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Use this inquiry lab to intro single displacement reactions
Sometimes it just all works out right. The timing of the lessons and the timing of a lab. This year, I introduced a simple new lab...
Brennan Koch
Jan 24, 20254 min read


5 Traps in naming compounds and how to avoid them
Chemistry can feel dangerous to a student. There are so many pitfalls that you and I so easily avoid, and yet the students repeatedly...
Brennan Koch
Jan 17, 20254 min read


Try this progression to teach ionic formulas
Progressions are important. If I dove straight into a max effort weight training and health kick, I would get disappointed in the...
Brennan Koch
Jan 10, 20255 min read


Do kids pay attention in lab? Use a lab final. Here is mine from 2024
Something wonderful happened yesterday. My room was full at lunch. I mean really full. And all of them were helping each other to...
Brennan Koch
Dec 13, 20244 min read


Building in buy-in to chemistry
Something beautiful happened in the last test of the semester. Less kids failed. I mean a lot less. And it wasn’t an easy test. In...
Brennan Koch
Dec 6, 20243 min read


How to go down the rabbit hole but not waste time
We are teachers. We like to know that we know stuff. Kids think that we know stuff. If you wear your lab coat out of the room,...
Brennan Koch
Nov 22, 20245 min read


Make a buffer, test a buffer lab
Sometimes the simplest ideas actually work. Shocking, I know. Having just taught about the idea of buffers, I felt like the students...
Brennan Koch
Nov 8, 20242 min read


A simple way to teach the inverse relation of wavelength and frequency in photons.
There are many ways to teach the inverse relationship between wavelength and frequency of photons. Videos. Slinkies. But I think this...
Brennan Koch
Oct 25, 20242 min read


Teach electron configuration with Battleship!
The electron configuration unit can get a little dry. Electron configuration is a tough unit for highly connected labs. Try using this...
Brennan Koch
Oct 18, 20243 min read


How dog training can help you become a better chemistry teacher
I was listening to a bird hunting podcast about how to train your bird dog, and I realized that they might as well have been talking...
Brennan Koch
Oct 4, 20244 min read


Use chemistry tests for growth, not punishment
Tests used to be punitive. I wielded them like a weapon, seeking out those who were underprepared and chopping them down like the...
Brennan Koch
Sep 27, 20244 min read


Introduce equilibrium with less mess and less headache.
The first time hearing about equilibrium can be confusing for students. That’s why there are so many ways to introduce it. Many are...
Brennan Koch
Sep 20, 20244 min read


Assess more. Grade less.
You should assess more. You should grade less. Those two statements seem mutually exclusive, but they aren’t. The longer that I teach,...
Brennan Koch
Sep 13, 20244 min read


Start teaching dimensional analysis with a puzzle instead of math.
Wish me luck. I start dimensional analysis today. For some (like many of us), it just makes sense. And for others (like many, many of...
Brennan Koch
Sep 6, 20243 min read


A better way to use the exploding gummy bear demo.
Don’t you hate it when you see a cool demo, but have no place for it? That is the way I felt about the exploding gummy bear demo. It’s...
Brennan Koch
Aug 23, 20243 min read


Use this demo to get students asking "How?"
This could be the most important question for students to be asking in chemistry; “How?” At almost every level of chem, one of the...
Brennan Koch
Aug 16, 20243 min read


What to do with AP Chem test scores (or any test score!)
It’s almost time. AP scores come out very soon. For some of us, it feels like Christmas slowly approaching. For others of us, it feels...
Brennan Koch
Jul 3, 20244 min read


Teach the gas laws using the disposable water bottle lid launching demo
If you have taught as long as I have, you have lived through at least two really annoying disposable water bottle fads. Bottle...
Brennan Koch
May 3, 20244 min read


Late to the Party: Tips for Doing the Blue Glitter Intermolecular Force Demo for the First Time
I was late to the party. Like really late. I just did the blue glitter intermolecular force demo for the first time. I know, it’s the...
Brennan Koch
Apr 12, 20244 min read


AP Chemistry Unit 9: How to Remember Which Electrode is the Anode and Cathode
It's crunch time for AP chemistry. Many of us are teaching unit 9 right now. Here is a visual reminder for them which electrode is the...
Brennan Koch
Apr 5, 20241 min read
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