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AQA A-level chemistry chemical tests And 1.5 Kinetics Practice Tests
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AQA A-level chemistry chemical tests And 1.5 Kinetics Practice Tests
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AQA A-level chemistry chemical testsAnd 1.5 Kinetics Practice Tests
chemical tests
test for Carbon Dioxide (CO2 ) - Answer>> turns limewater
milky (sparingly soluble Ca(OH) 2 forms insoluble CaCO3 )
Chlorine (Cl2 ) test - Answer>> bleaches damp litmus paper
(Cl2 reacts with water to form HCl and HOCl)
Hydrogen (H2 ) test - Answer>> pops with a lighted splint
Oxygen (O2 ) test - Answer>> relights a glowing splint
Carbonate (CO 3 2- ) test - Answer>> add dilute acid;
effervescence, carbon dioxide produced
Sulfate (SO4 2- ) test - Answer>> add dilute nitric acid then
aqueous barium nitrate. Gives white precipitate
Chloride (Cl - ) test - Answer>> add dilute nitric acid then
aqueous silver nitrate. Gives white precipitate. Dissolves in dilute
ammonia to give colourless solution (of [Ag(NH 3 ) 2 ] + )
Bromide (Br - ) test - Answer>> add dilute nitric acid then
aqueous silver nitrate. Gives cream precipitate. Dissolves in
concentrated ammonia but not in dilute ammonia
, Iodide (I - ) test - Answer>> add dilute nitric acid then aqueous
silver nitrate. Gives yellow precipitate. Does not dissolve in either
concentrated or dilute ammonia
Iron II (Fe 2+ ) test - Answer>> add aqueous sodium hydroxide
gives green precipitate, insoluble in excess
Iron III (Fe 3+ ) test - Answer>> add aqueous sodium hydroxide
gives orange/brown precipitate, insoluble in excess
Copper (Cu 2+ ) test - Answer>> add aqueous sodium
hydroxide gives blue precipitate, insoluble in excess. Or add
ammonia: gives a blue precipitate which dissolves in excess to
give a blue solution
Calcium (Ca 2+ ) test - Answer>> add aqueous sodium
hydroxide gives white precipitate, insoluble in excess.
Aluminium (Al 3+ ) test - Answer>> add aqueous sodium
hydroxide gives white precipitate which dissolves in excess
H + (any acid) test - Answer>> turns blue litmus red or makes
sodium carbonate effervesce (makes CO 2 gas)
H2O test - Answer>> turns white anhydrous copper (II)
sulphate into blue hydrated copper (II) sulphate. It also turns blue
anhydrous cobalt (II) chloride into pink hydrated cobalt (II)
chloride reaction is reversible, colour changes reversed when
hydrated salts are heated.
Test for Unsaturated hydrocarbons - Answer>> turns bromine
water from orange to colourless.
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