Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
Twinkle Charms:
--- Quote from: Deadly_king on September 25, 2010, 03:55:58 pm ---From the given values, we can note a very significant rise (more than twice) from the second ionisation energies to the third ionisation energies. This suggest that there has been a change in orbitals(more precisely shell number) which proves that the element has two electrons in its outermost shell.
Therefore the element is in group 2.
Did you get me??
If not......let me know and i'll try to elaborate more :)
--- End quote ---
you mean to say because there is a large change in ionisation energies between 2nd and 3rd, which shows that the 3rd electron is in other shell and the first two in the valence shell??
Deadly_king:
--- Quote from: Twinkle Charms on September 25, 2010, 04:02:18 pm ---you mean to say because there is a large change in ionisation energies between 2nd and 3rd, which shows that the 3rd electron is in other shell and the first two in the valence shell??
--- End quote ---
Yeah you got it right.
Normally the ionisation energies always rises from the first to the last since the force of attraction between the electrons and the nucleus will be greater with less electrons present.
But if the change in ionisation energies is much larger that the previous one, it implies a change in shell number.
Twinkle Charms:
--- Quote from: Deadly_king on September 25, 2010, 04:08:35 pm ---Yeah you got it right.
Normally the ionisation energies always rises from the first to the last since the force of attraction between the electrons and the nucleus will be greater with less electrons present.
But if the change in ionisation energies is much larger that the previous one, it implies a change in shell number.
--- End quote ---
yo im gettin smarter haha ;)
thank yooouuu :)
Deadly_king:
--- Quote from: Twinkle Charms on September 25, 2010, 04:10:27 pm ---yo im gettin smarter haha ;)
thank yooouuu :)
--- End quote ---
Hahaha.....very good :)
keep up the good work ;)
You are most welcome :)
Twinkle Charms:
Q) Tin reacts with iodine in an organic solvent to form a covalent compound SnIx when 0.4650g of Sn (in excess) was used; all the iodine reacted. A mass of 0.1230g of unreacted Sn and 1.8020g of SnIx were obtained. Find the value of x.
ok so i got the mass of Sn used by subtracting 0.1230 from 0.4650 =0.342g, now for iodine how do i go about? subtract the mass of Sn used from the total mass of the product that is 1.8020? or i find it thru the mole ratio thing? if tht is so then how do i know the number of moles of each and how can i write a balanced equation out of it when we have SnIx ??
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