Balkazrar

maybe you can prove this by using logorythm tables but those are extinct i say go with what eveyone says cos72=cos2(36) but without a calculators is very much impossible for most since we have no values to work with and no idea what cos36 is.

i reacted h2o2 and copper sulphate ,what i got was a murky green solution with bubbles being formed should this be so?if so can you point me to some law or theory which may tell me why..thanx to all in advance.

thanx O3 for the links (and i already did the experiment just so u know.)

can you please tell me or lead me to where i can find how the sulphuric acid contridute to oxidisation of alcohol.Becuase all i know it dehydrates the alcohol(or at least that is what i have found on the net) which makes no sense to me.

In school we did a lab where we oxidized ethanol and buthanol.Both gave vinegar after the reactions were complete.The acohols were oxidised with potassium dichromate and sulphuric acid.I have no idea what the acid is for and why did buthanol give vinegar.Can someone help me?