CHEM AND BIO HELP AND TIPS HERE

[The Golden Girl =D]

explain plz i m sry i m realli dumb

ethanol..................draw them and u'll kno what i'm talkin abt

By the way no one is dumb 

[Vin]

can u plz explain y this thank u any1
 

there is no equation as such .. Fe₂O₃.xH₂O because the water content is not the same in all cases

Rusting requires
CO2
H2O
O2

[Baladya]

there is no equation as such .. Fe₂O₃.xH₂O because the water content is not the same in all cases

Rusting requires
CO2
H2O
O2

c02? why would u need that?

[Shazizzzle]

Can someone explain Q4, 22 of w08 paper, thanks

For Q4, recall that IONIC COMPOUNDS are SOLUBLE in water while COVALENT COMPOUNDS are NOT.
In the first method, X, i.e the ionic salt, will dissolve in the water, as is soluble, leaving Y behind.
Y, as a solid residue, may be obtained via filtering, where X is in solution.

In method 2, Usually both DO NOT dissolve in ethanol.

So only method one is workable, thus the answer is B.


In Q22,
experiment 1 is a simple test for the presence of ammonium ion. recall that sodium hydroxide is added to an ammonium containing compound. Alkaline ammonia gas will produce on heating, turning the red paper blue, and the other blue will remain blue.
In experiment 2, a soluble salt CANNOT react with an acid, so no reaction, thus no change in colour of litmus paper.
Thus ans is D.

[Ivo]

explain plz i m sry i m realli dumb

C, because has formula: C2H5OH

[Vin]

explain plz i m sry i m realli dumb

   
     H   H  
     |    |        
H - C - C - O - H
      |   |      
      H   H  

ETHANOL C₂H₅OH

[Baladya]

Yo noobs go to sleep we are failing anyways xD 

Lol m gonna stay for another half an hour Anyone wants to ask ?

[The Golden Girl =D]

Yo noobs go to sleep we are failing anyways xD 

Lol m gonna stay for another half an hour Anyone wants to ask ?

nah actually i'm going to bed

Talk to you later people of this universe 

[Ivo]

For Q4, recall that IONIC COMPOUNDS are SOLUBLE in water while COVALENT COMPOUNDS are NOT.
In the first method, X, i.e the ionic salt, will dissolve in the water, as is soluble, leaving Y behind.
Y, as a solid residue, may be obtained via filtering, where X is in solution.

In method 2, Usually both DO NOT dissolve in ethanol.

So only method one is workable, thus the answer is B.


In Q22,
experiment 1 is a simple test for the presence of ammonium ion. recall that sodium hydroxide is added to an ammonium containing compound. Alkaline ammonia gas will produce on heating, turning the red paper blue, and the other blue will remain blue.
In experiment 2, a soluble salt CANNOT react with an acid, so no reaction, thus no change in colour of litmus paper.
Thus ans is D.

Ok, I get 22.  BUt for 4, why in MS it says A?  So apparantly ionic salts are not soluble in ethanol butr organic covalent are?   

[Baladya]

Ok, I get 22.  BUt for 4, why in MS it says A?  So apparantly ionic salts are not soluble in ethanol butr organic covalent are?   

yes

[NidZ- Hero]

ethanol..................draw them and u'll kno what i'm talkin abt

By the way no one is dumb 

but dat dumb ms is sayin its ethene i noe i m nt dumb was makin sure of de answer

[Shazizzzle]

Ok, I get 22.  BUt for 4, why in MS it says A?  So apparantly ionic salts are not soluble in ethanol butr organic covalent are?   

So, apparently, COVALENT ORGANIC COMPOUNDS are SOLUBLE in ETHANOL! :S

[Ivo]

So, apparently, COVALENT ORGANIC COMPOUNDS are SOLUBLE in ETHANOL! :S

Can anyone explain why ionic are insoluble and organic covalent are soluble in ethanol?

[Baladya]

Can anyone explain why ionic are insoluble and organic covalent are soluble in ethanol?

Somestuff my son, can't be explained -.- >.< Seriously, why do u want to confuse ur self? I don't think anyone here knows why cuz its so detailed... U dont need to know

[the_grim_reaper]

Can anyone explain why ionic are insoluble and organic covalent are soluble in ethanol?

Yar Shaz guide parh guide!!!!

@ VIN why is CO2 needed for rusting? Heard it for the first time in my  life ....