Fifth graders, in groups, complete an experiment/activity in which they dissolve salt in a cup of hot water and then observe what happens as the water evaporates over the next few weeks.
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Changing the Density of a Liquid - Adding Salt
Fourth in a set of several little lessons on density, this one compares the density of fresh and salt water. First by demonstration, and then by a hands-on activity, learners find that adding salt increases the density, as is evidenced...
3rd - 8th Science