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  1. H

    Which year's chem paper 2 was the most difficult?

    u cn also prepare by reacting directly with PI3 at rtp
  2. H

    reaction of ethanol with sodium uses!!!

    I WANNA KNOW can we use PCL5 to distinguish b/w carboxylic acid and alcohol???
  3. H

    reaction of ethanol with sodium uses!!!

    I WANNA KNOW can we use PCL5 to distinguish b/w carboxylic acid and alcohol???
  4. H

    reaction of ethanol with sodium uses!!!

    ethoxide ion soln has pH 14 !!!
  5. H

    reaction of ethanol with sodium uses!!!

    To dispose of small amounts of sodium safely To test for the -OH group in alcohols
  6. H

    infectious disease....

    u ll giv next year......
  7. H

    Your votes for the next XPF Moderators?

    nobodyy votes 4 me......:(
  8. H

    infectious disease....

    explain me factors that govern distribution of malaria
  9. H

    Observation of the reaction of period 3 elements

    mODERATORS.....MAKE IT STICKY............
  10. H

    Observation of the reaction of period 3 elements

    ORGANIC CHEMISTRY....somebody post details for preparation iodo----bromo----chloro alkanes giving all reagent and conditions..cos it cn come
  11. H

    Observation of the reaction of period 3 elements

    With sodium bromide What you see in this reaction are the steamy fumes of hydrogen bromide contaminated with the brown colour of bromine vapour. The sulphur dioxide is a colourless gas, so you couldn't observe its presence directly. SULFURIC acid behaved as ACID+OXIDISING AGENT wiTh sodium...
  12. H

    Observation of the reaction of period 3 elements

    guyx....make sure U Know how sulfuric acid reacts with sodium chloride...bromide and iodide REACTION WITH SODIUM CHLORIDE Concentrated sulphuric acid reacts with solid sodium chloride to produce hydrogen chloride and sodium hydrogensulphate.STEAMY fumes of HCl is all that is observed......in...
  13. H

    Urgent Help In Biology!!!!

    read from s-cool.co.uk
  14. H

    Which year's chem paper 2 was the most difficult?

    U tell me.....how to prepare a sample of iodobutane from butanol ?..conditions+reagents needed
  15. H

    Observation of the reaction of period 3 elements

    REACTIONS OF PERIOD 3 OXIDES WITH WATER.....remember AL2O3 AND SiO2 are insoluble in water Na2O(s) + H2O(l) → 2NaOH(aq) - pH 14 2MgO(s) + H2O(l) → Mg(OH)2(aq) - pH 9.....MgO is sparingly soluble P2O5(S) + 3H2O(l) → 2H3PO4(aq) SO3(g) + H20(l) → H2SO4(aq) Cl2O(g) + H2O(l) → 2HClO(aq)
  16. H

    Observation of the reaction of period 3 elements

    The vigour of the reaction increases across the period as the number of chlorine atoms attached increases. S2Cl2: Reacts violently, heat evolved, steamy fumes of HCl, SO2 produced. Complete hydrolysis; pH 0-2.Bad smell of SO2
  17. H

    Observation of the reaction of period 3 elements

    thats ok...bt i was talkin about reaction of chlorides and oxides with water.....let me chek my memory SODIUM CHLORIDE.......straight away dissolves to give salt solution of pH 7 MAGNESIUM CHLORIDE ...Again dissolves to give solution though partial hydrolysis occurs causing the pH of soln...
  18. H

    Observation of the reaction of period 3 elements

    now somebody post reactions with water.....and then we ll post organic reactions.....and NIBZ make it sticky...it ll be perfect to revise 2mrw niyt
  19. H

    bio...malaria.......lung cancer

    describe and explain how lung cancer develops
  20. H

    Observation of the reaction of period 3 elements

    If a stream of chlorine is passed over some heated sulphur, it reacts to form an orange, evil-smelling liquid, disulphur dichloride, S2Cl2.
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