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  1. Saturation

    Can someone give me a set of temperature readings?

    Can some one please give me a set of temperature readings for this Chemistry practical, cause i wan't to work on the graph and all!: Question (b): http://www.xtremepapers.me/CIE/Internat ... _qp_31.pdf Thank you! :)
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    Mathematics 9709 paper 12 how was it with you?

    Ahk! I couldnt get how to solve the quadratic qs at all during the exam! :( It turns out to be a really simple qs! :( :( Messed up on the angle with the x-axis question as well, and the f^-1, postion vector of OD... And I gave only 1 solution for the cos^2 question! Gonna loose like 15 marks...
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    Guess the least marks for A grade

    Whats the lowest mark ever for an A in previous maths papers?? :Search:
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    Guess the least marks for A grade

    I hope somwhere 55/75! It was tough! anyone know what the lowest gt for an A has been?
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    MAths P1 Trigonometry help!

    Ahk! I'm sorry, I mean LEFT hand hand side! :fool: How do you do it??
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    MAths P1 Trigonometry help!

    Question 2: http://www.xtremepapers.me/CIE/Internat ... _qp_12.pdf The mark scheme doesnt make sense! I would like to know how you do it starting from the right hand side! Thanks!
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    matrix method to find area

    I don't get your method, but if you want to find the area of a shape on a graph, the method I typed above works. And it works for other shapes aswell, not only triangles! (I'm not sure if there are limitations, but it definitely works for a rhombus, so I'm guessing other shapes too.) And btw I...
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    matrix method to find area

    I'm not sure if this is the matrix method, but I'm guessing this is it: You have a shape on the graph. You need the coordinates of the Vertices. Assume you have a triangle with vertices: x1,y1 x2,y2 x3,y3 you write it down like this: x1 x2 x3 x1 (Notice that you repeat...
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    maths urgent help P1 w-10 paper 11

    First expand (1 + ax)^6 , until you get to "X" : 6C0*1^6* (ax)^0 + 6C1* 1^5 * (ax)^1 + .... = 1 + 6ax + .... (we don't need to continue expanding cause we already got to the term with "X") So it says the coefficient of "X" = 30 Therefore, 6a = -30 a= -5 Now it becomes: (1 -5x)^6 Find the...
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    P1 June 2009 Q4-ii

    Actually using the range involving 12.57 is part of solving the trigonometrical equation! If you use another method to solve trigonometrical equations, stick to it! This is how I solve them. And btw, i haven't heard of the double angle formula, so yeah, if you use another method, use that, but...
  11. Saturation

    Maths Mechanics (M1) question!

    ohh! ok Makes sense! but how are supposed to know that the resultant acts in the middle of the hypotenuse and perpendicular? Is it because this is a pulley?
  12. Saturation

    Maths Mechanics (M1) question!

    Thanks for the detailed reply!, but I don't get how you get the angel 30? Is that angel PAN?
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    Maths Mechanics (M1) question!

    http://www.xtremepapers.me/CIE/Internat ... _qp_43.pdf Question 3 part (i) Can some one please explain how to do it? :Search:
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    Hydrogen Iodide reducing agent? AS theory!

    It says in the book, that hydrogen Iodide is the least stable hydrogen halide. that makes sense, but it says that it can act as a strong reducing agent!? Can someone explain please? Thank pou!
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    P1 June 2009 Q4-ii

    See, you just form the equation when y = 0 : 6sin(2x)+3 = 0 6sin(2x) = -3 sin(2x)= -3/6 = -0.5 Then solve it like a normal trignometrical equation, and use the smallest value for x! sin ( A ) = -0.5 2x = A therefore 0 =< A =< 12.57 A = sin inverse -0.5 = -0.523 ( which is out of...
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    P4010 and sulfur trioxide polarity!

    But wikipedia says its' boiling point is 45 degrees C! http://en.wikipedia.org/wiki/Sulfur_trioxide
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    P4010 and sulfur trioxide polarity!

    Hi! Is P4010 (phosphorus oxide) and sulfur trioxide (SO3) polar? oh, and sulfur trioxide is a liquid at room temperature? Thanks! :Bravo:
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    Chem 33/34 Practical Guesses Discussion

    Paper 31 ! Anyone??!
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    final final details abt practicals!

    guys, anything about paper 31 for chemistry and physics? :roll:
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    any expected phy and chem practical 2011???

    Anything for Paper 31?
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