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
properties that can be observed and measured without changing the composition of a substance
the ratio of mass of an object to its volume
changes involving physical properties
changes in which one or more substances (reactants) are transformed into one or more different substances (products)
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
the calculated difference between experimental result and average result
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