Chemistry: Post your doubts here!

[MiniSacBall]

Can someone please explain how to derive which Group and period an element is from using ionisation energies?

If i am not wrong you won't be asked for which period does it lie you will only be asked about group. You can only find period if the remove all the electrons from the element. (My guess)
If you are given ionization energies you just have to find the differences between them, You will find a pattern of small differences between ionization energies if you find a huge difference between them, that is the start of new shell.
Eg:
Ionization energies of X element are 200 -400- 600- 900 -2400 - 2800 - 3400
Here the element lies in group lies in group 4, because after the fourth ionization energy the electron is being remove the next complete shell. So there are 4 outer electrons thus it lies in group 4.

Hope this Helps,
I study AS idk about A level.

 

[MiniSacBall]

People I need someone to tell me the reaction of Al with Cl what happens without heating and with heating and the states of the products .. Thanks

[other members] Correct me if i am wrong.
Without heating/cold Al there will no reaction, i guess.
If you pass chlorine, on a hot aluminium the reaction will occur to give AlCl3 . I may dimerize to give Al2Cl6 ..
Hope this helps

 

[MiniSacBall]

If the i have two elements X & Y
X element has s orbital filled
while Y has p orbital filled
X will have higher ionization energy right!
For instance,
Which element has higher ionization energy Ne or Be and Why?

And Why does Na has lower melting point that Mg

 

[NinjaInPyjamas]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w05_qp_2.pdf

someone explain q5 (e) and (g) please?

 

[A star]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s05_qp_4.pdf 3 a (i) how do we know that the reaction has a higher activation energy?

 

[sadiaali]

Please can anyone explain me the hydrolysis of amides. I cant understand a word in book Please help
ZaqZainab
AbbbbY
Namehere
Suchal Riaz

 

[Haya Ahmed]

[other members] Correct me if i am wrong.
Without heating/cold Al there will no reaction, i guess.
If you pass chlorine, on a hot aluminium the reaction will occur to give AlCl3 . I may dimerize to give Al2Cl6 ..
Hope this helps

Anyways I got it form my textbook :3 .. It is Al with heating + O2 gives Al2O6 which is colorless gas at room temp
and Al + O2 ---> without heating gives AlCl3 (Colorless liquid) which can form to vapour (gas) easily by bunsen burner .. Hope I corrected your Info ^_^

 

[Suchal Riaz]

Please can anyone explain me the hydrolysis of amides. I cant understand a word in book Please help
ZaqZainab
AbbbbY
Namehere
Suchal Riaz

 

[Suchal Riaz]

Just in case anyone wants.

 

[hellangel1]

Any one has notes for NMR?
how to solve those questions?

 

[♣♠ Magnanimous ♣♠]

Any one has notes for NMR?
how to solve those questions?

NMR?

 

[MiniSacBall]

Anyways I got it form my textbook :3 .. It is Al with heating + O2 gives Al2O6 which is colorless gas at room temp
and Al + O2 ---> without heating gives AlCl3 (Colorless liquid) which can form to vapour (gas) easily by bunsen burner .. Hope I corrected your Info ^_^

Well for me i read that you have to add cl and heat it too.

 

[hellangel1]

NMR?

Nuclear magnetic resonance. Its a part of applications

 

[♣♠ Magnanimous ♣♠]

Nuclear magnetic resonance. Its a part of applications

http://www.chemguide.co.uk/analysis/nmr/highres.html
http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/nmr/nmr1.htm

 

[Thought blocker]

http://www.chemguide.co.uk/analysis/nmr/highres.html
http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/nmr/nmr1.htm

You knew how to solve organic chemistry right, you cheated that you don't know, Now see...

 

[♣♠ Magnanimous ♣♠]

You knew how to solve organic chemistry right, you cheated that you don't know, Now see...

Bro i have downloaded the notes right now.. and i dont know about the topic i just searched and gave her simple.

 

[Thought blocker]

Bro i have downloaded the notes right now.. and i dont know about the topic i just searched and gave her simple.

-_- kaley hu tane maris

 

[♣♠ Magnanimous ♣♠]

-_- kaley hu tane maris

why?

 

[Thought blocker]

why?

Temme what do I memorize ? And I'll memorize it today and you ask me tomorrow whole thing

 

[♣♠ Magnanimous ♣♠]

Temme what do I memorize ? And I'll memorize it today and you ask me tomorrow whole thing

well tomorrow how willl you come? pick me up in activa