4.6 Gas Tests
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give the test and result for H2
lit spint –> squeaky pop
give the test and result for O2
glowing splint –> relights
give the test and result for CO2
bubble through limewater –> clear to cloudy
give the test and result for Cl2
damp blue litmus –> bleached white
what colour is the litmus used when testing for Chlorine
blue
why is blue litmus used to test for Cl2
as it goes red and then white (red proves the acidic properties of Cl2 when dissolved in water)
give the test for Ammonia (NH3)
damp red litmus –> red to blue
what colour does dry red litmus go in the presence of NH3
stays red as needs water to prove Alkali properties of NH3
what colour of litmus is used when testing for NH3
red
why is red litmus used when testing for NH3
as NH3 is alkali when dissolved in water
Chemical test and result for H2O
anhydrous copper sulphate –> white to blue
what does anyhydrous copper culphate NOT do?
show how pure the water is
give the 2 physical tests for water (H2O)
BP = 100C MP = 0C
give 2 uses of H2
• Haber process • Fuel cells
what does O2 do
enriches steel blast furnaces
how is CO2 formed [3 points]
when gas [1] and oil [2] and coal [3] are burned
give 2 uses of NH4 (NH3)
• fertiliser • surface cleaner (in DILUTED) form
what colour is Cl2
(pale) green gas
give 2 uses of Cl2
• disinfect swimming pools • makes antiseptics
give a use of C2H4 (ethene)
aftf: - making polyethen - plant hormone to control ripening and colour - development of fruit