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  1. K

    AS Biology P1 MCQs Preparation Thread

    guys do we need a ruler tell me please
  2. K

    AS Biology P1 MCQs Preparation Thread

    help may june 2007 q4
  3. K

    A level Biology: Post your doubts here!

    oct nov 2006 p1
  4. K

    A level Biology: Post your doubts here!

    oct nov 2006 q1 please
  5. K

    A level Biology: Post your doubts here!

    now helo
  6. K

    A level Biology: Post your doubts here!

    help urgent
  7. K

    A level Biology: Post your doubts here!

    The stage micrometer is replaced by a slide of a plant cell. 0 10 20 30 40 50 60 70 80 90 100 What is the width of a chloroplast? A 5 μm B 10 μm C 50 μm D 100 μm
  8. K

    Chemistry and Physics AS paper 12 MCQS

    please helppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp
  9. K

    Chemistry and Physics AS paper 12 MCQS

    On collision, airbags in cars inflate rapidly due to the production of nitrogen. The nitrogen is formed according to the following equations. 2NaN3 → 2Na + 3N2 10Na + 2KNO3 → K2O + 5Na2O + N2 How many moles of nitrogen gas are produced from 1 mol of sodium azide, NaN3?
  10. K

    Chemistry and Physics AS paper 12 MCQS

    2.76 g 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 organic product was then collected by distillation. The yield of product was 75.0 %. What mass of product was collected?
  11. K

    Chemistry and Physics AS paper 12 MCQS

    20 Use of the Data Booklet is relevant to this question. A sample of propyl ethanoate is hydrolysed by heating under reflux with aqueous sodium hydroxide. The two organic products of the hydrolysis are separated, purified and weighed. Out of the total mass of products obtained, what is the...
  12. K

    Chemistry and Physics AS paper 12 MCQS

    9701/12 Paper 1 Multiple Choice May/June 2012
  13. K

    Chemistry and Physics AS paper 12 MCQS

    Which molecule has the largest overall dipole?
  14. K

    Chemistry: Post your doubts here!

    nd pleaseeeeeeee may june 2006 q1
  15. K

    Chemistry: Post your doubts here!

    k wat abt very imp may june 2007 q9
  16. K

    Chemistry: Post your doubts here!

    k wat abt oct nov 2004 q31
  17. K

    Chemistry: Post your doubts here!

    k can u explaun now may june 2006 q10 also please
  18. K

    Chemistry: Post your doubts here!

    k wat abt may june 2006 q10
  19. K

    Chemistry: Post your doubts here!

    ooooooo is it becaause 1 mole of h2o gives 1 mole of hydrogen and half moles of 02 but isnt that principle only applies to kc not kp help thanx luk
  20. K

    Chemistry: Post your doubts here!

    thanx i love u but how did we get 0.1 i didnt get that thanx
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