physical science unit. 1
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25 Terms
pure substance
matter with a fixed composition
pure substance
cannot be physically separated
mixture
no definite composition
mixture
can be separated by heating, cooling, sorting, filtering
element
cannot be broken down into another substance
element
one kind of atom
element
diatomic
element
one or two letter symbols
compound
two different types of elements
compounds
contains atoms that are bonded
compounds
anything not on the periodic table
compound
cannot be physically separated
compound
written using a chemical formula
compound
element abbreviation and subscripts that show the atoms in a compound
compounds
all compounds are molecules but not all molecules are compounds
molecule
when two or more of the same or different atoms join together
heterogeneous
different throughout
heterogeneous
unevenly distributed
suspension
large particles float in a material- can separate
colloid
small particle float in material, some sink
homogeneous
same throughout
homogeneous
evenly distributed
solvent
does the dissolving
solute
what is dissolved