Delores Jean Brooks - Percy Lavon Julian H. S. 

The Water Cycle

Delores Jean Brooks Percy Lavon Julian H. S.
10330 South Elizabeth
(773) 535-5170


Grade level 9 Regular/Inclusion

1. To introduce and model the concept of the water cycle.
2. To show how water is circulated from Earth's water sources through the
processes of evaporation and condensation.
3. To show how substances dissolved in water can be separated and/or
recovered through the process of evaporation.

Materials Needed:

Activity 1: Illustration of the water cycle, container of water, eye
dropper, small plastic slide.
Activity 2: Aluminum pan, crushed ice, salt. Clear plastic 2 liter
bottle, warm water, ice cubes.
Activity 3. Hot plate, clear flask or kettle w/spout, rubber tubing
about 12in./30cm, clear wide rimmed glass, ice cubes,
aluminum pan and 4 teaspoons of salt.


Activity 1. Display illustration of The Water Cycle. Prepare slides for
each student, placing 1 drop of water per slide and
distribute (state, save for later observation).
Activity 2. Fill aluminum pan with crushed ice, add salt, stir slightly.
Wait about 15 minutes. See snow appear on outside, and bottom
of pan.
Fill clear plastic 2 liter bottle with 1/2 liter warm water.
Place ice cube on top of bottle opening. See vapor (cloud)
form, wait, observe drop formation, see drops (rain) slide
down side of bottle.
Activity 3. Fill flask or kettle with 1 cup of water and 4t salt. Stir
till dissolved. Connect rubber tubing to kettle or flask
spout, extend rubber tubing so that middle sits in aluminum
pan (may need to be taped down) cover with ice cubes. Allow
open end of tubing to flow into a clear glass. Boil salted
water until all water is evaporated. Observe.

Performance Assessment:

Activity 1. Did water on slide evaporate? Where did it go? If not, state
possible reason, high humidity? not enough time lapsed???
Activity 2. Did snow (frost) appear on outsides and bottoms of pan?
Did water vapor rise and form on the sides of plastic bottle?
Did vapor droplets form and roll down the sides of plastic
Activity 3. When salt was dissolved in water how did water's appearance
When salted water was boiled and vapor cooled, what was left
in the kettle or flask?
What was formed in the clear glass?


Activity 1. The students will observe that the water droplet evaporated
if the air was dry enough for evaporation to occur, as water
is evaporated from our earth's surface.
Activity 2. The students will observe snow (frost) and cloud (vapor)
formation, and rain (water droplets) and associate these
activities with the Earth's collection of water vapor from
it's many water sources and the processes that occur to
change those vapors into rain and snow before they fall again
and again to the earth's surface.
Activity 3. The students will observe the process of distillation, which
may be used for various purposes, but is introduced as a way
of removing the salt from sea (ocean) water.


Today's Basic Science, The Scientist and Tomorrow, Navarra and Zafforoni,
Harper & Row, U.S.A., 1971.
Water Science, Water Fun, Great things to Do with H2O, Fiarotta &
Fiarotta, Sterling Company, Inc., New York, 1996.

Return to Chemistry Index