Demonstrating that molecules of warm water moves faster than those of cold water.

You need two identical transparent containers. Put cold water in one container. Put the identical amount of warm water in the other. Place drops of food coloring in the cold water. Then put drops of food coloring in the warm.

Even with the addition of food coloring in the warm later than the cold water, you can witness the food coloring slowly dispersing in the cold water and quickly spreading in the warm water. This is a good demonstration.

Question: What causes the food coloring to spread through the water without stirring or shaking?
Answer: The movement of the water molecules

Question: Why does the food coloring mix faster in the warmer water?
Answer: The warmer the molecules are the faster they move. The quicker movement disperses the food coloring throughout faster.

Cat's Meow

1. Pour 20 mL of milk into a plastic petri dish.
2. Place 4 drops of food color in milk. Vary the location of each drop. Vary the color of each drop. Neon food color works well.
3. Dip a toothpick in dish washing liquid.
4. Touch surface of milk with detergent on toothpick. Do not stir.
5. The milk will swirl. You can see this with the movement of the food color. It is fast and amazing.

Soap has a fat loving end and a water loving end. This is how soap cleanses you. The fat loving end attaches to fat containing grime. The water loving end attaches to water and rinses off of you. The movement of the milk are the attraction of fat in the milk to the soap.

You can have students test the rate of activity with skim, low-fat, whole and half and half milk. Amazingly, the skim moves the quickest.