Properties of Matter
In Investigation One, students will begin their study of properties of matter by exploring water as a solid, liquid, and gas. Students will observe the physical properties of each state. By doing this, students will discover that there are common and unique properties for each state of matter. Students will also explore changes in states of matter.
In Investigation Two, students will continue their exploration of the properties of matter. Students will compare the volumes of various solids and water. Students will compare volumes of different shapes. Students will practice estimation and prediction and then test their ideas. They will also observe water displacement and calculate the volumes of certain objects.
Investigation Three introduces students to the concept of density and provides them with the opportunity to make and test predictions about whether objects will float or sink in water. Students will also observe that the density of a substance can change when the substance changes states.
In Investigation Four, students will compare the weights of different objects. Using the information they have gathered about weight, they will predict and test whether those objects will float or sink. Students will also find the densities of those objects compared to water. Students will come to understand that weight per se does not determine whether an object floats or sinks and that weight and density relative to water cannot necessarily be equated.
In Investigation Five, students continue their exploration of properties of matter. This investigation introduces students to the concept of buoyancy through a series of experiments. Students will alter the shape of an object and change the contents of a container to change buoyancy. Students will understand that buoyancy is a unique property of a substance that is related to the composition of an object.