Penny Slider Test
to the image on the next slide.
of a LIQUID?
in a tall
clear glass
a tablespoon
at a time.
STIR.
the egg
float:
cause the egg
not to float?
1. Too little salt is added.
2. The salt has not been
stirred into solution.
3. The egg is too small
and dense to float.
4. The egg has been cooked.
gently into a glass
2/3 full of water.
in the middle of the glass:
the more dense salt solution below and
the less dense clear water above.
Slowly add clear water
above the egg.
What happens?
The egg is less DENSE than the salt water-- so it floats.
in salt water,
because salt water
has greater density
than fresh water.
to float in
salty ocean water
or a pool of
fresh water?
To answer that question
let's first consider:
HOW SMALL,
IS SMALL?
question mark
the for answer.
the density of water?
into another spoon.
What a silly question.
Divide each portion in half.
Is each half-of-a-half still water?
What if you keep going?
Divide the water in half,
over and over again,
into smaller and smaller portions.
a tablespoon of water
in half about 78 times,
you would have divided
the water to its limit.
WHY?
into which you can divide water
before it stops being water?
ONE molecule of water
in each spoon.
That’s the limit.
The END.
WHY?
If you could divide
the ONE water MOLECULE
any further,
it would no longer
BE a water MOLECULE.
It would be BROKEN into ATOMS.
MOLECULE looks like--
sort of, if you could see it,
which you cannot.
It’s too small.
atoms
atom
the water molecule: H2O. WATCH!
stand for?
stand for?
change the density of WATER?
Small cups
Marbles
Puff balls
THE SAME DENSITY
sodium chloride (NaCl).
The dissolved salt increases
the MASS of the water
without much increase in VOLUME.
So SALT water is MORE dense
than PLAIN water.
Like the puff balls
compressed between the marbles,
SALT WATER has more ATOMS packed
into the same space as pure water.
is the
amount
of matter
in an object.
than water will do what?
greater density than
water float or sink in water
density of water
the egg float
or will it float in plain water
to increase its density.


































