Oxygen: 21%, relights the glowing splint, causes a burning splint to burn more brightly, is used to help patients with breathing difficulties, Nitrogen: no simple tests, 78%, is used to fill some food packages, very unreactive, Carbon dioxide: 0.03%, turns hydrogencarbonate indicator from red to yellow, turns limewater from colourless to milky, used in fire extinguishers to put out fires, Water vapour: turns dry cobalt chloride paper from blue to pink, varied,

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