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  1. D

    Harder 3 Unit Questions

    yep, its easier if u draw a graph for (ii)
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    general conics questions i cant do

    the first one u can dy/dx both side and sub in Y,X value to find dy/dx other questions just simply differentiate and sub in the correspond value
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    Volumes Query

    yes, you definitely can
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    Stronger acid

    i guess they are the same they both ionise 100%
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    Titration

    Same was watching titration on YouTube..
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    Titrations - Determing Strong/Weak Acids/Bases

    Ok..i found my notes on Stong/Weak acid or base Common Stong acids: hydrocholoric acid sulfuric acid nitric acid Weak acids (decreasing order of acid strength) : oxalic acid hydrogensulfate ion phosphoric acid hydrofluoric acid ethanoic acid carbonic acid hydrogen sulfide dihydrogenphosphate...
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    Titrations - Determing Strong/Weak Acids/Bases

    Strong acids are: HCl, H2SO4, HNO3 Any acids other than those are Weak acid H3PO4 is said to be triprotic although it is Weak acid Indicator: Stong acid + Stong base <---Use bromothymol blue Stong acid + Weak base <---Use methyl orange Weak acid + Stong base <---Use phenolphthalein
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    need note 4 china coin

    Can anyone plz send me a copy of their notes for The China Coin..Thanks! dongerluo@hotmail.com
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    question 7 + 8

    for Q8 part c i wrote t=2kpi/n where k=0,1,2,... i think it make sense :(
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    Question 5-6

    i got exactly the same thing! ^@^
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