Chemistry: Post your doubts here!

[maq1996]

Um lol.. I don't know what she was talking about. Seriously

 

[MYLORD]

Um lol.. I don't know what she was talking about. Seriously

Me ????!!!

 

[maq1996]

Yeah.. about chemical shifts..

 

[MYLORD]

Yeah.. about chemical shifts..

See this #8649

 

[AbbbbY]

how did you guys find p.22?

Has to be the easiest P2 I've seen in a long time. Calculations were easy as was the organic. Infact, organic on this paper was childsplay tbh. Recent papers have had so much tougher organic questions.

 

[maq1996]

Has to be the easiest P2 I've seen in a long time. Calculations were easy as was the organic. Infact, organic on this paper was childsplay tbh. Recent papers have had so much tougher organic questions.

What was the Ar by the way??

 

[AbbbbY]

By the way what was the Ar of A? Was it boron? Iykwim

10.8

Hey guys, what if I balanced my equations but i didnt balance it in the simplest form, will i still get the mark?

If you used fractions, yes. If you used decimals, no.

What was the Al2o3 + nacl?

Al2O3 + NaOH -> NaAlO2 + H2O
The first step of this is also acceptable, in that,
Al2O3 + NaOH -> Al(OH)3 + Na

If I write the correct skeletal formula for the wrong ketone will I get a mark?

I don't think. Ecf doesn't come into play here. Usually.

 

[ruler_of_the_world]

OMG maan, thankyou so freaking much!!! By now I didn't know that we were given the shifts in the booklet!! JazakAllah bro!

What r u talking abt ?
''Chemical Shifts''??!!

Exactly my question!!

This is for all the people who have been wondering what the chemical shifts are.
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_y14_sy.pdf
This is the link to the 2014 syllabus. Now go onto page 83 which is part of the Data Booklet which we will get during the exam. On this page as you can see clearly the chemical shifts are given which are basically to identify which groups are present in the NMR.

 

[Anees2rehman]

Hi,
im expecting a 46/60 in todays paper. Im really worried, do i still expect
to get an A???

 

[AbbbbY]

Hi,
im expecting a 46/60 in todays paper. Im really worried, do i still expect
to get an A???

A vast percentage of your grade is P4 so you can even get an A* if you ace that.

 

[Zepudee]

10.8



If you used fractions, yes. If you used decimals, no.
Abby, but hmm, all the numbers are times three. Like hmm, you get it?not fractions, but times three like that


Al2O3 + NaOH -> NaAlO2 + H2O
The first step of this is also acceptable, in that,
Al2O3 + NaOH -> Al(OH)3 + Na



I don't think. Ecf doesn't come into play here. Usually.

 

[Zepudee]

im not used to their organic chem ques today hahaha

 

[Snowysangel]

10.8



If you used fractions, yes. If you used decimals, no.



Al2O3 + NaOH -> NaAlO2 + H2O
The first step of this is also acceptable, in that,
Al2O3 + NaOH -> Al(OH)3 + Na



I don't think. Ecf doesn't come into play here. Usually.

Did we have to name A?

 

[Suchal Riaz]

i am really happy. please pray i get a distinction or two.

 

[mynameisnotneeded]

10.8



If you used fractions, yes. If you used decimals, no.



Al2O3 + NaOH -> NaAlO2 + H2O
The first step of this is also acceptable, in that,
Al2O3 + NaOH -> Al(OH)3 + Na



I don't think. Ecf doesn't come into play here. Usually.

Wut? But my textbook says Al2O3 + NaOH(aq) = NaAl(OH)4
Lemme explain. As the NaOH is aqueous, some water takes part in the reaction too...

 

[A star]

was it hard or easy cant any of the As people make up your mind -________-

 

[Suchal Riaz]

Wut? But my textbook says Al2O3 + NaOH(aq) = NaAl(OH)4
Lemme explain. As the NaOH is aqueous, some water takes part in the reaction too...

both are correct. NaAlO2 is anhydrous form of NaAl(OH)4

 

[cool.hamza3]

what will be the threshhold??

 

[Suchal Riaz]

what will be the threshhold??

i guess about 70% or less

 

[mynameisnotneeded]

was it hard or easy cant any of the As people make up your mind -________-

Some people find organic easy. Some people find periodicity easy. It all depends on the person...
It was an average paper IMO. Neither too hard, nor too easy. I did well