The positive and negative areas of the water attract the oppositely charged ions in the salt and pull them apart. Show the animation: Water Dissolving Salt. Explain to students that water molecules ...

Students then see an animation to help explain that the substances are ... Tell students that they will first compare how well salt and sugar dissolve in water. Then they will use their results to ...

Heat can help some substances dissolve faster in water. Salt, for example, will dissolve quicker in hot water than in cold water. When a substance dissolves, it might look like it has disappeared ...