HALOGENS: Group 7 Non-Metals that are poisonous and commonly includes Chlorine, Bromine and Iodine
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DISPLACEMENT REACTIONS
sDISPLACEMENT REACTION: When a more reactive Halogen displaces a less reactive Halogen for an Aqueous Solution of its Halide
s- Reactivity of Group 7 Non-Metals increases as you go up the Group
- Out of the 3 Halogens - Chlorine, Bromine and Iodine, Chlorine is the most reactive and iodine is the least reactive
AQUEOUS SOLUTION COLOUR OF HALOGENS:
AQUEOUS SOLUTION | COLOUR |
CHLORINE | Very pale green, but usually appears colourless as it is dilute |
BROMINE | Orange but will turn yellow when diluted |
IODINE | Brown |
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Examples:
sChlorine is above Bromine in Group 7 so is more reactive. Chlorine will therefore displace Bromine from an Aqueous Solution of Metal Bromide:
Chlorine + Potassium Bromide Solution → Potassium Chloride Solution + Bromine |
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Chlorine is also above Iodine in Group 7 so is more reactive. Chlorine will therefore displace Iodine from an Aqueous Solution of Metal Iodide:
sChlorine + Sodium Iodide Solution → Sodium Chloride Solution + Iodine |
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Bromine is above Iodine in Group 7 so is more reactive. Bromine will therefore displace Iodine from an Aqueous Solution of Metal Iodide:
sBromine + Magnesium Iodide Solution → Magnesium Bromide Solution + Iodine |
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