What order should chemistry be taught in?
Matter first, because everything else names a kind of stuff. Atoms next, because reactions are rearrangements of atoms. The table before bonding, so patterns predict joins. Moles before reactions, so equations can be weighed. Gases, solutions, acids, and energy after that, because each leans on moles and reactions. Carbon last, because it uses all of them at once.
What age is this for?
Roughly 11 to 16 for the full path. Younger learners can take stops 1–4 as a story of stuff and atoms. Older students filling a gap should start at the missing stop, not at their age.
Does this cost anything, and is anything tracked?
Nothing costs anything. No account, no sign-in. Sound is off until you turn it on, and nothing you type is sent anywhere.