[Verse 1] Bottle on the table, zoom into the water: Two hydrogen, one oxygen, bonded to each other. A molecule has atoms bonded as a group; Different elements make this a compound too. O two has two oxygens bonded in a pair; A molecule, one element—no compound there. A bond is an attraction holding atoms together; Name the kinds before you sort them into headers. [Chorus] Small number: how many in one? Big number: how many groups come? Count each kind, then count the whole; Letters and numbers both have roles. [Verse 2] Two water molecules: two copies of the plan, Four hydrogen, two oxygen—six atoms in my hand. No written subscript? One is understood. Change water to peroxide and the change is not just looks. H two O two has a different composition; The numbers aren't decorations in that written description. Scientists separated substances to learn what they contained; Evidence of elements combined, then separated again. [Final Chorus] Small number: how many in one? Big number: how many groups come? Count each kind, then count the whole; Letters and numbers both have roles.
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