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  1. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Ur checking the wrong ms.. i guess! :)
  2. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    It's D! Check the marking scheme again..
  3. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    The answer should be B.. potassium will replace hydrogen from HCL when a metal alone, potassium hydroxide or potassium carbonate.. forming potassium chloride!
  4. salvatore

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Thanks mahn..
  5. salvatore

    ANSWERING ALL BIO/CHEM PAPER 1 DOUBTS :)

    Please explain the answer.. super confused!
  6. salvatore

    POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

    Please explain this answer.. super confused!
  7. salvatore

    Chemistry P31

    100%.. *High five* :p
  8. salvatore

    Chemistry P31

    Salt acts as a catalyst & speeds up the rusting process!
  9. salvatore

    Chemistry P31

    Yeah thats correct.. but u gtta convert it to 2(1:1.5:1) = 2:3:2
  10. salvatore

    Chemistry P31

    It clearly said silver (I) chloride.. so its AgCl
  11. salvatore

    Chemistry Doubts: IGCSE Paper 3

    The ms says: correct repeat unit (one or more whole repeat units must be given) [1] cond continuation The repeat unit is the bond after each carbon atom.. the continuation part is the 'n' outside the bracket
  12. salvatore

    Chemistry Doubts: IGCSE Paper 3

    Make sure u break the double bond, show a repeating unit & include 'n' outside the brackets..
  13. salvatore

    Chemistry Doubts: IGCSE Paper 3

    One H2O is H-O-H. If u break that up, u get (H-O)(H-O). So one H2O = 2(H-O).. and 2H2O = 4(H-O). CH4 is just 4(C-H). Hope this helped!
  14. salvatore

    Chemistry Doubts: IGCSE Paper 3

    Yeah.. that's possible. But.. prevention is better than cure! :p
  15. salvatore

    Chemistry Doubts: IGCSE Paper 3

    Hehe yeah.. but CIE is quite unpredictable! Check dis out; qn. 5 (b).. http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s07_qp_3.pdf
  16. salvatore

    Chemistry Doubts: IGCSE Paper 3

    Hey.. I don't understand how cathodic protection of iron/steel works. My text book says that the iron/steel should be the anode.. but here, http://en.wikipedia.org/wiki/Cathodic_protection it says that it should be the cathode. Could someone please explain that + how the cathodic protection...
  17. salvatore

    Physics, Chemistry and Biology: Post your doubts here!

    Thanks for ur reply.. I think u looked at the wrong question. Its qn 5 (b), regarding metal T & Na3PO4
  18. salvatore

    Physics, Chemistry and Biology: Post your doubts here!

    Hey guys.. please help me with question 5 (b) in http://www.xtremepapers.com/papers/CIE/Cambridge%20IGCSE/Chemistry%20%280620%29/0620_s09_qp_3.pdf I'm totally confused!
  19. salvatore

    Physics really needed thinking

    Dunno.. possibly yes
  20. salvatore

    Physics really needed thinking

    The electrons were removed from the air molecules.. making them positively charged. I think so!
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