subject
Chemistry
How matter is structured and transformed at the molecular scale, with attention to the reasoning behind chemical concepts rather than memorization.
7 lessons in chemistry
How Equilibrium Shifts Under Pressure: Le Chatelier's Principle
Imagine a sealed steel cylinder containing a mixture of nitrogen, hydrogen, and ammonia, sitting at equilibrium.
4 min · deepening
How Catalysts Speed Reactions Without Being Consumed
Drop a small piece of platinum gauze into a flask of hydrogen and oxygen at room temperature, and within seconds the mixture ignites.
4 min · foundation
Ionic and Covalent Bonds: Two Ways Atoms Hold Together
Drop a pinch of table salt into water and watch it vanish. The crystal — sodium chloride — does not melt or float; it dissociates, releasing sodium and chloride as separate charged particles that drif…
4 min · comparison
What an Acid Actually Is: The Brønsted-Lowry View
Drop a tablet of vitamin C into a glass of water and something quietly remarkable happens.
4 min · foundation
Why Entropy Tends to Increase
Drop a single drop of ink into a glass of still water and walk away.
4 min · deepening
Why the Periodic Table Is Periodic
Mendeleev arranged the elements by mass in 1869 and noticed something strange: chemical behavior repeated.
4 min · synthesis
Why Water Has Such Strange Properties
Drop an ice cube into a glass of water and watch it float. This is so familiar that it takes effort to notice how strange it is. Almost every other substance on Earth contracts when it freezes, so the…
4 min · foundation