Thanks for noticing! It's one of my favorites. We start with demos (heated stoppered flask, heated balloon-covered flask, twisted sealed water bottle, alka-seltzer + water in a stoppered flask), draw particle diagrams and arrows for each, and define pressure in terms of particle collisions.

One of my favorites is my gas laws note sheet, where students draw arrows, particle diagrams, graphs, and example PVnT problems for separate gas law relationships, after introducing/'discovering' these relationships using demos.

I love using the Men in a Well model to introduce patterns of electron energies, before using Bohr models. It starts with actual data instead of abstract theory, and when students see how the model connects to the periodic table, it's a huge 'lightbulb moment.'
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