IGCSE CHEMISTRY: COLOURS
Trusted by students across multiple disciplines!
Ag (s) - Answer: Silver. Learn
Agbr (s) - Answer: Cream. Result of test for bromide ions (agno₃ + Br⁻) is a cream
precipitate, which is silver bromide
Agcl (s) - Answer: White. Result of test for chloride ions (agno₃ + Cl⁻) is a white
precipitate, which is silver chloride
Agi (s) - Answer: Yellow. Result of test for iodide ions (agno₃ + I⁻) is a yellow
precipitate, which is silver iodide
At (s) - Answer: Black. Black, probably, though nobody knows. The halogens get darker
as we go down the group, and iodine is dark grey, so astatine is probably black.
Au (s) - Answer: Gold. Learn
Baso₄ (s) - Answer: White. Result of test for sulfate ions (bano₃ + SO₄²⁻) which
produces a white precipitate of barium sulfate
Br₂ (aq) - Answer: Orange. Used in test to distinguish between an alkane (no result)
and an alkene (goes colourless)
Br₂ (l) - Answer: Red-brown. Bromine is one of only two elements which are liquid at
room temperature. The other is mercury, which is very different from bromine.
C (s) - Answer: It depends. Carbon comes in different forms (allotropes). Diamond is a
colourless solid, graphite is a grey solid, and charcoal is black
Ca(OH)₂ (aq) - Answer: Colourless. Limewater is calcium hydroxide
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, Ca²⁺ (flame test) - Answer: Orange/red. Learn
Caco₃ (s) - Answer: White. Calcium carbonate. Marble/chalk/limestone. Is the white
precipitate formed when carbon dioxide is bubbled through limewater
Cl₂ (aq) - Answer: Green. Learn
Cl₂ (g) - Answer: Green. Learn
CO (g) - Answer: Colourless. Learn
CO₂ (g) - Answer: Colourless. Learn
Cr³⁺ (aq) (Triple Science Only) - Answer: Green. Oxidation of alcohol to carboxylic acid,
using dichromate. The dichromate is reduced to Cr³⁺
Cu (s) - Answer: Copper. Learn
Cu(OH)₂ (s) - Answer: Blue. Copper (II) hydroxide. Is the result of test for Cu²⁺ ions
(naoh + Cu²⁺). Precipitate.
Cu²⁺ (flame test) - Answer: Blue/green. Learn
Cuco₃ (s) - Answer: Green. Learn. Copper carbonate
Cuo (s) - Answer: Black. Learn. Copper oxide is the black powder we can react with
sulfuric acid to produce those lovely blue copper sulfate crystals
Cuso₄ (aq) - Answer: Blue. Copper (II) sulfate solution. Crystallise this to make blue
copper (II) sulfate crystals.
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
Trusted by students across multiple disciplines!
Ag (s) - Answer: Silver. Learn
Agbr (s) - Answer: Cream. Result of test for bromide ions (agno₃ + Br⁻) is a cream
precipitate, which is silver bromide
Agcl (s) - Answer: White. Result of test for chloride ions (agno₃ + Cl⁻) is a white
precipitate, which is silver chloride
Agi (s) - Answer: Yellow. Result of test for iodide ions (agno₃ + I⁻) is a yellow
precipitate, which is silver iodide
At (s) - Answer: Black. Black, probably, though nobody knows. The halogens get darker
as we go down the group, and iodine is dark grey, so astatine is probably black.
Au (s) - Answer: Gold. Learn
Baso₄ (s) - Answer: White. Result of test for sulfate ions (bano₃ + SO₄²⁻) which
produces a white precipitate of barium sulfate
Br₂ (aq) - Answer: Orange. Used in test to distinguish between an alkane (no result)
and an alkene (goes colourless)
Br₂ (l) - Answer: Red-brown. Bromine is one of only two elements which are liquid at
room temperature. The other is mercury, which is very different from bromine.
C (s) - Answer: It depends. Carbon comes in different forms (allotropes). Diamond is a
colourless solid, graphite is a grey solid, and charcoal is black
Ca(OH)₂ (aq) - Answer: Colourless. Limewater is calcium hydroxide
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, Ca²⁺ (flame test) - Answer: Orange/red. Learn
Caco₃ (s) - Answer: White. Calcium carbonate. Marble/chalk/limestone. Is the white
precipitate formed when carbon dioxide is bubbled through limewater
Cl₂ (aq) - Answer: Green. Learn
Cl₂ (g) - Answer: Green. Learn
CO (g) - Answer: Colourless. Learn
CO₂ (g) - Answer: Colourless. Learn
Cr³⁺ (aq) (Triple Science Only) - Answer: Green. Oxidation of alcohol to carboxylic acid,
using dichromate. The dichromate is reduced to Cr³⁺
Cu (s) - Answer: Copper. Learn
Cu(OH)₂ (s) - Answer: Blue. Copper (II) hydroxide. Is the result of test for Cu²⁺ ions
(naoh + Cu²⁺). Precipitate.
Cu²⁺ (flame test) - Answer: Blue/green. Learn
Cuco₃ (s) - Answer: Green. Learn. Copper carbonate
Cuo (s) - Answer: Black. Learn. Copper oxide is the black powder we can react with
sulfuric acid to produce those lovely blue copper sulfate crystals
Cuso₄ (aq) - Answer: Blue. Copper (II) sulfate solution. Crystallise this to make blue
copper (II) sulfate crystals.
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
