One beaker is at room temperature, one beaker is set on a magnetic stirrer, and the third beaker of water has been heated on a hot plate. Equal amounts of food coloring will be added to each beaker. Students are asked to hypothesize the amount of time it will take for the coloring to become evenly and completely diffused in each beaker. Students time each beaker, record findings, discuss results, and state the conclusions. See how this relates to cell transportation processes.
Teacher stands at back of class with students facing forward.
Students are asked to not turn their heads and to raise a hand if they sense something different in the room. Teacher quietly sprays perfume or Pine-Sol, or opens a container of ammonia, or lights a match and burns paper. As the particles move from the area of higher concentration to areas of lesser concentration, the students should be able to sense the substance and raise their hand. Before the particles have reached the front of the room, the teacher asks students to look around, observe the room and those hands that are raised. Shortly thereafter all students should be able to smell the selected substance.