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OCR Chemistry F321 Exam. - [Next Tuesday[

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Original post by otrivine
what is the electronic configuation of Ca(OH)2 ? in terms of sub shells


Aren't we just supposed to know this for elements?:s-smilie:
Original post by Pride
that's a compound


in the book they asked us this question?????
Original post by otrivine
in the book they asked us this question?????


What book is it?
And page.
Reply 183
Avatar for myyrh
myyrh
9
Original post by eemooz
Me haha! I'm doing my whole chemistry a level. FML. :frown:


Join the club I'm doing all four units too :tongue:
Reply 184
Avatar for Dan12
Dan12
Original post by otrivine
in the book they asked us this question?????


they probably said what's the electron configuration of calcium in Ca(OH)2
Original post by Dan12
they probably said what's the electron configuration of calcium in Ca(OH)2


That's what I'm thinking..?
Original post by ohmyBEAUT
That's what I'm thinking..?


i think so ~
?? i need to check
Reply 187
Avatar for eemooz
eemooz
4
Original post by myyrh
Join the club I'm doing all four units too :tongue:


:O I remember you from some other thread haha, :smile:
Original post by otrivine
i think so ~
?? i need to check


Okay, once you find it, I'll answer the question.:smile:
Original post by ohmyBEAUT
Okay, once you find it, I'll answer the question.:smile:


thanks :wink: can you ask me a really hard question?
Original post by otrivine
thanks :wink: can you ask me a really hard question?


lol u still askin questions lol? just do a past paper ;p
Original post by Craming Revision
lol u still askin questions lol? just do a past paper ;p


i did all of them from jan 2012 to Jan 2009 and did 1 legacy paper
Original post by otrivine
thanks :wink: can you ask me a really hard question?


Explain how precipitation reactions can be used to distinguish between different halides. (7)

Not too challenging, but go for it.:smile:
In a NH4 molecule, where does one of the electrons go?
Original post by Dan12
they probably said what's the electron configuration of calcium in Ca(OH)2


Isn't it 1s22s22p63s33p6?
Original post by ohmyBEAUT
Explain how precipitation reactions can be used to distinguish between different halides. (7)

Not too challenging, but go for it.:smile:

use aqueous AGNO3
For chlorine a white ppt Use dilute ammonia to see ppt dissolves
For bromine cream ppt Use conc. ammonia to see ppt dissolving
For iodine yellow ppt Use conc ammonia and will not be soluble

do you want me to write equations or not ionic
Original post by AlligatorSky
In a NH4 molecule, where does one of the electrons go?


Is it to an H+ ion?
Original post by AlligatorSky
In a NH4 molecule, where does one of the electrons go?


Is this to do with dative covalent bonding?
Reply 198
Avatar for Pride
Pride
21
Original post by AlligatorSky
In a NH4 molecule, where does one of the electrons go?


There is a dative covalent bond, H+ is just a proton. a lone pair of electrons from the N atom forms a covalent bond with the H+.

the result is tetrahedral NH4+
Original post by otrivine
use aqueous AGNO3
For chlorine a white ppt Use dilute ammonia to see ppt dissolves
For bromine cream ppt Use conc. ammonia to see ppt dissolving
For iodine yellow ppt Use conc ammonia and will not be soluble

do you want me to write equations or not ionic


Yeah, with the equations. But I'm sure you know them.

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