Flashcards
Group 17
Cards in this deck (13)
- 1Trend in bptIncrease down group as:
^e- = more dipoles = stronger London forces
More E to break IM forces - 2Trends in ReactivityIn redox X2 gains 1 electron
Decreases down a group
Atomic radius ^
Shielding ^
Ability to attract electron decrease - 3Halogen molecule state at RTP colour in hexaneF2 - Pale yellow gas
Cl2 - Pale green gas - pale green
Br2 - Red-brown liquid - orange
I2 - Shiny grey/black solid - Violet - 4E configs2p6
- 5Role in redox reactionsReduced gain an e- to get full OSE config.
- 6DisplacementMore reactive halogen will displace a less reactive halogen in a solution if its halide ions.
i.e.
Cl2 + 2Br- -> 2Cl- + Br2 - 7How to differentiate between displaced halogensDissolve in hexane
Cl2 -> pale green
Br2 -> Orange
I2 -> Violet - 8DisproportionationElement is R and O in the same redox reaction
- 9Cl2 disproportionation reactions (2)+ H2O
+ NaOH (cold, dilute) - 10Cl2+H2OHClO + HCl
- 11Cl2+ 2NaOHNaClO + NaCl + H2O
- 12Why use NaOH?Cl2 LIMITED by low sol. of Cl2 in H2O.
If water contains NaOH then much more will dissolve. - 13DangersChlorinated HC
Chlorine gas
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- User has deleted their subject information Flashcards on Group 17, created by Deleted user on 27/04/2018.
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- Created by I Shouldn't be awake · Apr 20, 2018
- Copied by I Shouldn't be awake · Apr 27, 2018
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