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topic 6 (group seven (iodine is purple solid, bromine is a red brown gas,…
topic 6
group seven
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chlorine test, damp blue litmus paper turns red then bleaches
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A more reactive halogen can displace a less reactive in an aqueous solution of its salt.
chlorine will displace bromine and iodine
bromine will displace iodine but not chlorine
iodine can replace neither chlorine or iodine
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the symbol equation without potassium is:
Cl2 + 2Br- → 2Cl- + Br2
so for chlorine the half equation is:
Cl2 + 2e- → 2Cl-
chlorine has gained electrons, so it has been reduced
for bromine the half equation is:
2Br- → Br2 + 2e-
bromine has lost electrons, so it has been oxidised
group one
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lithium ---- fizzes steadily
sodium ------- melts into a ball then fizzes quickly
potassium ------- gives off sparks and hydrogen burns with a lilac flam
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group zero
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Low density = Helium used in balloons and airships since it is much less dense than air, so balloons filled with it float upwards
Inertness & non-flammability = argon, krypton and xenon inside light bulbs, stops the filament burning away
Inertness= argon used as a shield gas during welding, it is also denser than air which keeps it away from the metal
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