Crystal Garden

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

Independent change

Time

Dependent variables

Crystal elevation as a duty of temperature

Controls

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

Series

Crystal development in cold temperatur (5 C).

You are watching: Do crystals grow better in warm or cold temperatures

Crystal expansion in warmth temperature (41 C)

Materials

3 Sponges

1/4 cup Uniodized Salt

1/4 cup Distilled H20

1/4 Mrs. Stewart Bluing certified dealer (laundry whitener)

2 Tbsp. Ammonia

Food coloring

Glass pie plates (3)

3 Thermometers

steps

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

Sprinkle drops of food color (using various colors will enable for more colorful crystals).

Place each pie bowl in cold environment (refrigerator), warmth environmnet (hot plate) and normal temperature atmosphere respectively. Ensure ongoing temperature regulate by placing a thermometer close to each plate. Do sure areas are quiet and cost-free of vibrations.

Record hourly transforms (height of crystals)


Crystal development

Time		 Height Temp.


The table supplied to record data must contain the independent variable (time) and also the depedent variable. Additionally, the temperature can also be videotaped to assure environmental conditions are maintained. Return temperature measurements should it is in taken several times throughout each day, they deserve to be average to day-to-day 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 gathered from the warm temperature sample. To make sure the salt crystals had sufficient time come develop, the data was recorded at 2 hrs intervals. Clearly, the sample preserved at warm temperature was the most abundant and also fastest cultivation one. The table shows a remarkably comparable pattern of growth at each time interval. The heat temp. Crystals flourished appr. 3 mm every 2 hours, and mainained that expansion throughot the size of the experiment.


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