Crystal Garden

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requirements addressed: 3.c Students understand atoms and also molecules kind solids by structure up repeating patterns, such together the crystal framework of NaCl or long-chain polymers. 9.a Plan and also conduct a scientific examination to test a theory

Independent variable

Time

Dependent variables

Crystal height as a function of temperature

Controls

Crystals grown in ~ room temperature (avr. Temp.= 23 C)

Series

Crystal growth in cold temperatur (5 C).

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Crystal development 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 key (3)

3 Thermometers

actions

Arrange the sponges in the pie plates, cut them in appr. 1\" pieces. Combine salt, water, buing agent and ammonia in a bowl and mix well. To water the mixture end the sponges, and spoon continuing to be thick mixture end each plate.

Sprinkle autumn of food colour (using various colors will permit for much more colorful crystals).

Place each pie bowl in cold environment (refrigerator), warmth environmnet (hot plate) and normal temperature environment respectively. Ensure continued temperature control by placing a thermometer near each plate. Do sure locations are quiet and totally free of vibrations.

Record hourly alters (height that crystals)


Crystal development

Time
Height Temp.


The table used to document data need to contain the independent variable (time) and also the depedent variable. Additionally, the temperature can likewise be videotaped to assure environmental problems are maintained. Return temperature measurements should it is in taken numerous times throughout each day, they can be average to daily temp. Readings.

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Crystal development 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 enough time come develop, the data was videotaped at 2 hours intervals. Clearly, the sample kept at heat temperature was the most abundant and also fastest farming one. The table shows a remarkably similar pattern of development at every time interval. The warmth temp. Crystals grew appr. 3 mm every two hours, and mainained that development throughot the length of the experiment.


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