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59 resources
- guideFree5 min read
Printable Periodic Table PDFs for Class
Choose a free printable periodic table PDF with names, atomic masses, or blank cells. Direct downloads, paper sizes, and printing tips for class.
- guideFree8 min read
The New Chemistry Regents (2026–27)
The first Physical Science: Chemistry Regents was in June 2026. The next sitting is January 26, 2027. What changed, how it's scored, and how to prepare.
- guideFree7 min read
How the Hunt Brothers Cornered Silver
In 1980 two Texas brothers drove silver from $6 to nearly $50 an ounce, then couldn’t meet their margin calls in the crash. Industrial metal is hard to corner.
- guideFree6 min read
Helium Was Discovered on the Sun First
Helium is the only element found in space before Earth. Astronomers saw its yellow line in an 1868 eclipse, and chemists found it here 27 years later.
- guideFree6 min read
When Aluminum Was Worth More Than Gold
In the mid-1800s aluminum cost more than gold, because no one could free it from its ore. Then two young inventors did, and the price collapsed.
- guideFree7 min read
Chemistry Apps for Teachers
Students drill chemistry fluency in our mastery-gated games; you keep class time for reasoning and phenomena. Free full access for chemistry teachers.
- guideFree8 min read
What Happened to Collisions?
PlayMada wound down Collisions, its free chemistry game, in 2022. What happened, whether you can still use it, and what to use instead.
- guideFree7 min read
Why Your Kid Has Gaps in Chemistry
A class has one pace, but every kid is missing different pieces. Here's what mastery-based learning is and how we find each kid's gaps automatically.
- guideFree7 min read
Free Chemistry Printables for Teachers
Free, CC-licensed chemistry printables: periodic tables in Letter, A4, and 11×17, a blank worksheet, a wall poster, 118 element posters, and flashcards.
- guideFree8 min read
Fireworks Chemistry: Every Color in the Sky
Fireworks are flame tests at full scale: strontium burns red, barium green, copper blue. The chemistry of firework colors, and the chemicals we retired.
- guideFree7 min read
The Best Interactive Periodic Table
Most interactive periodic tables are for looking elements up. On the best one for learning them, you recall each element, with games and spaced repetition.
- guideFree6 min read
What Every Element Looks Like
Most elements are silvery metal, but bromine is a liquid, cesium is gold, gallium melts in your hand, and bismuth grows rainbow crystals. A visual tour.