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  1. drowning-in-studies

    Chemistry: Post your doubts here!

    How do you solve this?? Do you just add? Can someone pls explain each statement? The ans is D
  2. drowning-in-studies

    Chemistry: Post your doubts here!

    Ahh...I see Thanks
  3. drowning-in-studies

    Chemistry: Post your doubts here!

    36 Ammonia and chlorine react in the gas phase. 8NH3 + 3Cl 2 → N2 + 6NH4Cl Which statements are correct? 1 Ammonia behaves as a reducing agent. 2 Ammonia behaves as a base. 3 The oxidation number of the hydrogen changes. The answer is B I don't understand why 3 is false. Doesn't H change from +3...
  4. drowning-in-studies

    Please delete my account

    Please delete my account
  5. drowning-in-studies

    Chemistry: Post your doubts here!

    Thank you so much! :):)
  6. drowning-in-studies

    Chemistry: Post your doubts here!

    Oh...okay thanks :X3:
  7. drowning-in-studies

    Chemistry: Post your doubts here!

    Thank you :) That was a nice explanation! Do you know if this is out of the syllabus?:D
  8. drowning-in-studies

    Chemistry: Post your doubts here!

    Use of the Data Booklet is relevant to this question. 2.30g of ethanol were mixed with an excess of aqueous acidified potassium dichromate(VI). The reaction mixture was then boiled under reflux for one hour. The desired organic product was then collected by distillation. The yield of product...
  9. drowning-in-studies

    Chemistry: Post your doubts here!

    Lactic acid (2-hydroxypropanoic acid), CH3CH(OH)CO2H, is found in sour milk. Which reaction could occur with lactic acid? A CH3CH(OH)CO2H + CH3OH → CH3CH(OCH3)CO2H + H2O B CH3CH(OH)CO2H + HCO2H → CH3CH(O2CH)CO2H + H2O C CH3CH(OH)CO2H + NaHCO3 → CH3CH(ONa)CO2H + H2O + CO2 D CH3CH(OH)CO2H + Cl...
  10. drowning-in-studies

    Chemistry: Post your doubts here!

    A solution of Sn2+ ions will reduce an acidified solution of MnO4 – ions to Mn2+ ions. The Sn2+ ions are oxidised to Sn4+ ions in this reaction. How many moles of Mn2+ ions are formed when a solution containing 9.5 g of SnCl 2 (Mr: 190) is added to an excess of acidified KMnO4 solution? A 0.010...
  11. drowning-in-studies

    Chemistry: Post your doubts here!

    hehehe.. okay, Q 5 is very easy but sometimes i just freak out :p
  12. drowning-in-studies

    Chemistry: Post your doubts here!

    Okay thanks (y)(y)
  13. drowning-in-studies

    Chemistry: Post your doubts here!

    A solution of Sn2+ ions will reduce an acidified solution of MnO4 – ions to Mn2+ ions. The Sn2+ ions are oxidised to Sn4+ ions in this reaction. How many moles of Mn2+ ions are formed when a solution containing 9.5 g of SnCl 2 (Mr: 190) is added to an excess of acidified KMnO4 solution? A 0.010...
  14. drowning-in-studies

    Chemistry: Post your doubts here!

    How do you do Q 5 and 6?
  15. drowning-in-studies

    A level Biology: Post your doubts here!

    Thanks (y)
  16. drowning-in-studies

    A level Biology: Post your doubts here!

    How do you do this? Why isn't it B? The answer is C.
  17. drowning-in-studies

    A level Biology: Post your doubts here!

    When cylinders of potato tissue were immersed in a 0.35 mol dm–3 sucrose solution, they showed no change in mass. What will happen when cylinders are immersed in a 0.1 mol dm–3 sucrose solution? A The pressure potential of the cells will become more positive. B The solute potential of the cell...
  18. drowning-in-studies

    Physics: Post your doubts here!

    How do you revise for paper 3??? I'm going through marking schemes for limitations. Any other advise? :):)
  19. drowning-in-studies

    A level Biology: Post your doubts here!

    Oka-ay (y)(y)
  20. drowning-in-studies

    A level Biology: Post your doubts here!

    In question 26, Shouldn't water potential increase since amino acids are taken out, therefore making the solution less negative??? The answer is D.
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