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Search results
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how was chemistry p42?
so there was 0.o5 mol(and not 0.5) in 100cm3 ? M - molar concentration ,right? -
how was chemistry p42?
guys for the pH question. was it 100cm^3 of 0.5moldm^-3 acid or simply 0.5mol in 100cm^3? -
how was chemistry p42?
probably cuz most carbonate are insoluble in water. since caco3 is slightly soluble in water some co32- would be formed and pbco3 and bac03 would be precipitated. i`m not sure about this though -
how was chemistry p42?
no3- = fertiliser po43- = detergent so2 = contact process difficulty in removing no3- = all of its compounds are soluble in water . cannot be precipitated ion removed on addtion of caco3 = ba2+ and pb2+ though i found it strange that there was both ba2+ and so42- interaction = van der waals... -
how was chemistry p42?
what answer did you get i got 3.68 using (0.03 nah and 0.5 acid) but if it was actually 0.3 naoh in 0.5acid then you would get 5.05 -
how was chemistry p42?
as far i remember, 0.03 mol of naoh was added to 0.5 mol of acid. but since yo guys are saying they had the same number of dp, i guess i messed up. -
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how was chemistry p42?
hey guys how many mol of naoh was added in the pH question was it 0.3 or 0.03? -
how was chemistry p42?
so what did you guys get as pH , mass in partition coefficient question and enthalpy change for chlorine and iodine question? and also for the two organic questions what did you get as the OTHER products? i wrote nacl and nh4oh( 1 H missing to form h20) -
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how was chemistry p42?
no discussion is allowed before 24h but i`ll atleast say this. i think what you are saying only applies to the atomisation enthalpy. let X J be the bond energy of bond X-Y.regardless of whether another bond is breaking or forming, X J is required to break 1 mole of the bond X-Y and thats it. -
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how was chemistry p22?
lol a piece of cake is the poll title. hahaha. i guess i really am a dumb idiot. -
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CHEMISTRY P22!
in the question about the 3 isomers of cyclopropane , did u guys draw optical isomers too cuz i only found 2 structural isomers? -
Physics Paper 22 Nov 2013! How was it?
u are confusing displacement with distance traveled. anyways u r right , it was only worth 1 mark :D -
Physics Paper 22 Nov 2013! How was it?
if by displacement you mean amplitude , then the amplitube was 20mm . A traveled 80mm in one complete oscillation ( 1 oscillation = max position to min and then back to max position = 4 amplitude) mean to crest = 1st amp crest to mean = 2nd amp mean to tough = 3rd amp trough to mean = 4th amp... -
how was physics p22?
speed 7.5 yea but the distance 120m is probably right. speed was 3x10^8ms and time taken for wave to travel from initial point to reflector and then back to initial point was 0.8x10^-6 s . v=d/t ---> d=240m. distance of reflector from initial point = 240/2 --> 120m -
how was physics p22?
question was about the pulse right? if so most got the distance = 120m -
physics 22
i think u can break the charge into two: 1.+ve vs -ve charge 2.mag of charge on alpha = 2x charge on beta 3. different mass