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  1. Z

    AS MATHS!

    Which units are you looking for?
  2. Z

    C3 may2012 preparation.

  3. Z

    C3 may2012 preparation.

    Any specific examples you want? Straight Lines Curves from x^2 Curves and Inflexion Points from x^3 Transformations: f(x+a) => Subtract a from all X-Values f(x-a) => Add a to all X-Values f(x/a) => Multiply all X-Values by a f(ax) => Divide all X-Values by a a+f(x) => Add a to all Y-Values...
  4. Z

    How was C2?!

    Volume of Cylinder = πr^2h It was given as 60mm^3 πr^2h=60 h=60/(πr^2) A = Total Surface Area = 2πr^2 + 2πrh *r=x A = 2πx^2 + 2πx(60/(πx^2) A = 2πx^2 + 120/π <= This was shown
  5. Z

    How was C2?!

    No, because (1-5Cos2x) to be = 0 Let Cos2x = Y (1-5Y)=0 1=5Y Y=1/5 Cos2x = 1/5
  6. Z

    How was C2?!

    Yes: Tan2x = 5Sin2x Sin2x/Cos2x = 5Sin2x Sin2x = 5Sin2xCos2x Sin2x - 5Sin2xCos2x = 0 Sin2x(1-5Cos2x) = 0 <= This was Given
  7. Z

    How was C2?!

    That means you used a different method for Question 1 and did not use the given result (which you should have found in Question 1) and did not get all the Solutions.
  8. Z

    How was C2?!

    For that question I found 5 Answers for X Modify Range since it is for 2x => 0≥2x≤360 Sin2x = 0 Cos2x = 1/5 2x=0°, 180°,360° 2x = 78.5°, 281.5° Final Solutions of X=0°, 39.3°, 90°, 140.8°, 180° All must be in 1 Decimal Place
  9. Z

    How was C2?!

    Value of X for Cylinder is 2.122 Minimum Area = 84.84 = 85 (Nearest Integer) Perimeter = 5+5+(5*1.855)=19.275 Sum of nth Terms is the Proof: 1. Sn=a+ar+ar^2+...+ar^(n-1) 2. rSn=ar+ar^2+...+ar^n 1. - 2. = a-ar^n Sn(1-r) = a(1-r^n) Sn = (a(1-r^n))/(a-r)
  10. Z

    How was C2?!

    It was very easy.
  11. Z

    How is your preperation for Chem Unit 2 ???

    C-Cl C-F C-Br C-H
  12. Z

    How is your preperation for Chem Unit 2 ???

    Yes, it is necessary to add a "-" sign on the complex. Complex must be in square brackets. SN1 shows the removal of the Halogen and the ADDITION of the OH- group
  13. Z

    How is your preperation for Chem Unit 2 ???

    No catalyst is needed Just the Steamy White Fumes formed when put with Ammonia Fumes a white precipitate forms.
  14. Z

    How is your preperation for Chem Unit 2 ???

    2P (Red Phosphorus) + 3I2 > 2PI3 HalogenoAlkane + PI3 > IodoAlkane + H3PO3 Balancing is required
  15. Z

    How is your preperation for Chem Unit 2 ???

    Do I have to know to describe this in any kind of question?
  16. Z

    How is your preperation for Chem Unit 2 ???

    Thank You :)
  17. Z

    How is your preperation for Chem Unit 2 ???

    Can someone please tell me everything what we have to know about London Forces, Instantaneous Dipoles and Induced Dipoles?
  18. Z

    How is your preperation for Chem Unit 2 ???

    An example can be CH4
  19. Z

    How is your preperation for Chem Unit 2 ???

    Only Methyl Orange, Litmus and Phenopthalein
  20. Z

    How is your preperation for Chem Unit 2 ???

    Why does the Hydrogen Bond in H2O is 180 degrees? The answer is just to Maximize Separations and Minimize Repulsions?
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