2
AQA GCSE Chemistry paper 2
"How is potable water produced from ground water? - CORRECT ANSWER An
appropriate source of fresh water is chosen. The water is passed through filter beds and
then sterilised using chlorine, ozone or ultraviolet light."
"Steps involved in sewage (waste water) treatment (eg to produce potable water) -
CORRECT ANSWER screening, grit removal, sedimentation (to produce sewage
sludge and effluent), anaerobic digestion of sewage sludge, aerobic digestion of
effluent"
"What does sedimentation of sewage produce? - CORRECT ANSWER sewage sludge
and effluent"
"What is the name of the process by which potable water is obtained from sea water? -
CORRECT ANSWER desalination"
"Suggest the names of two processes we can use to extract metals other than mining
(which involves digging, moving and disposing of large amounts of rock)? - CORRECT
ANSWER phytomining and bioleaching"
"What happens to the ammonia produced by the Haber Process when it cools? -
CORRECT ANSWER it liquefies and is removed"
"What happens to the remaining hydrogen and nitrogen at the end of the Haber
process? - CORRECT ANSWER It is recycled."
"Phosphate rock + nitric acid - CORRECT ANSWER phosphoric acid + calcium nitrate
(phosphoric is then neutralised with ammonia to produce ammonium phosphate which
can be used as part of the NPK fertiliser)"
"Phosphate rock + sulfuric acid - CORRECT ANSWER calcium sulfate + calcium
phosphate (this mixture is called single superphosphate)"
"Phosphate rock + phosphoric acid - CORRECT ANSWER calcium phosphate (triple
superphosphate)"
"What is an NPK fertiliser? - CORRECT ANSWER a formulation containing soluble
salts of nitrogen, phosphorus and potassium, which helps plants to grow larger more
rapidly"
"List the factors which affect the rate of a reaction. - CORRECT ANSWER
concentration, pressure, surface area, temperature, presence of catalysts"
, 2
"define hypothesis (in science) - CORRECT ANSWER a testable proposal that could
explain a fact or observation"
"advantages of flame emission spectroscopy over flame tests - CORRECT ANSWER
very sensitive, very fast, very accurate"
"colour of precipitate when sodium hydroxide is added to Cu 2+ - CORRECT ANSWER
light blue"
"colour of precipitate when sodium hydroxide is added to Fe 3+ - CORRECT ANSWER
reddish-brown"
"colour of precipitate when sodium hydroxide is added to Fe 2+ - CORRECT ANSWER
light green"
"colour of precipitate when sodium hydroxide is added to Al 3+ - CORRECT ANSWER
white"
"colour of precipitate when sodium hydroxide is added to Mg 2+ - CORRECT ANSWER
white"
"colour of precipitate when sodium hydroxide is added to+ Ca 2+ - CORRECT
ANSWER white"
"Does the white precipitate of Al 3+ dissolve in excess sodium hydroxide solution? -
CORRECT ANSWER yes"
"Does the white precipitate of Ca 2+ dissolve in excess sodium hydroxide solution? -
CORRECT ANSWER no"
"Does the white precipitate of Mg 2+ dissolve in excess sodium hydroxide solution? -
CORRECT ANSWER no"
"test for carbonate ion, CO3 2- - CORRECT ANSWER add dilute (hydrochloric) acid,
put the bubbles through limewater, it is CO2 and should turn it cloudy"
"test for sulfate ion, SO4 2- - CORRECT ANSWER barium chloride added, white
precipitate forms"
"test for chloride ion, Cl - - CORRECT ANSWER Add a few drops of nitric acid and a
few drops of silver nitrate, turns white"
AQA GCSE Chemistry paper 2
"How is potable water produced from ground water? - CORRECT ANSWER An
appropriate source of fresh water is chosen. The water is passed through filter beds and
then sterilised using chlorine, ozone or ultraviolet light."
"Steps involved in sewage (waste water) treatment (eg to produce potable water) -
CORRECT ANSWER screening, grit removal, sedimentation (to produce sewage
sludge and effluent), anaerobic digestion of sewage sludge, aerobic digestion of
effluent"
"What does sedimentation of sewage produce? - CORRECT ANSWER sewage sludge
and effluent"
"What is the name of the process by which potable water is obtained from sea water? -
CORRECT ANSWER desalination"
"Suggest the names of two processes we can use to extract metals other than mining
(which involves digging, moving and disposing of large amounts of rock)? - CORRECT
ANSWER phytomining and bioleaching"
"What happens to the ammonia produced by the Haber Process when it cools? -
CORRECT ANSWER it liquefies and is removed"
"What happens to the remaining hydrogen and nitrogen at the end of the Haber
process? - CORRECT ANSWER It is recycled."
"Phosphate rock + nitric acid - CORRECT ANSWER phosphoric acid + calcium nitrate
(phosphoric is then neutralised with ammonia to produce ammonium phosphate which
can be used as part of the NPK fertiliser)"
"Phosphate rock + sulfuric acid - CORRECT ANSWER calcium sulfate + calcium
phosphate (this mixture is called single superphosphate)"
"Phosphate rock + phosphoric acid - CORRECT ANSWER calcium phosphate (triple
superphosphate)"
"What is an NPK fertiliser? - CORRECT ANSWER a formulation containing soluble
salts of nitrogen, phosphorus and potassium, which helps plants to grow larger more
rapidly"
"List the factors which affect the rate of a reaction. - CORRECT ANSWER
concentration, pressure, surface area, temperature, presence of catalysts"
, 2
"define hypothesis (in science) - CORRECT ANSWER a testable proposal that could
explain a fact or observation"
"advantages of flame emission spectroscopy over flame tests - CORRECT ANSWER
very sensitive, very fast, very accurate"
"colour of precipitate when sodium hydroxide is added to Cu 2+ - CORRECT ANSWER
light blue"
"colour of precipitate when sodium hydroxide is added to Fe 3+ - CORRECT ANSWER
reddish-brown"
"colour of precipitate when sodium hydroxide is added to Fe 2+ - CORRECT ANSWER
light green"
"colour of precipitate when sodium hydroxide is added to Al 3+ - CORRECT ANSWER
white"
"colour of precipitate when sodium hydroxide is added to Mg 2+ - CORRECT ANSWER
white"
"colour of precipitate when sodium hydroxide is added to+ Ca 2+ - CORRECT
ANSWER white"
"Does the white precipitate of Al 3+ dissolve in excess sodium hydroxide solution? -
CORRECT ANSWER yes"
"Does the white precipitate of Ca 2+ dissolve in excess sodium hydroxide solution? -
CORRECT ANSWER no"
"Does the white precipitate of Mg 2+ dissolve in excess sodium hydroxide solution? -
CORRECT ANSWER no"
"test for carbonate ion, CO3 2- - CORRECT ANSWER add dilute (hydrochloric) acid,
put the bubbles through limewater, it is CO2 and should turn it cloudy"
"test for sulfate ion, SO4 2- - CORRECT ANSWER barium chloride added, white
precipitate forms"
"test for chloride ion, Cl - - CORRECT ANSWER Add a few drops of nitric acid and a
few drops of silver nitrate, turns white"
