gator science

active adventures in lower school science

Hot and Cold

on November 25, 2013

4th grade chemists were working hard in the science lab today.   We investigated the solubility of a solute (salt) when mixing it water that was cold, hot, and room temperature.   We found that cold water held the least amount of salt at around 2 teaspoons, while warm water held the most amount of salt at around 6 teaspoons.  The water molecules expand when heat energy is added to the water, so more room is available in between the molecules for salt to fit.  One student asked a great question today in class.  What would happen if we cooled the hot water that had so much salt dissolved in the solution?  Students figured out that less salt would fit between the molecules, so some salt would fall to the bottom of the beaker as a precipitate.

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