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In this activity, learners build models of atoms and molecules, then consider their role in different phases of matter, density, and mixtures and solutions.

In this activity, learners create a gelatinous slime using guar gum powder and borax. Educators can use this simple activity to introduce learners to colloids.

In this activity, learners will discover why there are holes in bread.

In this activity about water solubility and density, learners use critical thinking skills to determine why water can dissolve some things and not others.