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Explain that water is made up of tiny particles, called molecules, which are too small to see. These particles are always moving, even in very cold water. Since water molecules move, the molecules help mix the food coloring. However, the color mixed faster in the hot water than it did in the cold.
Explain the activity of water as a solvent. Water is a polar molecule. When water dissolves ions, the partial negative charge of oxygen attracts positive ions and the partial positive charge on the hydrogen attracts negative ions. Most ions are dissolved because of waterâs ability to act as a solvent, as are proteins and other solutes. 9.