standards addressed: 3.c Students understand atoms and molecules kind solids by building up repeating patterns, such as the crystal structure of NaCl or long-chain polymers. 9.a Plan and conduct a scientific examination to test a hypothesis
Crystal height as a function of temperature
Crystals grown in ~ room temperature (avr. Temp.= 23 C)
Crystal growth in cold temperatur (5 C).
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Crystal expansion in warmth temperature (41 C)
1/4 cup Uniodized Salt
1/4 cup Distilled H20
1/4 Mrs. Stewart Bluing certified dealer (laundry whitener)
2 Tbsp. Ammonia
Glass pie bowl (3)
Arrange the sponges in the pie plates, cut them in appr. 1" pieces. Combine salt, water, buing agent and ammonia in a bowl and also mix well. To water the mixture end the sponges, and also spoon staying thick mixture end each plate.
Sprinkle drops of food coloring (using various colors will permit for an ext colorful crystals).
Place each pie plate in cold setting (refrigerator), heat environmnet (hot plate) and normal temperature setting respectively. Ensure ongoing temperature control by place a thermometer near each plate. Do sure areas are quiet and cost-free of vibrations.
Record hourly transforms (height the crystals)
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|Height (mm)||Temp. (C)|
This is the table representing the data accumulated from the warm temperature sample. To make sure the salt crystals had enough time to develop, the data was tape-recorded at 2 hrs intervals. Clearly, the sample kept at warm temperature to be the many abundant and also fastest growing one. The table mirrors a remarkably comparable pattern of expansion at each time interval. The warm temp. Crystals flourished appr. 3 mm every 2 hours, and mainained that growth throughot the size of the experiment.
|Height (mm)||Temp (C)|