Chemistry: Post your doubts here!

[Suchal Riaz]

I've made this site that can help you to quickly access past papers for a few common subjects. Try it out and please give feedback.

IGCSE: http://tinyurl.com/igcsepaper
AS & A Level: http://tinyurl.com/ciepaper

does openshift has SSH support?

 

[Harsh Poddar]

does openshift has SSH support?

Yes it does

 

[Suchal Riaz]

Yes it does

i prefer a vitual linux server on my own PC and upload the sources to 000webhost they have neat URLs at least. you can upload the source by FTPs. co.cc is dead now. co.cc had support for nameservers but i haven't seen any other free domain registrar provide nameserver support for free.

 

[Harsh Poddar]

i prefer a vitual linux server on my own PC and upload the sources to 000webhost they have neat URLs at least. you can upload the source by FTPs. co.cc is dead now. co.cc had support for nameservers but i haven't seen any other free domain registrar provide nameserver support for free.

Yeah, but git is powerful for version control and I use it for my other projects and demo.

 

[Suchal Riaz]

Yeah, but git is powerful version control and I use it for my other projects and demo.

maybe we should start a separate conversation. these people would be confused my these things on chemistry thread lol

 

[Harsh Poddar]

maybe we should start a separate conversation. these people would be confused my these things on chemistry thread lol

Yeah We're spamming the forum

 

[MiniSacBall]

Group 1 compounds have white colors, while the Group 2 compounds are colorless! Right?
Transition metal have colored compounds right?

 

[Namehere]

Group 1 compounds have white colors, while the Group 2 compounds are colorless! Right?
Transition metal have colored compounds right?

Yes, not colourless - just white, and yes!

 

[Suchal Riaz]

Group 1 compounds have white colors, while the Group 2 compounds are colorless! Right?
Transition metal have colored compounds right?

no both 1 and 2nd group have white salts.
but CuO is black.
colorless means no fancy colors. very slowly cooled and pure crystals can be transparent also.

 

[Logitech]

Isn´t this supposed to be with cold dilute acidifed KMnO4?

oh yeah my bad.

 

[Haya Ahmed]

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

 

[itallion stallion]

Someone plz help me with this
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s13_qp_52.pdf
Q1cvi(I don't know what to do in this part).thanks!

 

[A star]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s04_qp_4.pdf Q2c(i) i get the answer but cant we state the size of carbon atom being smaller than silicon as a valid reason

 

[NinjaInPyjamas]

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

 

[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