-
We need your support!
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
Chemistry: Post your doubts here!
- Thread starter XPFMember
- Start date
- Messages
- 249
- Reaction score
- 90
- Points
- 38
- Messages
- 77
- Reaction score
- 11
- Points
- 18
hey can anyone hel me in this ques its from oct nov 2012 p41 
- Messages
- 1,882
- Reaction score
- 1,331
- Points
- 173
- Messages
- 561
- Reaction score
- 733
- Points
- 103
help plzzz 9701/4/s02 chemistry 4(c) why there is no rxn between fe3+ and chlorine??
- Messages
- 1,824
- Reaction score
- 949
- Points
- 123
Well since it's a ketone .. it needs to be a secondary alcohol and for it to be secondary alcohol there needs to be atleast 3 C atoms... And if you drew the isomers in 5b correct you will have.. HCO2OC3H7
the last part is from the alcohol .. so there are 3 C in this alcohol
The formulae for secondary alcohol would be...
(CH3)2CH(OH) Answer
I guess, It would be Suspect 2 because 3 of the DNA bands are matching with the crime scene '1' however , suspect 1 has only one complimentary DNA band
- Messages
- 1,824
- Reaction score
- 949
- Points
- 123
I have copy pasted this answer from another thread.. it was given by xHazeMx
the metal could be from group 1,2,3 or 4, having either oxidation number +1 or +2 or +3 or +4. so if u look to the values given
v= 0.05 dm^3
c= 0.10 mol dm^-3
then, n= c x v , 0.10 x 0.05 = 0.005 moles
also,
v= 0.025 dm^3
c= 0.10 mol dm^-3
then, n= c x v , 0.025 x 0.10 = 0.0025 moles
so to know whether this metal is from group 1 or 2
divide the number of moles u got
0.005/0.0025 = 2 .... This shows that the metal is from group 2. Hence, oxidation number is +2
(correct me if i m wrong)
v= 0.05 dm^3
c= 0.10 mol dm^-3
then, n= c x v , 0.10 x 0.05 = 0.005 moles
also,
v= 0.025 dm^3
c= 0.10 mol dm^-3
then, n= c x v , 0.025 x 0.10 = 0.0025 moles
so to know whether this metal is from group 1 or 2
divide the number of moles u got
0.005/0.0025 = 2 .... This shows that the metal is from group 2. Hence, oxidation number is +2
(correct me if i m wrong)
- Messages
- 561
- Reaction score
- 733
- Points
- 103
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s09_qp_2.pdf
paper 21,help with no 5a n hw do i solve similar problems??? syed1995
paper 21,help with no 5a n hw do i solve similar problems??? syed1995
- Messages
- 20
- Reaction score
- 34
- Points
- 13
the answer can be CH3CH2CH2CH2COCH2OH. as they v told to add an OH bond it is added . remaining C valency is satisfied by keeping in mind tht the product would contain double the amount of C,H,and O.so a ketonic group is added also.
- Messages
- 1,824
- Reaction score
- 949
- Points
- 123
I still don't get it. What reaction is it going through? reduction? how would one assume that which equation would be made like why is it ketone+alcohol?
- Messages
- 20
- Reaction score
- 34
- Points
- 13
they v said in the qs tht no other product is formed and two moles of the original compound should form one single new compound. now it is up to us to add such groups in the compond formed tht C,H and O no should be equal to double of C,H and O in original compound . and it is compulsory to add an OH group , they v mentioned it .
- Messages
- 561
- Reaction score
- 733
- Points
- 103
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w10_qp_23.pdf
4cii Can sum1 show in details?
4cii Can sum1 show in details?
well in 4cii they are basically asking us to draw the structure of butdiene as one Cl and hydrogen will be removed from one end and one Cl and hydrogen from other forming CH2=CH2-CH=CH2