Group 17

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Flashcards on Group 17, created by I Shouldn't be awake on 20/04/2018.
I Shouldn't be awake
Flashcards by I Shouldn't be awake, updated more than 1 year ago
I Shouldn't be awake
Created by I Shouldn't be awake over 6 years ago
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Resource summary

Question Answer
Trend in bpt Increase down group as: ^e- = more dipoles = stronger London forces More E to break IM forces
Trends in Reactivity In redox X2 gains 1 electron Decreases down a group Atomic radius ^ Shielding ^ Ability to attract electron decrease
Halogen molecule state at RTP colour in hexane F2 - Pale yellow gas Cl2 - Pale green gas - pale green Br2 - Red-brown liquid - orange I2 - Shiny grey/black solid - Violet
E config s2p6
Role in redox reactions Reduced gain an e- to get full OSE config.
Displacement More reactive halogen will displace a less reactive halogen in a solution if its halide ions. i.e. Cl2 + 2Br- -> 2Cl- + Br2
How to differentiate between displaced halogens Dissolve in hexane Cl2 -> pale green Br2 -> Orange I2 -> Violet
Disproportionation Element is R and O in the same redox reaction
Cl2 disproportionation reactions (2) + H2O + NaOH (cold, dilute)
Cl2+H2O HClO + HCl
Cl2+ 2NaOH NaClO + NaCl + H2O
Why use NaOH? Cl2 LIMITED by low sol. of Cl2 in H2O. If water contains NaOH then much more will dissolve.
Dangers Chlorinated HC Chlorine gas
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