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Researched by Alicia F. 2000-01 |
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The purpose of this experiment was to see if different
temperatures affect the growth rate of crystals. I became interested in
this idea because I saw a television show about crystals and
wondered if temperature affected the growth rate of a
crystal’s mass.
The information gained from this experiment can help
society by showing different temperatures can affect the growth rate of
different types of matter, which would help computer chip manufacturers
make computer chips faster and more efficiently.
My hypothesis is that crystals will have a faster growth
rate if the temperature is lowered to 4.4 degrees C. than 22.2 degrees
C. or 25.0 degrees C.
I base my hypothesis on research collected by a crystal
specialist, Jean Stangle states that if the temperature is lowered the
experiment will produce the largest crystal.
The constants in this study were:
The same temperature of the hot tap water
The same amount of washing soda 60 table spoons
Make the same type of crystals
Wait the same amount of time to check each experiment
Use the same size of jar lid to hold the crystal formation
The same amount of trials
The same size of towel strips 2.5 centimeters wide and 46 centimeters long
The same size of jars to hold the solution
The manipulated variable was to vary the temperatures
of the situation that crystals grew in. The responding variable was that
the crystal’s weight varied according to the different temperatures. To
measure the responding variable I will measure the weight of the crystals
on the jar lid in grams.
| Quanity | Item description |
| 12 | 1 pint jars |
| 6 | jar lids |
| 1 | marker |
| 6 | 2.5x46 cm strip of old towel |
| 1 | triple beam balance |
| 1 | mL measuring cup |
| 1 | refrigerator |
| 1 | measuring talble spoon |
| 2 | trouble lights |
| 1 | stirring spoon |
| 450 grams | washing soda |
| Some | hot tap water |
| 1 | roll of masking tape |
| 1 | cm.ruler |
| 2 | 100 watt light bulbs |
Preparation of Materials
1. Rinse the jars with warm tap water.
2. Cut six pieces of tape about 6-8 centimeters long.
3. Take the marker and label two jars "Refrigerator Group
1-2".
4. Label two jars "Control Group 1-2."
5. Label two jars "Heated Group 1-2."
6. Screw two 100-watt light bulbs into the trouble lights.
7. Set the trouble lights apart from each other about
60 centimeters.
8. Cut six 2.5 x 46 centimeters strips of towel.
Conducting the Experiment
1. Measure 325 mL of hot tap water.
2. Add the tap water to one jar.
3. Put 5 tablespoons of washing soda into one jar.
4. Stir the washing soda until saturat1, 2, 3,&4.
5. Separate the labeled jars.
6. Add one jar to the groups of separated jars.
7. Make sure that only one labeled jar is in each group.
8. Make sure that there are only two jars in each group.
9. Set the "Control Group" jars 14 centimeters away from
each other.
10. Drop one end of a towel strip into both jars of the
"Control Group"
11. Crease the towel in the center.
12. Set a jar lid below the creased part of the towel.
13. Repeat steps 10,11,12&13 but with the jars labeled
"Heated and Refrigerated groups"
14. Put the two refrigerated groups in the refrigerator
14 centimeters apart.
15. Place the Heated Group 14 centimeters apart from
each other.
16. Place the trouble lights 10 centimeters away from
the "Heated Groups".
17. Wait about 24 hours.
To Record Data
1. Set the jar lid on the triple beam balance.
2. Record the data onto your experiment log.
3. Repeat step 1&2 until all lids are measured.
The original purpose of this experiment was to determine if different temperatures affect the growth rate of crystals. The results of this experiment were that the average of the heated groups was 34.35 grams, the average of the control group was 61.85, and the average of the refrigerated group was 53.9 grams.
My hypothesis that crystals will have a faster growth rate if the temperature is lowered to 4.4° C. than 22.2° C. or 25.0°C.
Because of the results of this experiment, I wonder if the amount of light affects the growth rate of crystals.
If I were to conduct this project again I would use hotter
water to saturate the washing soda better. For the heated group I would
use a 150 watt light bulb in the trouble lights. I would have lowered the
temperature of the refrigerator. I would have done more experiments. I
would have used a more accurate way of measuring data. I would take more
descriptive notes in my project log.
ACKNOWLEDGMENTS
I would like
to thank the following people for the help with my science project.
I would like to thank the following people for helping
me make my science project possible.
First I would like to thank Mr. Newkirk for helping me to learn how to do most of the activities in the science project. He also let me stay after school to work on my graphs and type my information down. He also helped very much on learning about how the display, and where every thing goes.
I would like to thank both of my parents for helping me to get the supplies. My dad, got me the rubber cement and some other supplies. My mom, helped me decide on some of my display whether it was straight or not and whether if I should redo it.
I would like to thank Mrs. Hostetler for helping me decide on many things. Especially taking me to the computer lab to type my information. She also helped me edit and correct the hypothesis, purpose, abstract, experiment design, report, results and conclusion.
Last I would like to thank Mrs.Paskvale for helping me on the computers when I had a problem.
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