Question 4 • Chemistry A.1 - F26 - Jacob Metsker
A strong perfume spreads through a room as its molecules naturally move from an area of high concentration to areas of lower concentration. This diffusion happens without needing continuous external energy, so it is spontaneous. Electrolysis and separating sodium from sodium chloride require energy, while removing iron filings with a magnet requires an external magnet to do the separating.
AI-written and checked against the verified answer.