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  1. E

    Physics, Chemistry and Biology: Post your doubts here!

    ok so for group 1 metals the density increases as we go down but for the rest it increases as wel go down....
  2. E

    Physics, Chemistry and Biology: Post your doubts here!

    Does density increase or decrease as we go down group 1,2,3,4,5,6,7,8 Thx
  3. E

    Physics, Chemistry and Biology: Post your doubts here!

    C as when anything containing a nitrate ion is heated with sodium hydroxide and aluminium powder/foil , it forms ammonia gas which turns red litmus blue
  4. E

    Physics, Chemistry and Biology: Post your doubts here!

    yea CL went and its NaOH at cathode as the Na is at cathode and the OH moves towards the cathode to form NaOH which is basic.....my teacher just said metals are like nasty things who do not like to move and the OH ions float around towards these nasty things and form NaOH
  5. E

    Physics, Chemistry and Biology: Post your doubts here!

    chlorine goes out as it is concentrated leaving OH ions behind and H ions go away leaving the Na and the NaOH is there at the cathode which goes blue/purple as it is basic.....
  6. E

    Physics, Chemistry and Biology: Post your doubts here!

    yea think so ....
  7. E

    Physics, Chemistry and Biology: Post your doubts here!

    because monatomic gases are the noble gases(unreactive) and they do not react as they already have 8 valence electrons......so they are unrective....so its C
  8. E

    Physics, Chemistry and Biology: Post your doubts here!

    galvanisation is coating a metal with like zinc to stop rusting and steel mainly contains iron with some carbon and the zinc coz its galvanized therefore its D I dont know about the other question sry....
  9. E

    Physics, Chemistry and Biology: Post your doubts here!

    C as when anything containing a nitrate ion is heated with sodium hydroxide and aluminium powder/foil , it forms ammonia gas which turns red litmus blue :)
  10. E

    Physics, Chemistry and Biology: Post your doubts here!

    sry I was wrong Look there is loads of hydrogen produced and since H2SO4 releases the most Hydrogen when electrolysed that is the answer Cu SO4 H OH There is only 1 H compared to S or O Na Cl H OH There is only 1 H compared to the other which is either O or CL H SO4 H OH Notice there are...
  11. E

    Physics, Chemistry and Biology: Post your doubts here!

    yr still really good at chem :) :D wayyyy better than I am :D
  12. E

    Physics, Chemistry and Biology: Post your doubts here!

    no precipitate is formed and gas formed at - electrode so it has to be sulphuric acid :)
  13. E

    Physics, Chemistry and Biology: Post your doubts here!

    B is 2,5 C is 2,8,2 which is correct
  14. E

    Physics, Chemistry and Biology: Post your doubts here!

    http://wiki.answers.com/Q/Does_adding_water_change_the_pH_of_an_acid Yea it does increase :)
  15. E

    Physics, Chemistry and Biology: Post your doubts here!

    dilute acid so I think it does but Im not so sure....
  16. E

    Physics, Chemistry and Biology: Post your doubts here!

    when u draw the whole molecule, there are 17 pairs of bonds(1 pair = 1 line) so yeah u add them up and they add up to 17
  17. E

    Physics, Chemistry and Biology: Post your doubts here!

    yea lol I failed XD
  18. E

    Physics, Chemistry and Biology: Post your doubts here!

    I dont know for the first one.... 2nd I think its B and third A
  19. E

    Physics, Chemistry and Biology: Post your doubts here!

    did u encounter any hard questions on paper 1 that I could try to help revise myself? Thx
  20. E

    Physics, Chemistry and Biology: Post your doubts here!

    I found paper 3 really easy but I kinda found paper 6 confusing :(
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