ages 11–1515/15 lessons5 chapters

Middle school

The middle-school program lays the foundations of chemistry: matter, atoms, molecules, transformations. Five chapters to understand that everything — from air to your pen — is made of the same elementary building blocks. The last chapter bridges to high school: you meet the amount of substance and the periodic classification for the first time.

01Chapter
4/4
Matter and measurement
Recognizing matter, its physical states, its mixtures. Measuring mass, volume, density, mass concentration — the chemist's first quantitative tools.
4 published lessons
02Chapter
3/3
Atoms and molecules
From the simplified atomic model to molecules: matter is made of organized grains. Chemical symbols and first formulas.
3 published lessons
03Chapter
4/4
Chemical transformations
Identifying a chemical reaction, writing its equation, balancing. Mass conservation as the central principle.
4 published lessons
04Chapter
2/2
Electricity and chemistry
Why do some solutions conduct electricity? Discover ions, their charge, and their motion.
2 published lessons
05Bridge
2/2
Toward high school
Bridge chapter: a first encounter with two central high-school notions — amount of substance and the periodic classification.
2 published lessons

Matter and measurement

Atoms and molecules

Chemical transformations

Electricity and chemistry

Toward high school