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Everything posted by ChemSiddiqui

  1. I am not sure if this is right or not, but if i recall correctly double bonds also influence viscousity. There are more double bond in the organic oil while in water there are none, even though it is polar, oil is more viscous. Forgive me if i am wrong though!
  2. Fair enough then, I was only trying to help the OP though !
  3. I am sure in most text books about inorganic chemistry they give a mnemonic which will help the OP to remember which sub-shell is filled first. As per why one orbital is filled first compared to the other the answer is simply low energy orbitals are filled first. hope that help OP a bit.
  4. This type of structures are called skeletal structure. You might like to google how to deduce the MF from these type of structure. Good Luck!
  5. well yeh, but i dont know the language. Its not just about reading the Quran but understanding it and I sadly dont always read it, but ocassionally and if i have to look at the translation its in english ofcourse. O well, i gotta go loads to do. Take care and bye

  6. ChemSiddiqui

    QM Cat!

    Ok, a bit of fun and also information; "What's the story behind Schrödinger's Cat?" Please share!
  7. Hi bookworm,

    Sorry to dissapoint but I dont understand what you wrote to me. I do know it arabic but there u go I dont know the language. What does it mean to say anyway!. Got to go now, take care. bye!

  8. Exactly what i want to say. It is not as if I am not grateful to him for writing such a lengthy post but I know these stuff already. the only thing i wanted to ask was the magnitude/strength of the forces and I got the help I wanted. But lets give the person some credit for trying to help out.
  9. thanks a lot hemanntrude. i had been searching/googling it as magnitudes of intermolecular forces but got nothing relevent so thanks! really appreciate ur help1
  10. Ok i got a question(again)! What are the forces that hold the molecule together to form a liquid? Look up examples of the magnitude of these forces and give value in kj/molecule! Thats the part i am stuck in, how can i possibly know the magnitude or hydrogen bonds, london forces etc. Can anyone help!
  11. A good idea will be to draw a born cycle before making any calculation. What you do then is that use the forumula: Enthalpy of formation = sum of all other entalphies(including Lattice enthalphy). now try to do it yourself and see if the answer comes out right. hope i have helped
  12. Hi vedmencum, Thank you for your answer but like I said i know about electronegativity already its just that i was asking about suggestion about what to write as an answer. Yes, pauling scale is the one mostly used but its empirical , mullikans scale(which takes the average b/w the IE and electron affinity) can give numerical values....except for noble gases. Thank anyway
  13. Yeh I know,


    Basically I took it as an elective (u get options to subject other than chemistry, just 2 and the most interesting I found was astronomy and mathematics) others were computer and things like that that didn't suit my taste so I went for astronomy and math. Math was fine, infact it was fun but astronomy turned out to be my worst nightmare but there i am now. But its pure chemistry I am doing yeh for the degree.

  14. ok i am just going to express my views on the post by the OP and because I haven't read through to the last of the thread do forgive me if the discussion is over. I am Muslim and In Quran it is mentioned that any one living in state of non-Muslim will have to abide by the rules of the country given it doesn't in any way interfere with his religion. I live in the UK and a Muslim and I dont find that law here is in any way stopping Muslims to practice their religion and by practicing religon I don't mean 5 times prayers etc, no there is moe to Islam than that, humanity is first always in front of God and any person(Muslim) taking oath by siging any legal document will have to abide by it and try to sort out the problem that are facing the society. But Taking oath from a Quran is optional, if one thinks that he really must not stray from his/her duties and wants to take oath under Quran so that it is in his mind that any wrong doing on his part will be questioned by God(after the involvement of Quran) in my opinion is perfectly ok. I hope the same goes for people of other faiths as well. sorry sometimes writing length post confuses me so if they are mistakes in the post it simply my bad.
  15. hi there bookworm,


    I am keeping very busy with the exams. they finish this friday. i had one today of chemistry but the one on friday i am certain to fail because its astronomy so pray for me if you will. But can u image a chemistry undergraduate studying astronomy?


    ok good luck got to go now. take care and good luck with ur studies

  16. 1st order reaction will have a rate equation like; r = k[X] 2nd order will have the rate equation like r=k[X][Y] or r=k[X]^2 Order is the power that is raised in the concentration term in a rate equation. If the concentration term(s) have power 1 then the reaction is first order, 2nd if the concentration term(s) have total power of 2. The equation of the form r=k[X] is usually called the rate equation or rate law. The thing is that they are many chemical reactions around and it is difficult to characterise all of them according to speed so kinetist(sorry do know the spelling) have come up with way with which the chemical reaction behave. for example the first order reaction could be in plenty amount but any rection that is first order will have rate decreasing exponentially with time. and simliarly for 2nd order the rate will increase with time. hope that helps somewhat. Good luck!
  17. The thing that you need to look for in your text book or simply google it is " Electronic Configuration". This is the most common topic among chemistry book where you have to give the electronic configuration or else guess what element or ion has a particular EC. I will give answer to your first question but forgive me the forums rules don allow me to help you completely unless I or anyother member sees that you have tried to solve the problem and have not merely asked them!. 2,8,8,2 means that there are 2 electron in the first shell followed by 8 in the second and again 8 in the third and then 2 in the fourth and last shell. Remember the valence electron (the no of electrons in the last shell) should direct you to the group from which the element is. For example, in the element has 2 electrons in the final shell so it must be from he 2nd group and adding the number of electron up makes 2+8+8+2 = 20. In a neutral atom, no of electron are similar to no of proton so look in the periodic table and Ca should have this electronic configuration.
  18. Some one asked me this (above)question and thats what i had to say about it; HF is a molecule in which F is more electronegative than H, that is, F has a higher tendency to attract electron than H, so the cosequence is that this molecule has a dipole, negative over F and positive over H. B:--> H--------F --------> BH+ + F- (I hope you can imagine the arrows and dipoles over HF molecule) A nucleophile attach the H dipole and the bond breaks heterolytically so that both electron in the bond go to the same atom in this case to flourine. I was going fine until here and got stuck as to how to explain further. I will appreciate any comments from you users. I get the feeling i must mention the conjugate base!?
  19. appreciate the reply, but that is not what i am looking for as the answer. I wanted to ask what to write for the answer instead of the dependence of the EN. But, thanks very much for reply .
  20. well, i only know YT through his threads and replies to my question and I find that he could be ideal choice for president. Needs I say whom i voted for...?
  21. ok we need to develop this, when dealing with nucleophilic aromatic substituion, the electron withdrawing group will infact activate the ring towards the nucleophilic substituion but they still direct the substituent towards the meta position. is this what you wanted to ask?
  22. Apply "4n+2" or Huckel's rule for planar ringed organic compound. if the number of pi electrons and lone pair agrees with the huckels rule then the compound is aromatic.
  23. ok this is from a past-paper; Describe the different ways in which the electronegativity of an element has been defined. I don't know what to answer. I think maybe the question is asking about the pauling, mulliken and allfered-rochow electronegativity values but i can't be sure. Any help on what the question is asking and what should i write.
  24. I think I can, Muslims are Muslims. Any killing freak or something like that isn't a Mulsim no matter if he calls himself a Muslim. I rest my case. Anyway enjoy Christmas.
  25. Hello all, From all the Muslims and myself in the world I would like to wish all you, a very happy Christmas and wishes of a wonderful new year!. Merry Christmas;)! Hopp in on the peace train! ChemSiddiqui
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