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# Growing Crystals

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by

## Jake Lefkowitz

on 6 February 2014

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#### Transcript of Growing Crystals

Growing Crystals
Conclusion
My hypothesis was correct. The crystals with the hottest water made the most crystals. Crystals form when the water and sugar evaporates. This tells me if the water and sugar solution are hotter than it will have more time to cool off causing more crystals to be formed.
Background
Perfect crystals are when all the atoms are in a perfect pattern
Background
Background
Crystals can be affected by many things such as temperature, pressure, amount of water, and amount of sugar.
Background
Crystals are usually a long body surface with a very sharp point
Variables
Independentent vairble:
The temperature of the water
Procedure
1. Heat one cup of water to the desired temperature.

2. Mix in 2 cups of sugar.

3. Stir for 5 minutes to dissolve the sugar and water.

5. Let crystals sit for 10 days.

6. Messure the weight of crystals in grams.

7. Record data in notebook.

8. Repeat for each temperature four times.

Materials
16 glass jars
two cups of sugar for each soulution
a pan
string
notebook
16 paperclips
16 straws
one cup of water for each solution
a scale

Aim
I want to see if the temperature of water effects the amount of crystals formed.
Hypothesis
I think if the temperature of the water is higher, the amount of crystals grown will be greater. I think this because crystals are formed when water cools and if its hotter then the water will cool for a longer period of time.
By Jake Lefkowitz
Dependent variable:
Weight of crystal growth
Control:
Amount of water and sugar
Diagram
Analysis
Thank you for watching
Results
Pictures
38 C
43 C
100 C

49 C
Results
Crystals come in all different shapes and sizes
Crystals form when water evaporates
My means were 1.78 grams for the 38 C which was the lowest temperature of water. My mean was 4.30 g for the 43 C. For the 49 C the mean was 8.53 g and for the 100 C water my mean was 17.86 g
My medians were
38 C: 4.11
43 C: 6.60
49 C: 11.06
100 C: 19.77
I did not have any modes
I had one outlier for the 100 degrees C crystals on trial 3 with 19.87 g
Crystals form and build on one another when recrystallization occures.
Recrystallization is when excess soulution evaporates from the water.
I had a 903% change from the crystals that grew at 38 degrees C to the crystals that grew at 100 degrees C

Predictions:
110 C 22.9766 g
120 C 25.3566 g
130 C 27.7366 g
140 C 30.1166 g
The slope is .238 which means for every 1 degree Celsius increase in temperature you will get .238 g more of crystal.
I had to repeat my experiment because the first time I used chop sticks instead of string to grow my crystals
Full transcript