Chemistry: Post your doubts here!

[♣♠ MagneD ♣♠]

den why did u ask me to ask u any thing related to biology coz u as u said " u kno everytin in biology" ???

hey i told i will tell u later.... rite now my mind has gone crazy..!! du tu studies plz... understand... m gonna tell u ...!!

 

[daredevil]

papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s10_qp_12.pdf
the 40th ques

sis 1st i do not know about biology... btw i will give ans tomorrow.. by deep thinking...

take this to the biology thread please

 

[Snow Angel]

hey i told i will tell u later.... rite now my mind has gone crazy..!! du tu studies plz... understand... m gonna tell u ...!!

yea i shall wait nd please reply to this ques on my wall.

 

[sitooon]

Can someone tell me how to draw the diagram for 1 (c)
and eg, of ONE method to prepare the concentrations ? in (d)

 

[bubbles1997]

Aoa. Can anyone please help me with Organic Chemistry. I spend 3 hours learning 2 chaps and the very next day, I have forgotten it... What should I do???

 

[♫Prince Shah♫]

Aoa. Can anyone please help me with Organic Chemistry. I spend 3 hours learning 2 chaps and the very next day, I have forgotten it... What should I do???

Write All the Concepts to remember them., and take the help from Youtube too

 

[salvatore]

http://papers.xtremepapers.com/CIE/...AS Level//Chemistry (9701)/9701_w12_qp_43.pdf
Could someone please help me with qn no. 4b (i)? I just don't understand what to do.
Thanks

 

[itallion stallion]

Can someone plz upload chemistry course book end of chapter question.thanks in advance

 

[ZaqZainab]

Can someone plz upload chemistry course book end of chapter question.thanks in advance

Do you want the question or the answers because for the questions you need to have the book but if you need the the answers here a link for the CD
http://www.mediafire.com/download/p7y1t3kp6iho7ma/%5BXPC%5DChemistry_Coursebook%5BVicBoss%5D.zip

 

[itallion stallion]

Do you want the question or the answers because for the questions you need to have the book but if you need the the answers here a link for the CD
http://www.mediafire.com/download/p7y1t3kp6iho7ma/%5BXPC%5DChemistry_Coursebook%5BVicBoss%5D.zip

Thanks a lot!!

 

[sitooon]

I have a question > When we want to use Bond energy of Cl2 >> as its quoted in the
Data booklet it should be 242 .. but for Many time i have seen that they are using 244 as the answer !
Why? which data should we quote if the question came to us ?
one of the questions is o'n 2009 va' 41

TheZodiac
6Astarstudent

 

[TheZodiac]

I have a question > When we want to use Bond energy of Cl2 >> as its quoted in the
Data booklet it should be 242 .. but for Many time i have seen that they are using 244 as the answer !
Why? which data should we quote if the question came to us ?
one of the questions is o'n 2009 va' 41

TheZodiac

I don't take chemistry.

 

[♫Prince Shah♫]

I finished my Chemistry in 20 DAYS..!!! still Getting about 30/60 (paper-2)
Getting WORRIED!

 

[funky brat]

I finished my Chemistry in 20 DAYS..!!! still Getting about 30/60 (paper-2)
Getting WORRIED!

Check for your weaker areas. Work on them. You would improve, Insha'Allah.

 

[♫Prince Shah♫]

Check for your weaker areas. Work on them. You would improve, Insha'Allah.

TY.

 

[6Astarstudent]

I have a question > When we want to use Bond energy of Cl2 >> as its quoted in the
Data booklet it should be 242 .. but for Many time i have seen that they are using 244 as the answer !
Why? which data should we quote if the question came to us ?
one of the questions is o'n 2009 va' 41

TheZodiac
6Astarstudent

keep in mind the data booklet each year are different versions, CIE may have slightly modified the data. Just use the data you get on the day of exam ie. the 2014 data booklet

 

[sitooon]

@

keep in mind the data booklet each year are different versions, CIE may have slightly modified the data. Just use the data you get on the day of exam ie. the 2014 data booklet

Resonable answer
another mark scheme answer which confuse me is :

conditions for changing methylbenzene to chloro methyl benzene as we know is : Uv light and reagent Cl2
but as the markscheme for mj2007 says , it should be Cl2 and hf ! >> whats hf hhh

 

[ZaqZainab]

@

Resonable answer
another mark scheme answer which confuse me is :

conditions for changing methylbenzene to chloro methyl benzene as we know is : Uv light and reagent Cl2
but as the markscheme for mj2007 says , it should be Cl2 and hf ! >> whats hf hhh

hf means high frequency

 

[TheStallion-Reborn]

Can someone tell me which chemistry books are good enough to really make a difference in the understanding?

 

[♫Prince Shah♫]

Can someone tell me which chemistry books are good enough to really make a difference in the understanding?

Coursebook is best.