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Lesson 5.6
Key Concepts
SummaryStudents revisit the dissolving M&M activity from Lesson 4. They will design an experiment to see if temperature affects the amount of dissolving of the sugar coating of an M&M. ObjectiveStudents will be able to identify and control variables to design an experiment to see whether the temperature of a solvent affects the speed at which a solute dissolves. Students will be able to explain, on the molecular level, why increasing temperature increases the rate of dissolving. EvaluationDownload the student activity sheet, and distribute one per student when specified in the activity. The activity sheet will serve as the “Evaluate” component of each 5-E lesson plan. SafetyBe sure you and the students wear properly fitting goggles. Warn students not to eat the M&M’s. Materials for Each Group
Materials for the Demonstration
Which of the following will not dissolve the water salt sugar chalk powder?Sugar does not dissolve in water.
Which of the following is not dissolve in water?Dirt mostly does not dissolve in water, unlike items like sugar and salt. Mud will not dissolve in water.
Is chalk dissolves in water or not?Chalk powder does not dissolve in water because it is insoluble in water.
Is sugar does not dissolve in water?Sugar dissolves in water because energy is given off when the slightly polar sucrose molecules form intermolecular bonds with the polar water molecules.
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