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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ
Chemistry, Earth & Space, and Materials Science teacher. Boys' Ultimate coach. Science Olympiad coach. Insomniac. Oregon HS in Oregon, WI. He/him/his.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Sep 11
Replying to @aserkin
I think that the black-boxness of some modern equipment can lead to students not conceptualizing measurements...but I have no qualms about just using electronic balances as weight is just so tangible.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 14
Replying to @pcaginalp @jen_chem101
We're keeping the Bohr model among our "past, incorrect" models of the atom, but trying to do better about not having it beyond that and only use the modern quantum wave model once we pass over Bohr as an incorrect model.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 14
Replying to @pcaginalp @jen_chem101
Student get stuck on the idea of electrons as particles as finite points rather than space-filling waves. Last thing we want to do is introduce sticky misconceptions.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 13
So in going over our periodic table unit today, we realized we have to pull the Bohr model from our trendy periodic table POGIL (and replace it with electron wave model). He refuses to roll over and play dead!
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 9
For the POGIL, we're adapting our already tweaked version of the POGIL: Electron Energy and Light to be about connecting H's bright line spectrum to quantum wave model rather than Bohr.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 9
It's shaping up for this year for the quantum lessons to likely be pretty lecture heavy for our first attempt. As it stands, it looks like 3 days of lecture/demo then a POGIL then another lecture day to transition to e- configs. Flame test lab will prob be a break day somewhere.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 9
As we were merrily reworking our atom unit this week... all this happened.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 8
Replying to @ohsjohnson
3/3 We also require our students to read every question out loud to their group, discuss as a group, reach a consensus, and then they can start writing. (Rather than their urge to all read and write on their own then compare answers). Not all groups comply, but it sets a tone.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 8
Replying to @ohsjohnson
2/3 teacher check-in (and teacher has to initial their papers when satisfied), spokesperson checking in with another group in a structured way, quality control checking setting with an answer key, and a number of other things.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 8
Replying to @MrJKeown
1/3 We do a number of things to Foster a collaborative learning environment for POGILs. We have role cards so each member of the group has a specific role and duties that day. We have a variety of stop signs written into our POGILs, things like
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 4
One of the biggest perils of writing your own curriculum into a pre-bound notebook: not being allowed to procrastinate on fixes. I just have to keep reminding myself how much I love our Earth & Space course.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 1
Replying to @jensenchem
There's definitely a lot of levels it can be handled at. Just getting in simple fission and fusion ideas could be fairly easy.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Aug 1
Replying to @jensenchem
We do a whole unit on nuclear in our gen chem.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Jul 26
After this conference, we're looking at skipping Bohr and going to using a simplified description of quantum mechanics to underpin the quantum numbers (incl spdf). We'll still use light spectra, but instead of using quantum jumps via Bohr, we'll go right to wave model resonance.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Jul 25
One of the biggest challenges is that the way we treat electrons at the pre-university level is setting up misconceptions that are turning out to stick with a few too many students when they finally are faced with a more correct model.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Jul 25
In terms of EM wave interactions with electrons, this fits then with the quantization of light emitted or absorbed because only light that is resonant with the waveform of the electron will then change its vibrational mode.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Jul 25
I'll admit I'm still wrestling with all of this, but my understanding as of right now is that the lower mass of the electron means that its quantum excitation is more spread (as represented by the orbital). The nucleus has enough mass that its wave function occupies less space.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Jul 25
Yes, the word particle is indeed a convenient conceptualization of the excitation of quantum fields. The challenge arises when addressing the fact that these excitations are not singular points in space, and how classical treatment of particles can lead to misconceptions.
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ Jul 24
Did you join the FB group?
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Nathan Johnson ๐Ÿณ๏ธโ€๐ŸŒˆ๐Ÿ‘จโ€๐Ÿซ๐Ÿงช๐Ÿ”ญ๐Ÿฅ retweeted
John O'Donoghue Jul 24
Amazing talk by Binyomin Abrams at : Of Bohr, Schrodinger, Heisenberg: โ€œif an electron is a grapefruit and measurement is a sledge hammer, these guys walked into a room full of grapefruit carcasses and figured out what a grapefruit was!โ€
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