- Messages
- 2,824
- Reaction score
- 3,730
- Points
- 273
Hahaha rightt my badd lol!
"oh simple things, where have you gone"
haha "I'm getting old and I need something to rely on"
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)
Hahaha rightt my badd lol!
"oh simple things, where have you gone"
16: Ahttp://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w12_qp_11.pdf
Can anyone solve Q:11,15,16,17,20
16: A
becz if all three of these elemts wen pput in that case do have lone electron pairs. but not all of them increase by 1. NO --> NO2 here N increases its ox state by 2.
20. D
just count all the double bonds (3) for pie bonds
then the single bonds. remember to count C-H bonds n -CH3 also bcz htat is a possible over look u might do. it will help if u mark with a pencil the bonds u have counted. also count one sigma bond for all the double bonds too bcz first a sigma bond is made and then a pie bond so they do have a sigma bond too. they are 25 in total.
don't know the others well enough to tell u sorry.
what didn't u understand? pin point the confusion so maybe then i can clear it out for unot understand yet
Make sure you use the correct units.
It doesn't necessarily have to be on the right or left side; it'll be on the side of the -CO2. For example, an ester will be like this: acid-CO2-alcohol, or alcohol-O2C-acid. The C of the CO2 will be part of the c. acid.
yeah so in part D isnt that the acid after CO2 instead of the alcohol :/
so yeah they're saying that Y reacts with ethanol..and if Y is an hexanoic acid..shouldnt it have 6 Cs rather then 3D is: CH2CH2CO2(CH2)4CH3. C is: CH3(CH2)4CO2CH2CH3 The underlined parts are from the carboxylic acids. D's is propanoic acid and C's is hexanoic acid. In the question, we start of with hexanol, with is then oxidised to hexanal, and then to hexanoic acid.
so yeah if the acid is hexanoic acid it should have 6 carbons..but in D it has only 3
oh yeah! omg i was looking at the wrong question in the ms this whole time..sorrryy! loolThat's why D is not the correct answer.
Q13- all are soluble except CaCO3 so only it will precipitatehi guys im facing some problems in mcqs somebody plzz help
q 13, q 20, may june 09 p01
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s09_qp_1.pdf
could u please elaborate on that, i am still confused.there is no affect of the Cl-Cl bond or Br-Br bond here. The main bond here is H-Cl and H-Br. U should refer to there bonds to answer the question. Bond energies are diff according to the elements they are bonded to so we cant relate Cl-Cl and Br-Br to H-Cl and H-Br
can someone help me with these this is my chem the question might be a piece of cake for any of u
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s06_qp_1.pdf
Q 5, 6, 11, 33 the N=N bond point 2 can be right too, and 40
thanks in advance
paper 1:
s08: Q.6,8,27,29,30,38 http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s08_qp_1.pdf
w08: Q.21,29,30,39 http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w08_qp_1.pdf
plz help me, ty.
For almost 10 years, the site XtremePapers has been trying very hard to serve its users.
However, we are now struggling to cover its operational costs due to unforeseen circumstances. If we helped you in any way, kindly contribute and be the part of this effort. No act of kindness, no matter how small, is ever wasted.
Click here to Donate Now