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anything that has mass and takes up space


completely uniforn at the macroscopic level and consists of one or more substances in the same phase


may appear completely uniform, but on closer examination, are not

physical properties

properties that can be observed and measured without changing the composition of a substance


the ratio of mass of an object to its volume

physical changes

changes involving physical properties

chemical changes

changes in which one or more substances (reactants) are transformed into one or more different substances (products)

metric system

the standard system for recording and reporting measurements


how well several determinations of the same quantity agree


the agreement of a measurement with accepted value of the quantity

average deviation

the calculated difference between experimental result and average result

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