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Chemistry 1 (H)- Chapter 1

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matter
anything that has mass and takes up space
homogenous
completely uniforn at the macroscopic level and consists of one or more substances in the same phase
heterogenous
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
density
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
precision
how well several determinations of the same quantity agree
accuracy
the agreement of a measurement with accepted value of the quantity
average deviation
the calculated difference between experimental result and average result