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Relate the rates of evaporation of three liquids to the degree of intermolecular bonding within the liquid.
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Intermolecular Forces Lab Purpose: The purpose of this lab is to relate the rates of evaporation of three liquids to the degree of intermolecular bonding within the liquid. Method and Materials: Refer to sheet. Observations: Substance T Initial T Final ?T Evap. Rate Methanol 21.4 6.3 15.1 fast Ethanol 23.5 14.7 8.8 medium Acetone 25.4 7.9 17.5 fast Water 23.8 16.9 6.9 slow Isopropyl Alcohol 26 17.5 8.5 medium Glycerine 24.3 20.3 4 slow Analysis: Vapor pressure is the pressure of a liquid that evaporates into a gas. If the molecules were in a closed container, the vapor pressure could be measured by the force of the molecules acting on the boundaries. When the molecules have more energy in them, they would release it with greater kinetic movement resulting in a greater impact when colliding into the boundaries. Thus, this would increase their vapor pressure. Similarly, when molecules evaporate into an open space at a fast rate, they have higher vapor pressure because they have more energy. This is because they've absorbed the most heat from their surroundings so they have the greatest kinetic energy, and require more...
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