any proportion in which each substance retains its individual properties; can be separated by physical means
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compound
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a chemical combination of two or more different elements; can be broken down into simpler substances by chemical means and has properties differnet from those of its component elements.
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homogeneous mixture
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one that has a uniform compostion throughout and always has a single phase; also called a solution
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signigicant figures
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the number of all known digits reported in measurements plus one estimated digit.
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extensive property
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a physical property, such as mass length, and volume, that is dependent upon the amount of substance present
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