This Investigating Temperature Changes on Evaporating Liquids—Microscale Chemistry worksheet 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.
- 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
- 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
- The experiment is written clearly and is easy to execute
- Observations students make are impactful and illustrate several important concepts at one time