Crystal Garden

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Standards addressed: 3.c Students understand atoms and molecules form solids by building up repeating fads, such as the crystal structure of NaCl or long-chain polymers. 9.a Plan and also conduct a clinical investigation to test a hypothesis

Independent variable

Time

Dependent variables

Crystal Height as a role of temperature

Controls

Crystals grvery own at room temperature (avr. Temp.= 23 C)

Series

Crystal expansion in cold temperatur (5 C).

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Crystal expansion in heat temperature (41 C)

Materials

3 Sponges

1/4 cup Uniodized Salt

1/4 cup Distilled H20

1/4 Mrs. Stewart Bluing agent (laundry whitener)

2 Tbsp. Ammonia

Food coloring

Glass pie plates (3)

3 Thermometers

Procedures

Arrange the sponges in the pie plates, cutting them in appr. 1" pieces. Combine salt, water, buing agent and ammonia in a bowl and mix well. Pour the mixture over the sponges, and also spoon staying thick mixture over each plate.

Sprinkle drops of food coloring (using different colors will allow for more colorful crystals).

Place each pie plate in cold environment (refrigerator), heat environmnet (hot plate) and also normal temperature atmosphere respectively. Ensure continued temperature control by placing a thermometer close to each plate. Make sure areas are quiet and complimentary of vibrations.

Record hourly alters (elevation of crystals)


Crystal Growth

Time
Height Temp.


The table supplied to record data must contain the independent variable (time) and the depedent variable. In addition, the temperature have the right to additionally be tape-recorded to ascertain eco-friendly conditions are maintained. Although temperature dimensions need to be taken several times throughout each day, they deserve to be averaged to everyday temp. readings.

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Crystal Growth Warm T. Time (hr)
Height (mm) Temp. (C)
0 0 41
2 4
4 7
6 10
8 13

This is the table representing the data accumulated from the heat temperature sample. To make certain the salt crystals had sufficient time to construct, the data was videotaped at 2 hrs intervals. Clat an early stage, the sample preserved at warm temperature was the a lot of plentiful and also fastest growing one. The table mirrors a remarkably comparable pattern of expansion at each time interval. The warm temp. crystals prospered appr. 3 mm eexceptionally two hours, and mainained that expansion througwarm the size of the experiment.


Crystal Growth Control Time (hr)
Height (mm) Temp (C)
0 0 23
2 0.5
4 2
6 4
8 5
16 5