CHEM UNIT 2!

[Manasa]

notes on organic chem?? pleasee!!!

 

[aligatorviper]

Im doing bio too!

so hwz ur prep. any idea wat shud b learned??

 

[saba1996]

so hwz ur prep. any idea wat shud b learned??

Not really good tbh! :/ I havent got enough time to do all the pastpapers.. i think ill do the latest exams only.... what about you?

 

[ithinkforit]

can anyone plz posts all da diagrams and apparatus for all da reactions in unit 2.

did u get it yet ?
i want them toooo

 

[ithinkforit]

Can someone post the diagrams and apparatus mostly used in unit 2.....or just name it plzz ???

 

[aligatorviper]

Can someone post the diagrams and apparatus mostly used in unit 2.....or just name it plzz ???

not yet dude.....i hope sum1 will post dem

 

[aligatorviper]

Not really good tbh! :/ I havent got enough time to do all the pastpapers.. i think ill do the latest exams only.... what about you?

same here..... only 1 day left.... and i still have some great ambiguities!!!!!
from which centre r u gonna appear and where?

 

[saba1996]

same here..... only 1 day left.... and i still have some great ambiguities!!!!!
from which centre r u gonna appear and where?

:'( and im not ready for chem too!!! Qatar, Al Arqam Academy.. you?

 

[saba1996]

Sorry guys I dont have ohter notes!!!

 

[aligatorviper]

:'( and im not ready for chem too!!! Qatar, Al Arqam Academy.. you?

giving chem as well??? i m also giving phy chem vid bio. at muscat....wat tym?

 

[Manasa]

help with oxidation and reduction topic in chem?? i dont understand it at all!!

 

[saba1996]

giving chem as well??? i m also giving phy chem vid bio. at muscat....wat tym?

yeah chem. i dont do physics though... bio at 11 and chem at 2;30

 

[A-level student]

Can some one plz give an explaination to these questions
The attached file Q6 , Q11d , Q13 ( how to know where is the top layer and which is the bottom using the density )

 

[ithinkforit]

notes on organic chem?? pleasee!!!

Yes please SOme notes on organic

 

[alex]

Can some one plz give an explaination to these questions
The attached file Q6 , Q11d , Q13 ( how to know where is the top layer and which is the bottom using the density )

6) The answer is B
CH4 is definitely not because it only contains london forces, the other 3 contain hydrogen bonds.
The answer is between HF or H2O and the answer is H2O because each H2O molecule forms 2 hydrogen bonds per molecule but HF forms only 1 per molecule
b)A
The molecular formula of the structure is C4H9I, C4H9Cl is not the answer because it has fewer electrons, hence weaker Van Der waals. So, this is between 1-iodobutane or 2-methyl-2-iodopropane. 1-iodobutane has a larger surface area than the more spherical structure of 2-methyl-2-iodopropane, hence the answer is 1-iodobutane

11d) Initiators are usually used for polymerization reactions, so i think it's B but i am not sure

13) The density of hydrocarbon layer is 0.660 g/cm^3 so it is less dense
An organic and an aqueous layer forms in the seperating funnel.
The density of the aqueous layer is close to the density of water which is about 1g/cm^3 so it is more dense than the density of the hydrocarbon layer, so it is below the hydrocarbon layer.

 

[A-level student]

6) The answer is B
CH4 is definitely not because it only contains london forces, the other 3 contain hydrogen bonds.
The answer is between HF or H2O and the answer is H2O because each H2O molecule forms 2 hydrogen bonds per molecule but HF forms only 1 per molecule
b)A
The molecular formula of the structure is C4H9I, C4H9Cl is not the answer because it has fewer electrons, hence weaker Van Der waals. So, this is between 1-iodobutane or 2-methyl-2-iodopropane. 1-iodobutane has a larger surface area than the more spherical structure of 2-methyl-2-iodopropane, hence the answer is 1-iodobutane

11d) Initiators are usually used for polymerization reactions, so i think it's B but i am not sure

13) The density of hydrocarbon layer is 0.660 g/cm^3 so it is less dense
An organic and an aqueous layer forms in the seperating funnel.
The density of the aqueous layer is close to the density of water which is about 1g/cm^3 so it is more dense than the density of the hydrocarbon layer, so it is below the hydrocarbon layer.

Thank u sooooooooooo much

 

[qstar.inc]

helpful

There you go!

 

[aligatorviper]

guys wat do u ppl say will iodometric titration cum 2moro or acid base......
wat r ur predictions and how difficult da ppr is gonna be???//

 

[za Shadow]

can someone plzzz help me with some questions:

Q10 Q11 Q15 and Q16

http://www.edexcel.com/migrationdoc...2000/June 2011 - QP/6CH02_01_que_20110527.pdf

One more thing, plzzzz provide me with notes on "Mass and infrared spectrometry" i don't understand it at all :'(

 

[LittlePixelz]

can someone plzzz help me with some questions:

Q10 Q11 Q15 and Q16

http://www.edexcel.com/migrationdocuments/QP GCE Curriculum 2000/June 2011 - QP/6CH02_01_que_20110527.pdf

One more thing, plzzzz provide me with notes on "Mass and infrared spectrometry" i don't understand it at all :'(

Q10. D-- because butan-1-ol can be fragmented at CH3CH2CH2 to give an m/e value at 43, which is not possible in butan-2-ol

Q11. C-- not too sure why, but I guess it's because there are 3 main elements, hence there will be 3 molecular ion peaks, since both isotopes of Bromine combine to form one major molecular ion peak for Bromine

Q15. B-- because ethylamine cannot form when the reactant is a methane group. The methane can be repeated when it replaces one H atom from NH3, but it will increase by methyl groups only. 1-methyl, dimethyl, trimethyl etc.

Q16. C-- since the TOTAL percentage error has to be calculated (for measuring out NaOH and acid), multiply the accuracy of the pipette by 2 (i.e. 0.04*2= 0.08). Then divide by the total amount that is measured out (i.e. 10 cm3+ 10 cm3) and multiply by 100, to give +-0.4%

Hope you could understand