With this activity students will observe and record the properties of various types of bar soap. They will discover that due to the ingredients some soaps are denser than others, and ivory soap will actually float. Students will see a model of an atom and a molecule, and act out how molecules behave as they are being heated. They will learn about Charles' Law which states that as the temperature of a gas increases, the volume increases as well. This law will be demonstrated by heating ivory soap in a microwave oven.