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chemistry
paper 2
chemical analysis
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Cards (14)
a
pure
substance contains only one type of element or
compound.
pure substances
melt and
solidify
at one
fixed
temperature.
boil
and condense at one temperature
impure
substances change state at a range of
temperatures.
formulations
are mixtures designed to have specific
properties.
examples of formulations:
fuels
cleaning
agents
paints
medicines
fertilizers
chromatography involves:
a
stationary
phase
a
mobile
phase (moving)
in paper chromatography:
the
stationary
phase is the
absorbent
paper.
the
mobile
phase is the
solvent
, often
water.
during chromatography
mixtures are separated into their
components.
the
solvent
dissolves the samples and carries them up the water.
each
component
moves a different
distance
up the paper, depending on the
attraction
to the paper and
solvent.
chromatography:
draw a start line in
pencil
put samples of
food coloring
unknown
substance (x)
dip the paper in the
solvent
wait
identify the
unknown
substance.
hydrogen test:
squeaky pop.
hydrogen test:
hold a
lit
splint over a
tube
with the gas in
if its
hydrogen
it will make a
squeaky
pop.
chlorine test:
dunk
litmus
paper in substance
if chlorine litmus paper will turn
white.
oxygen:
hold a
glowing
splint over a test tube of gas.
if oxygen the splint will
relight.
carbon dioxide:
bubble through
limewater
if carbon dioxide, limewater will turn
cloudy.