Learn a simple and very inexpensive way to build and use an "absorption spectrometer" using a smartphone. This is a great way to implement Beer's Law experiments in your classroom!
We are encouraged to use modelling these days and I have some activities to share along with some videos that might help you in the process.
Have you ever seen the soap boat experiment? Check out the video.
This is a series of experiments, PhET Interactive Simulation activities, and clicker questions to relate macroscopic and molecular representations of homogenenous solutions. Graphing skills are also used.