Skip to content
One Long Tail
Lessons
Hands-on
Plans
About us
Menu
Lessons
all 428, by branch
Hands-on
lessons you can touch
Plans
what we're building
About us
who we are, contact
All chemistry lessons
Chemistry
Lesson 19 of 76
Dalton's atomic theory
Why do they always combine in the same proportions?
300 BC
today
Era 2 of 7:
The quantitative revolution
, 1750 – 1820
Check yourself
Loading exercises…