i) a sample of salt dissolving in a glass of water ii) the burning of natural gas iii) the freezing of water iv) the rusting of iron (a) All statements illustrate physical changes.
(i) a sample of salt; dissolving; in a glass of water ii) the burning of natural gas) (All statements; illustrate; physical changes)
i) a sample of salt All statements
dissolving illustrate
in a glass of water ii) the burning of natural gas
physical changes