Chemistry: Post your doubts here!

[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

 

[cool.hamza3]

i am expecting 45/60 do i still have a chance to get A??

 

[A star]

i am expecting 45/60 do i still have a chance to get A??

anythng above 42- 44 is ok which i guess is the general threshold

 

[muhammad05]

Alhamdulliah it wasn't as bad as expected. I expected freaking organic all over the place and hybridization. I'm worried about p1 now...

 

[Browny]

Can anyone tell me the weightage for P1 and P4 for mathematics?

 

[muhammad05]

60:40

 

[Browny]

60:40

What is 60 and what is 40?

 

[Snowysangel]

What was the value of x??

 

[Browny]

For the practical paper can we get to test for gases other than NH3 and how to test for them?

 

[zain ul abidin]

What was the value of x??

x=2

 

[Mohammed salik]

Is this V1? bcz i got X=1 For Variant One !

x=2

 

[cosmicT]

Can someone give me an estimated grade threshold for the current (2014) chemistry paper 2

 

[EmiraS]

I got x=1, what about you?

 

[Logitech]

Does anyone have any idea about the questions for p31 practical ?

 

[Snowysangel]

x=2

But wasnt the no of moles of the compound = 6.3/0.01, since there were 0.05/5=0.01 moles of it