Investigating Temperature Changes on Evaporating Liquids—Microscale Chemistry

This Investigating Temperature Changes on Evaporating Liquids—Microscale Chemistry lab resource also includes:

Is there more to evaporation than just less liquid? Show young scientists the energy transformation that occurs during a phase change through a series of simple experiments. Lab partners place drops of water, ethanol, and ethoxyethane on a strip thermometer, then observe and record temperature changes.

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CCSS: Adaptable
NGSS: Adaptable
Instructional Ideas

  • Present the structures of the three chemicals, then ask the class to make predictions about what they expect to observe in the experiment
  • Create a discussion around the question posed at the end of the lab to link learning to a real-world situation
Classroom Considerations

  • Have learners time the temperature changes to gain insight into the rate of the phase changes
  • Ensure middle schoolers have an understanding of intermolecular forces before doing the lab
Pros

  • The experiment is written clearly and is easy to execute
  • Observations students make are impactful and illustrate several important concepts at one time
Cons

  • None