Chemistry: Post your doubts here!

[Charchit]

Yeah, maybe on extraction of Aluminium? Cause like the diaphgram cell for brine has came out quite a number of times already

Heyy, Can you help me explaining induced-dipole/dipole-dipole bonds???? Cannot understand them!!! Freaking Out here

 

[Natitah18]

Heyy, Can you help me explaining induced-dipole/dipole-dipole bonds???? Cannot understand them!!! Freaking Out here

Well basically from what I understand is that the are between polar compounds. Take for example NH3, the N is delta negative (highly electronegative in this case) and H is delta positive (less electronegative). There's 3H and 1N, 3 against 1 so no cancel out, hence there's a dipole. Correct me if I'm wrong

 

[Natitah18]

how do we know they are going to arrange themselves 180 degree apart?

When there's two electron pairs and both are used for bonding and hence zero lone pair. So you get a linear shape of angle 180. Futhermore, there's no lone pair to cause distortion. Hope that helps!

 

[Camille96]

Hey guys, what do you do when you lose motivation? I did some dumb mistakes on that paper today, i feel bad.

 

[princess Anu]

When there's two electron pairs and both are used for bonding and hence zero lone pair. So you get a linear shape of angle 180. Futhermore, there's no lone pair to cause distortion. Hope that helps!

when we draw the structure of I3- we get 3 lone pairs not zero

 

[huh]

Hey guys, which is the most trickiest and hardest MCQ PAPER 1 past papers have you found? Thanks in advance.

 

[animesh]

can any one upload notes for paper 4 plz i got an exam tomorrow

 

[perpetuallystressed]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w11_qp_43.pdf

I need help in 3(e)(iv)! I don't know how to get [CH3CO2Na] & [CH3CO2H].

 

[emilyy]

Hey guys, what do you do when you lose motivation? I did some dumb mistakes on that paper today, i feel bad.

same here
feelng rlly bad

 

[RoOkaYya G]

btw for kp wht answer u guys got?

 

[Camille96]

What is the difference between subsituted amide and simple amide? I'm confused

 

[Natitah18]

btw for kp wht answer u guys got?

I sat for paper 23, my ans is something x10^-13. Its a really small number, not sure if its correct. How about you?

 

[RoOkaYya G]

I sat for paper 23, my ans is something x10^-13. Its a really small number, not sure if its correct. How about you?

i sat for p22 :S

 

[Logitech]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w11_qp_43.pdf

I need help in 3(e)(iv)! I don't know how to get [CH3CO2Na] & [CH3CO2H].

I know the formula for the pH and I managed to get the concentration for the salt, but I cant get the concentration for the acid. If anybody else could help...

 

[Bilal Khan]

btw for kp wht answer u guys got?

I got wrong due to mistake in moles , otherwise the question went fine .

 

[ahmed butt]

how to study for 9701 chemistry as level

 

[♣♠ Magnanimous ♣♠]

how to study for 9701 chemistry as level

How to study means wat
Just read book twice or thrice and by completing chap by chap solve topicals of that chapter simple.
Your concepts are clear than you will ace As level easily

 

[abdul moeed rana]

I got wrong due to mistake in moles , otherwise the question went fine .

moles kia ha answer mein,matlab wats the right answer.

 

[Eyunice]

21 Tetramethyl-lead(IV), (CH3)4Pb, increases the rate of the reaction of methane with chlorine.
CH4(g) + Cl2(g) → CH3Cl(g) + HCl(g)
Why can tetramethyl-lead(IV) behave in this way?
A It is a source of methyl radicals.
B It releases CH3+ .
C It reacts with chloromethane and prevents equilibrium being established.
D Metal ions catalyse the reaction.

Ans : A

_9701_s07_qp_1
Question 20

Explain pls

 

[ahmed butt]

How to study means wat
Just read book twice or thrice and by completing chap by chap solve topicals of that chapter simple.
Your concepts are clear than you will ace As level easily

thx bro