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Chemistry: Post your doubts here!

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goodluckayesha said:
Plz someone solve my doubts:

1. papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w03_qp_4.pdf for this one explain Q4ci and 4cii and also in question one i had a doubt regarding if we can use tollens, K2Cr2O7 smthn like tht as well?
2. http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w05_qp_4.pdf
Q5ci plz explain
3. and i wanted to ask is there a difference between H3O+ and H+ because for hydrolysis of amide diff ms have diff so if they r different when do we use each of them?
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2) its the same thing H3O or H+(aq) if you use the latter then the state symbol becomes essential otherwhise it will be taken as a free radical or nascent hdrogen
 
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itallion stallion said:
Can u help me how to do q1 b II.i just don't know where would a coordinate bond be formed,other question like it where we have to form double bond! Are there any specific examples which I should learn or just try my luck in the paper!
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its usually common sense you have too apply in this one its common knowledge the NH4+ has a dative covalent bond (H atom donates to Cl-. in others for example CO you have no choice but to draw a simple double bond it would be accepted (mind you the structure is abit different in reality but not needed by cie) and try t see if the valency is being satisfied or not
 
itallion stallion

itallion stallion

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A star said:
its usually common sense you have too apply in this one its common knowledge the NH4+ has a dative covalent bond (H atom donates to Cl-. in others for example CO you have no choice but to draw a simple double bond it would be accepted (mind you the structure is abit different in reality but not needed by cie) and try t see if the valency is being satisfied or not
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Do u have any examples of compound which have coordinate bond,double bond etc along with their structure!thanks
 
itallion stallion

itallion stallion

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abruzzi said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w10_qp_41.pdf
Please help me with qn no. 5b(iii). How do you know the structure?
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Read the details given in the question for the compound.
It says it gives white ppt with Br2 aq means it will have a phenol.gives yellow ppt with tri idoform test means there will be COCH3 group present and it is mentioned that it is 1,4 di substituted.so phenol at 1 and COCH3 at 4.got it!
 
Aaquib Khalid

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Could anyone tell me how to calculate the number of carbons present in the mass spectra when the relative height of the M and M+1 peaks are given as 9 and 0.3? And also how does when the abundance has been given in place of relative height?
 
Jelleh Belleh

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itallion stallion said:
I can't relate the cathode equation with overall Eo.u must be having the same problem!
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nope i got that . i know the problem but am ignoring it for the sake of getting the paper done . the overall Eo value is not the same as that of a lead-acid battery. what i caannot get is the last part shouldnt the the over E0 change be O
 
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