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Have you ever wondered what is the theoretically largest possible value for the atomic number of an element? Using some introductory physics and algebra, you can get your students thinking about this idea.
This year my students experienced something a little new to them on the Chemistry Olympiad. It was a question about the crystal structure of a mineral. I have not been teaching the “unit cell” concept in great detail and started to reevaluate my unit on liquids and solids. This question has been appearing on the semifinal exam of the Chemistry Olympiad for a few years but not the local exam until this year. I actually like it when something like this happens. It allows me to reevaluate what I am teaching in class, provides me an opportunity to learn new things, and brings new material into my curriculum.
As a new semester begins, I am excited again. Starting fresh, introducing new people to the amazing world of chemistry, and putting my newly edited labs to the test! In addition, another instructor is trying my labs.
I have always struggled teaching the concept of bonding. What is a chemical bond? Is it just covalent or ionic? What about hydrogen bonds? Are those real bonds or just attractive forces pretending to be bonds? If they are not official bonds, what do we call them? How about intermolecular forces? How are those different from salt crystals that attract to other salt crystals but are called ionic bonds? How about "electronegativity"? If there is a metal nonmetal compound but it is just shy of the "cut off" for the difference between polar covalent and ionic, what type of bond is it? Essentially, as I got confused over the years, this translated into confused students and rushing on to get to the next unit in an attempt to cut my losses.
My first big project my students engaged in during the 2013-14 school year was, at best, a mediocre experience and, at worst, a giant waste of valuable instructional time we'd never get back.
I just completed covering "ionic and covalent" bonding with my studenets. I wanted to bridge the gap to intermolecular forces. I found a great lab called "Sticky Water" from Target Inquiry - Grand Valley State.(link is external) Before I continue, I have to provide "full disclosure". I spent three years with the Target Inquiry Program at Miami University Ohio (Project TIMU(link is external)). There is a lab called "Sticky Water" that was written by a teacher in the Grand Valley State program. First, the activity focuses on just water, then ethane, then ethanol.
We just finished an introduction into ionic and covalent bonding. Somehow I wanted to try to figure out what they did or did not take away from the experience but because we just finished semester exams, I did not want to do another test or quiz. Instead, I tried a "card sort".
I run an after school STEM club that involves many projects and activities. Students build robots for FIRST Robotics, race RC cars, use 3D printers, and build underwater vehicles. They dissect specimens, and create biodiesel from vegetable oil. So why would I bring this up on the Chemed Xchange? Our science club does chemistry activities, we are an ACS Chem Clubs, but I think there are many other benefits to this kind of club.
This year our school, through a unique set of circumstances, had final exams before winter break, two weeks of break and then one week left in the semester after break before second semester officially ends. It is a weird situation. We were in the middle of gas laws and now have to pick up where we left off after the kids have not been attending school for two weeks.
Last winter I watched a webinar put on by ACS and AACT called "NGSS in the Chemistry Classroom." As a result of watching that webinar, I took an activity that had NGSS Science & Engineering Practices (SEP) integrated into it and tried it out in class. In this activity, students are required to develop their own procedures and data tables.