Reflections, this week:
Today, with students still recovering from their test last week, they worked in groups to begin researching body systems online. I noticed a big differentiation in skill between the fourth period class (which finished all of their work, some with time to spare) and the first period class (maybe one group finished all of their work). With the first group, it was a little more difficult to get them to go to better websites; it was too difficult for the work to be fun for them, in contrast to some of the students fourth period, who at least seemed engaged.
Also, I worked one-on-one with a student to make corrections on his test over second period. Although I wasn't going to give him any answers, I would still tell him when he was maybe missing something. He seemed fixated with some answers, even when I would tell him repeatedly, "No, that is not what she's looking for." That was definitely frustrating. I know I get fixated on things sometimes, where my mind goes in a loop, and I know that it's not fun being on the other side of the desk, either. It's tricky business, when the situation gets that frustrating, because I don't want to turn children off for life on science or imply that there is anyone out there who cannot do science.
Tuesday
At the high school, I took a lot of notes on waves in earth science, which I'm observing and is helping out a lot in my understanding what I will be teaching in physical applications of science. Also, I feel like I never learned earth science (I was really immature at the time), so I feel like now I can finally learn about where I live. It seems so obvious now that I should know these basic concepts, and I am glad I still have the luxury of being a student and observing others teach (both for the content and pedagogical knowledge I can gain from observation). Anyway, shame on me for being a bad student, and I think I will use both observing the class and the McGraw-Hill website (which seems very helpful and interactive, at first glance) to help me learn these basic concepts everyone who lives here (on earth) should know.
My students finished preparing their DNA game tonight, which we'll play on Thursday. Their exam (which covers the last few chapters in the book--basically, nucleic acids and metabolism) is not for another couple of weeks, so we will have more review activities in the spirit of having everyone see and explain the material in multiple ways. In particular, we are almost ready for the metabolism debate that's on the NSF website and is in the top 10 for things we do in this class (
http://sciencecases.lib.buffalo.edu/cs/files/origins_debate_adv.pdf). I am extremely excited for this debate--I will have to be sure I stay in teacher mode and monitor the debate and push students to apply their knowledge.
I added in more scaffolding for their final presentation (they always had check sheets to fill out throughout the semester, but I think my check sheets get a little more helpful each time), which they also worked on tonight and spoke with me about informally. I uselessly, foolishly used to schedule conferences on Blackboard to make them "official." The presentation is still a
big project, and I will have to keep thinking on ways with which to provide more scaffolding.
Also, there were some concepts that I over-dwelled on; I was trying to provide at least some direct instruction on protein synthesis, but I really beat a dead horse tonight (based on them being able to answer all of my questions and interpret the final HHMI video we watched). It's really difficult to walk that fine line of providing enough support vs. didactically lecturing, and it may have to do with my students' prior knowledge of biology and the extent that they have dedicated themselves to this class. I will have to learn to read my students better and/or give assessments more frequently.
Thursday:
Yes, titrations are more difficult at the high school level and require more prep work. I will ask the advanced chemistry teacher what her impressions are of how it goes, but in prepping these labs, a few key points are:
- weak acid/base chemistry may not be a good way for high school students (who haven't had Analysis yet) to collect meaningful, reliable data
- the effort of back-titrating the NaOH to standardize it needs to be weighted against the teacher's prep time
- students can be expected to use Vernier probes, litmus paper, pH meters--don't hold your expectations too low, either
- each part of a college level lab procedure can be used for one high school lab period (especially considering they don't have four hour slots in a row)
Besides peer reviewing each other's outlines for their final presentations and discussing editing and my expectations for their papers, I did some direct instruction on glycolysis to model what I think are the key features of a metabolic pathway. Then, I broke my students into pairs to create infographics on infogr.am (inspired by watching the earth science kids create their own, on volcanoes!) for the remaining pathways involving glucose that we are going to cover. It worked out well, because the kinds of questions that they asked me (which intermediates are important? what is the big picture?) were the kinds of judgment calls I wanted for them to make on their own--I gave them guiding questions, but some of the questions were more or less appropriate for different pathways. The good thing is that now everyone has each other's links (the infographics took 1 1/4 hour to make) on the pathways for future reference, everyone had to make judgment calls about what information was important and how to present it, and I did not just straight-boring lecture on each step of each pathway and how the enzymes were activated or regulated. This was also thanks to methods class on Tuesday, since we spent so much time on jigsaws.
Unfortunately, I realized that I really dropped the ball on energy the semester. My students ask a lot of questions that make me think that I did not help them build schemas for driving forces, enthalpy, reaction coordinates, etc. Now that we have gotten to metabolism, every time I talk about kcal/mol and the interchange between ATP and ADP, I realize more and more that we need to stop and just discuss energy. I think one of the reasons why I dropped the ball this semester is that I didn't incorporate Jmol at all; I think prior students' knowledge of energy was built in figuring out how to use the program (there was one lesson for that) and how to apply the program to demonstrating change in energy for different processes (there were several lessons for that).
It's a pity, because some students are almost done with their final presentation, and I know that they could have learned and synthesized knowledge a lot more, had they already had the background knowledge on energy and software to play with that concept more. So, in terms of what I really did wrong this semester, it was not emphasizing core concepts like energy, and what I have learned is that I really do my students a disservice if I realize that I've neglected important topics at the end of the semester. What this means is that I really need to be doing more formative assessments and getting to know my students conceptions/misconceptions much more frequently and earlier on. One way to do that would be to have my students blog more; that was a way last summer that I really got a sense of the thinking process and understanding of my students.
Also, one of the reasons why I just never got around to Jmol was that most of the other chemistry educators I know tend to not emphasize computations at this level; I think I was actually influenced by my friends in my lesson planning, even though they will never pop in and observe what I teach. That is really pointless (it's like peer pressure I made up in my head), so I REALLY need to back up my teaching decisions with research, the needs of my individual students of the term, and my own goals and objectives for teaching the core competencies (or, standards, once I get to the high school) for a specific class. I think this made-up peer pressure made me skip a few really useful lesson plans, and I will go back to incorporating Jmol next time I teach this class (it may be too late to start this semester--there is a lot of scaffolding and getting introduced to the mechanics involved).
Another thing that I dropped the ball on this semester was relating the first few chapters on organic chemistry to students' prior knowledge and interest. I realized sometime this semester that I actually like biochemistry better than organic chemistry (I feel like a traitor, but it just goes to show that you never know what your passions will actually be, whether it is the level of students you are teaching or your favorite subjects). In comparison to the enthusiasm I've shown my students in biochemistry, combined with my lack of connecting the new material to students' pre-existing "hooks," I really made organic chemistry sound esoteric and unmemorable. I am drawing a blank (writer's block?) right now on how to begin to remedy the situation.
One way to start would be to take a lot more student interest surveys at the beginning of the semester, to see what they actually find interesting. I could back off earlier on (I tend to provide more direct instruction at the beginning of the semester and taper off) and promote more student inquiry, KWL charts, and other student-centered learning. I could also introduce biochemistry earlier on and just teach the reactions that both the lab and our bodies have in common (removing H's, adding on H's, isomerizing) simultaneously. We could learn some of the material together. Everyone has heard of trans fats, so even if carbohydrates don't show up until later chapters, we could talk about the reaction for trans fats when we introduce alkenes. There are a few solutions I could try and implement; it's not that organic chemistry is hopelessly esoteric!
Finally, the Teaching and Learning Conference, which ends tomorrow, is very helpful so far. I got a lot of resources/websites/references for further information, but I also got a lot of immediate tips (like a longer cycle for the sticky note activity I did in methods I last semester) that I could implement next week. It was also really helpful to do Think-Pair-Shares with colleagues during the keynote speech on active learning strategies, especially since there were divergences in opinions (I learned that I find a lot of problems with flipped classrooms, and I learned why I find that model problematic from having to defend my position). Overall, very awesome. They threw out some new learning theories and theorists I hadn't heard of before, mainly dealing with andragogy (we do mainly teach adults), and there was one really good talk I went to on the need for research in the classroom (that is how society progresses; we need the data to influence policy) and how to get started with the process (the simplest example was to ask students to raise their hands if they know X, Y, or Z--differentiate your lesson based on that).
Blog on Safety:
List the safety features of the classroom and the building.
Adults who are not on the payroll must sign in and out of the office. Many of the doors leading to the outside are locked, which further prevents people getting in who may not belong in the school.
My local high school also locks the doors during the day. The tornado sirens were tested on Thursday (it still creeps me out, since they are on Wednesdays in Minnesota--I think the sirens are real, each and every month, and I've only been here for two years now), and there are periodic fire drills. The high school chemistry classroom is equipped for lab (I believe the biology room is equipped, too, but the equipment looks foreign to me), and there is one big lab room that all classes can share. They have all the normal safety features: locked stockroom where all of the chemicals are kept, fire extinguisher, fire blanket, eyewash at the front, hood, multiple doors in case everyone needs to exit at once, etc. All of the high school classrooms have maps on where to go in case of tornado or fire.
How are environmental hazards handled in the classroom? [middle school coming soon]
At the high school, the college picks up the really serious heavy metals. Acids and bases are neutralized and flushed down the drain. They minimize the use of strong oxidizers-reducers. They work with partners and typically work on microscale to minimize waste.
Obtain a copy of a policy dealing with safety for the science classroom. How do the teachers inventory, store, and access chemicals and equipment? [middle school coming soon]
So far, what I have noticed in the middle school is that my cooperating teacher has cabinets labeled with different laboratory equipment.
At the high school, everyone has the Google Drive Excel sheet of the inventory. Last summer, they updated their stock room and re-organized everything to a T, according to OSHA standards, with labels on all of the shelves. They have a great stockroom for a high school, including a ton of those Fisher pre-made labs and really helpful, memorable demos. Everything is locked up, but the teachers just need keys to get into the stockroom. In terms of policies, students sign a safety contract at the beginning of the trimester, before they are allowed in the lab.
What safety considerations were made for a lab you have observed? What safety features seem to be absent from the classroom?
At the middle school, I observed students making a model coal plant. A fire was lit to a hydrocarbon fuel source underneath a gauze, on which a container full of water had been placed. A paper pinwheel was pinned to a pencil and held above the water. When the water was turned to steam, this turned the pinwheel.
Safety considerations included that students light the fire carefully and avoid touching the fuel source or setting anything on fire. The pinwheel was pinned to a pencil so that students' hands would not be directly in the path of the steam. After students were done viewing the model, they let the fuel source cooled, and the adults handled any of the equipment that was extremely hot when cleaning up.
I have observed a ton of safety considerations at the high school. Students prepare before they do any lab work so, even if the investigation is inquiry based, students still know what they are going to do before they ever enter lab. Some of them will have done calculations beforehand and have an idea of the scale (I think they just do the math because they sense that they're supposed to and not because they want to get a feel for the scope of what they are doing). Students are good at wearing their goggles, tying up their hair, and not bringing their coats or book bags into the lab. This is unlike what I have seen with some of my grown-up students do (no one this semester, luckily!), and I think an advantage of working with younger students is that some of them will still just do what I tell them to do without questioning my reasoning.
Otherwise, as I said above, students will work on small scales, and the teachers are careful about how they collect waste (they might have one large beaker for acids, one for bases, etc.). Teachers review Bunsen burner and tong use before labs, and students are careful to not start anything on fire. If a lab calls for "blood" or "urine," they will use fake solutions that mimic the behavior of the real solutions. I know that the teachers are extremely vigilant about safety, and the students are well-informed and generally engaged with their investigations; there aren't any notable safety features missing.
If animals are in the classroom, how are these handled?
We are animal-free, across the board.
Stay tuned for more!!