Chemical Tests GCSE

All the required chemical tests for Edexcel iGCSE Chemistry

When burnt produces a red flame

Lithium

When burnt produces a yellow flame

Sodium

When burnt produces a lilac flame

Potassium

When burnt produces an orange-red flame

Calcium

When burnt produces a blue-green flame

Copper (II)

Blue precipitate formed when added to dilute sodium hydroxide solution

Copper (II)

Green precipitate formed when added to dilute sodium hydroxide solution

Iron (II)

Orange brown precipitate formed when added to dilute sodium hydroxide solution

Iron (III)

Lit splint when exposed to this gas makes a “squeaky pop”

Hydrogen

Glowing splint relights when exposed to this gas

Oxygen

When this gas is bubbled through limewater, it turns cloudy

Carbon Dioxide

Damp red litmus paper turns blue

Ammonia

Damp blue litmus paper turns red then white

Chlorine

This substance boils at exactly 100 Celsius

Water (physical test)

Added to anhydrous copper sulphate, turns the copper sulphate blue

Water (chemical test)

Added to hydrochloric acid, produces bubbles

Carbonate

White precipitate formed when silver nitrate added to nitric acid + compound solution

Chlorine

Cream precipitate formed when silver nitrate added to nitric acid + compound solution

Bromine

Yellow precipitate formed when silver nitrate added to nitric acid + compound solution

Iodine

White precipitate formed when solution added to HCl and Barium Chloride

Sulphate

When added to sodium hydroxide solution and gently warmed, damp red litmus turns blue

Ammonium