This lesson (2.2) is the second lesson in Chapter 2: Changes of State from Middle School Chemistry produced by ACS.
The lesson, which is outlined comprehensively in the lesson plan, follows the BSCS 5E Instructional Model. The “engage” phase begins with a series of questions as a way of helping students design an experiment to see if the the temperature of a small sample of water on a paper towel will affect the rate of evaporation. A well described experiment follows in the “explore” phase. In the “ Explain” phase a simulation that illustrates water molecules at different temperature and their effect on the rate of escaping the liquid phase is introduced to explain the observations in the experiment.
The particles of water are illustrated using both the ball and stick and the space-filling models.
The website includes downloadable pdf documents for the lesson plans, the entire chapter, student activity sheets, the answer sheet for the activity sheet, and a student reader to be used at the end of the lesson.