2.9 Communicating Discuss that two or more atoms may combine to form a molecule. Teacher s Manual I, III 2.10 Communicating Give examples of the gain or loss of energy as matter changes from one state to another. 48 Unit 16 Teacher s Manual I, III 2.11 Communicating Give examples of objects that expand when heated and contract when cooled. Expand Consider all activities for this lesson if time allows. Teacher s Manual I, III 2.12 Observing Compare and contrast mixtures and compounds.
Hypothesis Investigate how rust can be prevented or reduced.
Infer from findings what causes rust. Hypothesize about possible ways to prevent rust. Students will compare and contrast how plants and animals change over time in response to changing needs in the environment. 3.1 Observing, Classifying From making observations comparing roots, stems, and leaves, identify the importance of each plant. Observe plant parts to hypothesize how the functions of the plant parts enables them to live in certain environments.