Requires: wax, crayons, string, pan, heating element, water and 2 cans
Favorite childhood activities are used to explore the changes of state of matter.
These changes in state include: melt, freeze, evaporate, boil and condense.
Through videos and a simulation students learn that all matter is made of particles.
to the image on the next slide.
a solid
to a liquid
is called
a liquid to a solid is called
when a liquid changes to a gas?
There are actually two names.
Do you know them?
how much water
is left each day.
to evaporate from each container?
Which is faster?
Set both aside.
into a dry flat
pan or dish.
test tube
with water.
tube with water.
surface of the glass.
CONDENSES water vapor
out of the air
onto the surface of the cup.
with ice cubes.
Where did the water on the
outside of the glass come from?
water condensation:
in the shower?
on car windows?
on a cold glass?
it is called CONDENSATION!
a fixed shape
of matter
the container it is in.
a solid, to a liquid and to a gas.
into the can and place the can
in the pan
of water.
to melt the wax
and crayons.
FROM
THE
HEAT.
into the wax.
by dipping it
into COLD water.
over and over.
WATER
WAX
SOLID candle wax into
LIQUID wax and then to a GAS,
burn the candle.
This change is called
a PHYSICAL change,
a CHANGE of STATE,
from a soli, to a liquid, to a gas.
Burning a candle uses
COMBUSTION!
Which also produces
CHEMICAL changes in the wax.
Let's explore
what is happening.
when you burn a candle,
find these items.
spoon
(with a holder)
(no lid required)
it QUICKLY from above.
What does this show?
2. Use the spoon, as shown in the
video, to CONDENSE the wax that
is now a gas, back to a solid on
the bottom surface of the spoon.
What type of change is THIS?
3. Use the glass jar to show that
a CHEMICAL change is happening
to the wax with combustion.
How is a chemical change
different from a physical one?
the candle and is still hot and burns easily, relighting the candle.
The wax, that is now a GAS
near the bottom of the wick,
condenses back into a SOLID
on the COLD suface of the spoon.
the chemical formula of a substance.
Water (H2O) is still H2O, whether it is
a solid, a liquid or a gas. Wax is still wax, regardless of its state.
What is a CHEMICAL change?
JUMP to 1.14 seconds
into the video for the experiments.
turns the liquid wax into a hot gas. These vaporized
wax molecules are drawn up into the flame, where they react with oxygen (O2) from the air, to create heat,
light, water vapor (H2O) and carbon dioxide (CO2).
What is left is NO LONGER WAX! This is a CHEMICAL CHANGE because the atoms in wax have been recombined into new substances: H2O and CO2.
to explore with candles.
If you want to make
more candles,
here's your chance!
pour the wax
into the mold.
such as a pint milk carton
(500 ml).
Cut off the lid.
if you used a soft mold.
center the wick over the mold.
Candle-Making Ideas
Liquids
Gases
States of Matter
2. In which state of matter do the particles go to the bottom and slip and slide past each other, but stay together?
3. In which state of matter are the particles more rigidly packed together and have their own shape? Do they still move?
on Electra.
select the red button.
2. Liquid
3. Solid, yes
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