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Where this fits
precision
how close several measurements are to each other
accuracy
how close a single measurement is to the true value
sig fig rules
zeros that come BEFORE non-zero digits are NOT significant
homogeneous
a mixture of 2 or more substances that are evenly distributed and which cannot be visually
distinguished
heterogeneous
a mixture of 2 or more substances that can still be seen as separate parts
physical properties
can be seen or measured without changing the substance
chemical properties
require the substance to change to a new substance
precipitate
a reaction in which an insoluble solid is formed as a product
element
a substance consisting of atoms which all have the same number of protons
compound
a substance formed when two or more chemical elements are chemically bonded together
mixture
made up of two or more different substances which are mixed but not combined chemically
ion
an electrically charged atom or group of atoms formed by the loss or gain of one of or more
electrons
thompson experiment
the plum pudding model believed that the negatively charged electrons were embedded in a
sphere or cloud positively matter
rutherford
positive charges were distributed evenly within an atom