Toxins: Solution Concentration

For the first lesson of Chapter 15, students were immersed in the vocabulary of solution concentration.  The Lesson 80 PowerPoint includes five important vocabulary words that students recorded in their lab notebooks.  They then were shown gummy bears that had been placed overnight in either water, 0.1 M sugar, 1.0 M sugar, 2.0 M sugar, or honey.  The gummy bears were rinsed and the mass was measured.  The results are pictured below:


Students briefly thought about why the gummy bears changed mass and used the data and their thinking to complete Part 2 of the Lesson 80 Worksheet.  Students then transitioned to lab stations, working in groups to complete part 1 of the worksheet.  Most groups had time to finish either the sugar or the salt portion of the lab before we reconvened as a group to share results.  While students were settling in, they were treated to a chemistry video showing what happens when a bit of salt is added to a supersaturated salt solution.

Results from the lab are shown below.  Students should calculate the final column as homework.

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Evolution: Zombie Parasites

After a thorough examination of the process of evolution, it is time to apply our learning!  We will begin with a PowerPoint to briefly discuss the concept of infectious organisms, with an emphasis on thinking about how the co-evolution of organisms has resulted in complex relationships between organisms.  Students will define the vocabulary terms of host, bacteria, virus, parasite, and infection.  Next, we will watch a National Geographic video about zombie parasites.  The presenter, Anand Varma, applies his expertise in photography to the study of parasites.  Mr. Varma travels the world collecting specimen for study, and his ability to apply biological concepts to his work, think creatively, and drive to overcome failure make him and his work truly remarkable.