# Crazy crystal creations

Document Sample

```					     SCIENCE FAIR PROJECT                                                               PHYSICAL SCIENCE

Crazy crystal creations!!:)
Objective
1.     Problem: Which of the three temperatures will create the largest and purest crystals?
2.     Hypothesis: We think that the ice bath will produce the largest and purest crystals, the
fringe will make medium and semi-pure crystals, and the room time will produce the
smallest and not very pure crystals.

Materials
• Lab notebook
• Large bowl
• Ice, enough for three large bowls
• Water
• Thermometer
• String
• Scissors
• Pencils (3)
• Identical jars or large drinking glasses
• Pot with a lid
• Borax, found in the laundry isle in most grocery stores (1 box)
• Tablespoon
• Plastic wrap, wax paper, or aluminum foil

Procedures
1. In this science fair project, you'll be recrystallizing borax under three different temperature
conditions: in a refrigerator, at room temperature, and in an ice bath. Before you begin, make a
2. Prepare an ice bath by filling the large bowl half full of ice and then adding water until the
bowl is three-quarters full.

PAGE 1 OF 2                                                    DURATION: TWO CLASSROOM PERIODS
SCIENCE FAIR PROJECT                                                               PHYSICAL SCIENCE

1.      Place the ice bath on a countertop or on a table, where it can be left undisturbed for at
least 5 hours.
3. As soon as the ice bath is prepared, use the thermometer to take the temperature of the ice
bath, of the refrigerator, and of the room (do this by putting the thermometer on the countertop
or table), and record the temperatures in your lab notebook.
4. Cut three pieces of string and tie one around each pencil. The string pieces should be of equal
length and should be long enough that when the pencil is laid across the top of the jar, the end of
the string hangs down to just above the bottom of the jar.
5. Bring enough water to fill each jar three-fourths full to a boil in a pot, with adult supervision.
6. Add 1 tablespoon (Tbsp.) of borax to the water, and stir until it dissolves. Repeat, 1 Tbsp. at a
time, until no more borax will dissolve. This is your saturated solution.
7. With an adult's help, pour equal amounts of the saturated solution into the three jars. The jars
8. Lay a pencil across the top of each jar so the strings hang down into the saturated solution.
9. Cover the jars with plastic wrap, wax paper, or aluminum foil.
10. Place one jar in the refrigerator, leave one undisturbed on a countertop or table at room
temperature, and put one in the ice bath you prepared.
11. Leave the jars alone for a minimum of 5 hours, or until crystals form (whichever is longer),
and be sure not to disturb them. Check the ice bath regularly to make sure that the ice has not
1.      If crystals form under one condition before they do in the others, note that in your lab
notebook and let all three conditions continue for another hour to see if any crystals form in the
other conditions.
2.      Record in your lab notebook the total amount of time (from step 9 to step 11) that you
let the crystals form.
12. Carefully remove the pencils, one at a time, and note the size, shape, and number of crystals
obtained from each solution. Are there any differences? Why do you think this is so? Record your
observations in a data table, like the one below.
13. If you are presenting your project in a science fair, save the strings and display them at the
fair. Be sure to keep track of which string belongs with which solution.
14. Repeat steps 1–13 at least two more times to make sure that your results are accurate and

\

PAGE 2 OF 2                                                     DURATION: TWO CLASSROOM PERIODS

```
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
 views: 119 posted: 9/17/2012 language: English pages: 2