Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
red_911:
--- Quote from: Fidato on May 03, 2011, 06:07:05 pm ---NaCl :
has ionic bonding;
giant ionic structure;
both elements face greater difference in electonegativies, so will bond more strongly thus structure is rigid.
AgCl :
holds polar covalent bonding;
less difference in electronegativities (recall the trend of electrinegativity across and down the periodic table), so will bond less strongly and hence sometimes covalently.
http://en.wikipedia.org/wiki/Ionic_polarization#Ionic_polarization
--- End quote ---
yea u are right fidato .. n Thanks for replying .. but your answer was with reference to electronegativity difference, i want the answer by considering ion polarisation :-\
SkyPilotage:
--- Quote from: red_911 on May 03, 2011, 06:26:44 pm ---yea u are right fidato .. n Thanks for replying .. but your answer was with reference to electronegativity difference, i want the answer by considering ion polarisation :-\
--- End quote ---
Well, this is because The silver ion is smaller than the sodium ion and has a higher charge density so is able to attract the electrons from the chloride ion closer to it ( we say the anion has been polarised) hence showing more covalent character than sodium chloride. This is also the same for the bromides or iodides but not the same in the flourides because flourine has a smaller radius so it is much harder to move electrons away from it due to the nuclear attraction to the electrons...
red_911:
--- Quote from: SkyPilotage on May 03, 2011, 07:15:55 pm ---Well, this is because The silver ion is smaller than the sodium ion and has a higher charge density so is able to attract the electrons from the chloride ion closer to it ( we say the anion has been polarised) hence showing more covalent character than sodium chloride. This is also the same for the bromides or iodides but not the same in the flourides because flourine has a smaller radius so it is much harder to move electrons away from it due to the nuclear attraction to the electrons...
--- End quote ---
but i checked on many websites, sodium has a smaller ionic radius than silver :S
SkyPilotage:
--- Quote from: red_911 on May 03, 2011, 07:28:36 pm ---but i checked on many websites, sodium has a smaller ionic radius than silver :S
--- End quote ---
I mean inside the compound, silver has a smaller ionic radii than the sodium ion in NaCl....This is only shown in chlorides and bromides..
By the way I think bond polarisation isnt required in As? As only required you to know abt Aluminum?
Arthur Bon Zavi:
Question 1 please.
http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w06_qp_1.pdf
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