Recent content by rebedotcca

  1. R

    Chemistry It's all about moleeeeeees.

    Hey fightfish. For question 1 i had solved it already. But now i'm having problem with question 2. I do not know how to start this question. Do you mind teaching me? Thanks!
  2. R

    Chemistry It's all about moleeeeeees.

    1) Sulphur dichloride oxide, S02Cl2 is hydrolysed (decomposed) by water to sulphuric acid and hydrochloric acid. A sample of S02Cl2 was dissolved in sufficient water to produce 150 cm3 , and of the 25cm3 of the resultant solution required 15cm3 of 0.2 mol/dm3 sodium hydroxide for neutralisation...
  3. R

    Proving trig identities!

    1) 1-tan^2x ________ = cos2x 1+tan^2x LHS : [1 - (sin^2x/ cos^2x) ] / [ 1 + (sin^2x/cos^2x)] = [(cos^2x -sin^2x)/cos^2x] X [cos^2x/(cos^2x + sin^2x)] = (cos^2x - sin^2x) / (cos^2x +sin^2x ) (Rmb cos^2x + sin^2x =1 ) = cos^2x -sin^2x =...
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