back IGCSE Chemistry

Reaction
From
To
Alkenes and bromine water
orange
colourless
Alkanes and bromine water
orange
remains orange
Chlorine with damp litmus
blue
red then white/bleached
Hydrogen chloride – dry with blue litmus
blue
remains blue
Hydrogen chloride with damp blue litmus/hydrogen chloride in water with blue litmus
blue
red
Hydrogen chloride in methylbenzene with dry litmus
blue
blue
Test for the presence of water – anhydrous copper sulphate
white
blue
Reaction of copper with concentrated nitric acid

blue solution and brown fumes
Reaction of copper (II) salts with sodium hydroxide (test for Cu2+)
blue solution and colourless solution
light blue precipitate
Reaction of iron(II) salts with sodium hydroxide – test for Fe2+
green solution
green precipitate
Reaction of iron(III) salts with sodium hydroxide – test for Fe3+
orange brown solution
red brown precipitate
Sodium chloride + nitric acid + silver nitrate – test for Cl-
colourless solution
white precipitate
Sodium bromide + nitric acid + silver nitrate – test for Br-
colourless solution
pale cream precipitate
Sodium iodide + nitric acid + silver nitrate – test for I-
colourless solution
yellow precipitate
Sulphate compounds and barium chloride
colourless solution
white precipitate
Heating copper carbonate
green solid
black solid
Zinc or magnesium in copper sulphate solution
grey metal in blue solution
colourless solution and black solid
Magnesium burning forming magnesium oxide
silvery shiny solid
white solid
Colours of groups 1 and 2 compounds
white solids
colourless if dissolved in water
Hydrochloric acid and ammonia - neutralization
two colourless gases
white solid
Chlorine water and sodium bromide solution
two colourless solutions
yellow solution
Chlorine water and sodium iodide solution
two colourless solutions
brown solution
Bromine water and sodium iodide solution
two colourless solutions
brown solution
Heating hydrated copper sulphate
blue solid
white solid