Students bring samples to school and observe and list the properties of each as a class. Students see if they can find a substance that can behave as a solid and liquid, or as a solid, liquid, and gas. Students investigate water to show that it can be a solid, liquid, or gas and can be made to go from one state to another. The teacher encourages students to provide reasons and hypotheses for what is happening, leading into a discussion of energy transfer. The teacher accepts all plausible explanations, encouraging students to record as many observations as possible.
Students hypothesize, observe, and record which ice cube melts first, second, third, and fourth.
They demonstrate their scientific skills and processes by performing simple tests, recording observations from demonstrations, and making predictions. The teacher looks for evidence that students considered the type of container used in the experiment when they developed a classification system. These resources are those that have been evaluated since 1992. A complete list of resources to support this organizer can be found in Appendix B . For complete product descriptions, and ordering information, please refer to the Science Annotations booklet.