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    Chemistry help

    Why is that...can you explain?
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    Chemistry help

    In some fireworks there is a reaction between powdered aluminium and powdered barium nitrate in which heat is evolved and an unreactive gas is produced. What is the equation of the reaction A 2Al +Ba(NO3)2 ---> Al2O3 + BaO + 2NO B 4Al + 4Ba(NO3)2 ---> 2Al2O3 + 4Ba(NO2)2 + O2 C 2Al + 3Ba(NO3)2...
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    AS Level Statistics Question p6

    A bag contains 7 orange balls and 3 blue balls. 4 balls are selected at random from the bag, without replacement. Let X denote number of blue balls selected. I want to find P(X=1) and P(X=2) Can someone explain to me how it is done please? Nov 2001 p6 Q7
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    IGCSE english Literature questions

    I need to practice answering passage based questions for the short stories. does anybody know a good site to practice these questions?
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    Maths question O/N 2012

    it is Q4b (iv) and (v) http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Mathematics%20(0580)/0580_w12_qp_42.pdf
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    ICT HELP?!

    http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Information%20and%20Communication%20Technology%20(0417)/0417_s12_qp_32.pdf It is question 23-28 when i do it in microsoft picture manager it doesnt resize properly and can you explain step 27 where you have to resize the browser so that the...
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    IGCSE LITERATURE HELP

    Well it depends on the question. I might sometimes write even 1 and a half pages but it should be absolutely revelant to the question. And sometimes i do 2 pages or even more. I would recommend going for essay question in the poetry part and the passage based question for the strory and play (I...
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    Physics, Chemistry and Biology: Post your doubts here!

    A relay Remember, a relay always controls a larger current. A relay is a switch based on the principle of an electromagnet and when the smaller current flows through the coil the electromagnet would work and attract an iron armature on a pivot, closing contacts in a second circuit witch would...
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    IGCSE LITERATURE HELP

    I am doing my IGCSE literature this session May/June 2013 and I am confident I can secure either an A or an A*. However I need some help in some of the short stories: My Greatest Ambition and The custody of the pupkin. I will be attempting the passage based question so if you guys have any notes...
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    Chemistry paper 3 confusing question...Help!?

    I still dont understand mate...The question stated that the HEIGHT of the precipitate was 16mm(not the amount) If you could do this question in steps, it would be great.
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    Chemistry paper 3 confusing question...Help!?

    Hello...I have a chemistry question. It is Q5b M/J 2009 http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s09_qp_3.pdf The markscheme doesn't say much...so I'm pretty lost about this question..can you help me out?
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    Physics, Chemistry and Biology: Post your doubts here!

    Hello...I have a chemistry question. It is Q5b M/J 2009 http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s09_qp_3.pdf The markscheme doesn't say much...so I'm pretty lost about this question..can you help me out?
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    Physics, Chemistry and Biology: Post your doubts here!

    Hello...I have a chemistry question. It is Q5b M/J 2009 http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Chemistry%20(0620)/0620_s09_qp_3.pdf The markscheme doesn't say much...so I'm pretty lost about this question..can you help me out?
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