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why is there a restriction for rotation??* A restriction for the bonds to rotate, thus becoming less flexible.
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why is there a restriction for rotation??* A restriction for the bonds to rotate, thus becoming less flexible.
for the time part be as deft as possible and should practice titration as much as u can in the laboratory along with the calculations becz there just is no other way to perfect it....regarding chemistry as level practicals, how are we supposed to estimate the rough titre? and how to manage time with doing the experiment as well as doing the calculations? please answer as possible. thanks in advance.
why is there a restriction for rotation??
Well, dont know if im right so if im not please do correct me!
Its because when you have double bonds like in ethene, the pi system (which has a pi lobe above and below the plane) doesn´t allow rotation because there is no space for it to rotate (since its occupied by the pi lobe)
why is there a restriction for rotation??
yes the restriction is there because of pi-bondWell, dont know if im right so if im not please do correct me!
Its because when you have double bonds like in ethene, the pi system (which has a pi lobe above and below the plane) doesn´t allow rotation because there is no space for it to rotate (since its occupied by the pi lobe)
yes the restriction is there because of pi-bond
think of it as a ball and it is inserted with a stick like in lollipop....but not stuck so if you spin it, it will spin in it's place but now if you attach two sticks with it, the ball wont spin any more because if it tries to rotate around one stick the other will stop it! so it's movement have been restricted!
that is the image i have of it in my mind
ooohh i got it thankks!! )...and i guess that if you want that rotation to occur you will have to break the pi system, and that requires energy. I´m not sure about this, so if anyone knows the answer please do say it.
thank you very much, i shall try it next time when im practisingfor the time part be as deft as possible and should practice titration as much as u can in the laboratory along with the calculations becz there just is no other way to perfect it....
furthermore... where choosing the rough titration value u let the titre pour into the the titrant at a steady stream and keep looking at the titrant. as soon as it changes colour close the tap. the reading u get here is the rough titration value and is more often than not larger than the actual titration result. this reading gives u an idea about where ur actual value will lie. e.g. if the rough value = 27cm3 u can reduce the stream to drops when u reach let's say 20cm3 so that u can later close the tap exactly when the titrant changes colour. i hope it's not too confusing
Q1. the mass that is given is the mass of Ag so use it to find out the moles of Aghttp://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w07_qp_1.pdf
Plz help with Q1, 10, 19 and 37
can you please post the MS@sidbloom1995
they said that the gas is evolved and to check the identity of the gas, they tested it with filter paper dipped into acidified potassium dichromate(VI), and the colour changed from orange to green.http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s11_qp_21.pdf
A2 part a.. how is it sulphur dioxide in MS..
anyone?????
you have to look at the data provided in the table
ooooooooooooooooooooooooooooooo i seeeethey said that the gas is evolved and to check the identity of the gas, they tested it with filter paper dipped into acidified potassium dichromate(VI), and the colour changed from orange to green.
this is particularly the test for SO2 gas and it's result tell us that the gas evolved it SO2
i know that you will be confused because normally speaking when we react Cu with H2SO4 we get CuSO4 and H2, but not all of the H2SO4 will undergo the same reaction and some will react differently, forming a different product
and one more thing, your question is from O level this is A level doubt post (i dont mean it in a rude way, just informing you )
is that for the answer or for informing you that it is A level post? -_-ooooooooooooooooooooooooooooooo i seeee
Answeris that for the answer or for informing you that it is A level post? -_-
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