hydrogen
squeaky pop
Oxygen
relighting a splint
Carbon dioxide
turning limewater cloudy
Li+
Crimsion - flame
Na+
Yellow - flame
K+
lilac - flame
Ca 2+
orange-red - flame
Cu 2+
green - flame
I-
yellow precipitate
Br-
cream precipitate
Cl-
white precipitate
Carbonates
Add dilute acid - produces co2 - lie water
Sulphates
Add dilute HCL then barium chloride - white precipitate