Molecules are mixtures of atoms tightly bound together to form a chemically identifiable unit. Many things and compounds — but not all — are composed of molecules. Molecules of things are homonuclear, because They are really made up of only just one kind of atom. Molecules of compounds are heteronuclear, https://chemical-reactions-revisi17283.blogzet.com/examples-of-chemical-reactions-no-further-a-mystery-39411095