Answer:
1. The particles of salt become so small, they spread evenly throughout the water. This clear mixture of salt and water will not separate by itself. It is a solution. A solution is a mixture of one substance dissolved evenly throughout another.
2. Like any bubble, the air rises to the top of the water and goes into the air above, clearing up the water. Cloudy water, also known as white water, is caused by air bubbles in the water.
3. The particles in a grain of sand are packed together very tightly. The sand is more dense than water. Therefore, the sand settles to the bottom of a glass of water.
4. Some solids change when mixed with water; others do not. Some solids dissolve in water; evaporation leaves the solid behind. Some liquids mix with water; other liquids form a layer above or below water. Observe properties of solid particles in different containers.
