September 08, 2016
Gas
liquid
Solid
different
same
= oxygen
= ozone
graphite
diamond
Buckminster
fullerene
Diatomic Elements
2 atoms
different
different
H2, He, N2, O2, F2, Cl2, Ne, Ar, Kr, Xe, Rn
Br2 = nonmetal Hg = metal
substance - a sample of
matter that always has the
same physical and chemical
properties
homogeneous
element -
only one kind
of atom -
cannot be
broken down
by a chemical
change
compound - 2 or
more different
elements that
are chemically
bonded - can be
broken down in
a chemical
reaction
mixture - combination of two or
more substances - not chemically
combined - can be separated by
physical means - each component
retains it's own properties
Homogeneous
mixture- uniform
(the same
throughout)
2 or more
substances
physically
combined
Ex air, brass, salt
water
Heterogenous
not uniform
(not the same
throughout)
not uniformly
mixed
ex: soil,
oil and water,
cement
7 diatomic elements
