What causes frost to form on the outside of a cold container? In this activity, students will see that the liquid water can change state again and freeze to become ice.

An explanation about the process of evaporation and the conditions needed to complete this process.

A comprehensive lesson plan site that contains a number of activities to aid in teaching about the states and properties of matter and the difference between a physical and chemical change.

This site provides a lesson plan using candy making to demonstrate physical and chemical changes in matter. Includes directions to make caramel and rock candy.

Observe the changes in the states of matter and volume when a balloon-covered flask with water in it is heated.

Our pipes leak, air drafts push through our windows and walls, light bulbs create more heat than light, and every appliance we have stays plugged in all day long. Of course its our parents who pay the bills, so it doesn't matter. This is...