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Chemistry · 70–139 · 11 concepts

Middle School Chemistry

Reasoning-first Middle School chemistry: 11 concepts, each with a clear explanation, a fully worked example, and self-check questions.

Practice at this level — free

Structure of matter

Atoms & moleculesElements & compoundsThe particle model of matterStates of matter & phase changes (particle view)Properties of matter (density, etc.)Mixtures, solutions & separationThe periodic table (intro)

Chemical reactions

Physical vs. chemical changesChemical reactions (intro)Conservation of massSynthetic materials (intro)