Place each process in the correct category: “only intermolecular interactions change” or “chemical bonds are broken or formed.”
(i) freezing liquid ethanol
(ii) dissolving CO₂(g) in water under pressure
(iii) polymerizing CH₂=CH₂(g) to produce polyethylene
(iv) subliming solid I₂
(v) cooking an egg (denaturation of proteins)
(vi) melting solid sodium metal