Freezing Point Depression & Boiling Point Elevation-ExploreLearning Simulation

Freezing Point Depression & Boiling Point Elevation-ExploreLearning Simulation

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Teacher Introduction: The Simulation –  Colligative Properties gizmo from Curriculum Applications: C30S-4-12: Explain Freezing Point Depression and Boiling Point Elevation at the  Molecular Level.  Examples: antifreeze, road salt. Introduction: The curriculum requires students to understand colligative properties at a conceptual level without actually coming being introduced to the term ‘colligative’. All students love snow days, when icy road conditions force schools to close. Road crews all over the country stock up on rock salt every winter to help melt the ice. The ice melts because the addition of salt particles lowers the freezing point of the ice. The freezing point of water is an example of a colligative property. The term "colligative" means "depending on the collection." All physical properties of a substance that depend on the number of solute particles dissolved in the substance are called colligative properties. These include boiling point, freezing point, vapor pressure and osmotic pressure. In this simulation exercise osmotic pressure is not considered. Colligative properties are dependent on the number of dissolved particles, not the identity of particles. As a result, compounds that dissociate into many particles in solution will have a greater effect on the colligative properties than those that do not. The Activity Students will be provided with a detailed worksheet consisting of step-by-step procedures  and questions to guide them through the simulations. This worksheet will ensure students  can work through the activity independently (although they will be encouraged to work  in pairs) and in a logical manner to ensure they understand the concepts addressed. Using  the worksheet, students are initially permitted to experiment at will with the systems’  variables. They then move through guided manipulations and record their observations  r
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on the worksheet and the data table within the simulation. Finally, they use the data they  have collected to develop an understanding of how freezing and boiling point are  influences by the introduction of and the nature of a solute. At the end of the activity, students return to the objectives laid out at the beginning of the  exercise and summarize what they have learned. Review questions complete the activity.  If students have successfully mastered the concepts presented in this activity, only a brief  formal lesson with note taking should be necessary.  Rationale A well-constructed simulation such as this is an appropriate educational strategy in this  situation because gas laws can be very difficult for students to comprehend. This  simulation allows students to actually see the solute and solvent particles, which are of  course undetectable to the naked eye in a lab situation. It is advised that the simulation be 
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Freezing Point Depression & Boiling Point Elevation-ExploreLearning Simulation

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