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  1. Saturation

    Practical papers graph qs

    Hello all! Straight to the point: 1) Is it all right to use a PENCIL to mark the scales and the axes headings on a graph ? I've been using a pencil all this time, until i read in the syllabus (chem) : "The presentation medium should be pencil for lines on tables and graphs" Using a pen for the...
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    AS Physics Practical Sig.Figures Qs.

    Hello everyone! I would like to know how many significant figures OR decimal places we are required to give numerical answers, to the more "general" questions in PAPER 3. e.g. In may/june 2010, P31...
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    Post your marks :)

    Physics A* Chemistry A* Mathematics A* Geography A* Environmental Management A* Travel and Tourism A* English 1st Language A* ICT A* English Literatre B A very sincere Thank you goes out to everyone for all their help and advice!
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    chemistry paper3 (AFTER EXAM DISCUSSION)

    Quick doubts: Which experminet was faster? The one which was with copper right? And why was it that experiment?? I wrote cause copper conducts heat better than plastic :roll: The balacing of the final equation? (methanoic acid + calcium carbonate)? I just guessed... :shock: For the type of...
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    Potassium permanganate

    Hi all! I know Potassium permanganate is an oxidising agent, which can turn ethanol into ethanoic acid, but i want to know what the colour change is? It changes from purple to ??? Thanks all and good luck for tomorow! :lol:
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    WHO CAN SOLVE THIS MOLE question???

    Tough qs! btw has this ever come in a past papers? and is it likely that they could ask something like this!? :S
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    Chemistry Excess reactions

    Anyone? :shock:
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    Chemistry Excess reactions

    Hi everyone! Can someone please explaning to me how to calculate excess amounts in reactions such as Question 7 in this paper: http://www.xtremepapers.net/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w08_qp_03.pdf Thank you guys! :mrgreen:
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    Physics paper1: the discussion.

    What about the resultant forces question!? The one where they ask which is true for a moving object? Overall it was a good paper!
  10. Saturation

    Types of current AC/DC

    Well it's for Physics CIE 0625
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    Types of current AC/DC

    Ok, i know that there is only one type of AC----> alternating current, which flows backwards and forwards, which is generated from generators. But for DC i know that there's steady DC, Varying DC. Varying DC comes from AC which has been rectified right? Can someone enlighten me about the forms...
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    chemistry paper1 (after exam discussion)

    2124 :D
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    Chem paper 1 ques + others

    Thanks for both of ur replies! :) but when you add NaOH to a calcium containing compound, a white precipitate of calcium hydroxide is formed. So doesn't that mean it's insoluble?
  14. Saturation

    Chemistry paper1 [discussion here] after exam

    Im sure its 2124... btw what was the 1st qs, the one with the molecules above the tea? Its move faster and further apart right?
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    Chem paper 1 ques + others

    CAn someone pls explain to mw how to do qsuestion 11? http://www.xtremepapers.net/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_w07_qp_1.pdf I dont unerstand it! :? :? :? And if Aluminium is placed in an acid, will it react? I m guessing no, because of the protective oxide coating on the...
  16. Saturation

    If sulfates are soluable then how.......

    QS 2 You missed the last part! : "He adds magnesium carbonate until no more reacts."!:D Which means he'll have to first FILTER the excess! Then he'll carry out evaporation and crystallization! So it will be "C" QS 23 Copper is a very unreactive metal. It' won't react with acids since it's below...
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    Potential Dividers (Explanation pls!)

    Thanks SuperXDE! Hopefully it will :D!
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    Potential Dividers (Explanation pls!)

    Hi everyone! Can someone please explain to me the concept of potential dividers, especially when you use a thermistor and LDR?? Thank you so much! :P Cheers!
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    word limitssss!!!!!!!!!!

    Just stick to around 2 A4 size papers! Im not sure about counting the "I" and all. I dont think they count those...
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    Chemistry Paper 12 Nov 09 Qs (Electrolysis)

    Whoops! Sorry! Oh in that case it makes sense!:), but i never knew that chlorine could bleach a Universal Indicator solution! Guess i know now! Thank you! :) :) :)
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