Pepper in Water

Written by: Casey Rogers (ChemDemo) on June 14, 2011.

Water has a very high surface tension because of the strong hydrogen bonding between water molecules, which allows the pepper to float on top of the water. When a small amount of soap is added it forms a monolayer on the surface. The monolayer spreads away from the point of contact causing the pepper to move to the edges of the dish.

Mushroom Cloud

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Written by: Casey Rogers (ChemDemo) on June 14, 2011.

When dry ice is placed in warm water it sublimes very quickly forming a large amount of carbon dioxide gas. When a bubble is placed over this the bubble grows from the pressure.