Construct models and simulations to describe and explain natural phenomena. Recognize the personal relevance of science in daily life. Students will form hypotheses and observe demonstrations of particle movement. Students will identify variables and describe relationships in simulations of particle movement. Using a pipette, drop one or two drops of extract deep into a balloon.
Students blow up and tie balloons and set on desks for constant observation.
Do this at the beginning of a class period and move on to other activities while students are silently observing. Students time how long it takes to notice a change in odor around them. Within 5-10 min. Discussion and hypotheses follow. Visit the Utah State 7th Grade Integrated Science Core Curriculum Page .