Chemistry
17 interactive videos. Watch each one, then try the idea live. Free, no account.
What Is an Atom?
The smallest piece of an element. Protons + neutrons in a nucleus, electrons in clouds.
Solid, Liquid, Gas
Same atoms, different dance moves. Vibrate, slide, or fly — depends on temperature.
What Is a Chemical Reaction?
Atoms rearrange. Bonds break, new bonds form. Same atoms in, new molecules out.
Why Water Is Special
Bent, polar, sticky. Five superpowers from one weird molecule — and the reason life exists.
Meet the Elements
118 ingredients make EVERYTHING. Mendeleev's periodic table is chemistry's master key.
Acids & Bases
Opposites that neutralize each other. The pH scale tells you which is which — 0 to 14.
How Fire Works
Fuel + oxygen + heat = chemical reaction with light. Remove any side, fire dies.
Why Things Rust
Rust is fire on a thousand-year timer. Same chemistry, slow speed.
Why Soap Cleans
Soap molecules have two faces — one loves water, one loves grease. Genius bridge.
Why Things Smell
Volatile molecules drift through air. Locked-up molecules don't. Heat sets them free.
Metals vs Nonmetals
Sea of free electrons makes metals shiny, bendy, conducting. Nonmetals lock theirs up.
Carbon, the Life Builder
4 bonds → infinite molecules. The element behind every living thing AND diamonds.
Melting & Freezing
Same number, two directions. 0°C is both — and salt lowers it. Latent heat hides in plateaus.
Mixing vs Reacting
Mix = hang out, separable. React = new molecules, hard to reverse. Two very different things.
Why Leaves Change Color
Fall colors were there all summer — hidden under green. Cool nights unmask them.
Why Metals Shine
Free electrons absorb light and instantly re-emit it. That's why every mirror is metal.
The Noble Gases
Their electron shells are full, so they barely react. Helium balloons, neon signs, MRI cooling.