Chapter summary
Qualitative Analysis, at a glance
Identify hydrogen, oxygen and carbon dioxide with tests that tell them apart.
SEC G2 Science K223 / K225 (2027)
Quick revision
Revisit the essentials, then return to an explanation when you need it.
Hydrogen: a lighted splint gives a squeaky pop. Oxygen: a glowing splint relights. Carbon dioxide: limewater turns milky (a white precipitate). Name the test and its result first, then the gas.
Check your understandingWhich single test distinguishes oxygen from carbon dioxide?Think it through, then reveal the answer
A glowing splint: it relights in oxygen and goes out in carbon dioxide. Confirm carbon dioxide with limewater, which turns milky.