Chemistry P1 and P2 today

[asma tareen]

Well, hoping for A*'s in these CIE's. INSHA ALLAH. Thanks for the complement.
Yeah, two things;
- No aluminium was mentioned.
- They asked the TWO ions that were present in the compound.
Gave off the answer to be Ammonium ion and Metavanadate ion.

haye mery poutey ki taareefen

 

[Shadow]

That's not the case either, even an ordinary house-hold scanner can scan the images quite clearly. They use much better scanners.

indeed ... i just did not want to take any chances in the ppr

 

[UFO_far_planet]

Not exactly. But I'm 500% sure the moles of Products were more. That's why I opted for a decrease in pressure. Adding a reactant won't change the state of equilibrium.

It will change. Even i found it to be HCl.

 

[Mohammad Farzanullah]

what was the answer of the mcq in which we had to separate gas Z from X,Y and Z? the one in which a diagram was given!
I did D bcoz Oxygen was insoluble!

 

[passion hunter]

Answer of the last question's last part was 4200kJ right?

i got 4200kj but people are saying 4700...dont know how

 

[Saad Mughal]

what was the answer of the mcq in which we had to separate gas Z from X,Y and Z? the one in which a diagram was given!
I did D bcoz Oxygen was insoluble!

Nitrogen, Oxygen and Hydrogen all three are insoluble. You had to look for the option in which the other two gases would be separated which was A - Hydrogen, Carbon Dioxide and Nitrogen. Hydrogen reacted with the copper (II) sulphate, Carbon Dioxide was absorbed by the NaOH and only Nitrogen passed on through to the collection tube.

 

[passion hunter]

I attempted this question and my answer was .4 g I think. From the graph the volume of CO2 evolved was 96 cm. So the moles of CO2 would be 96/24000=.004 moles
In the next part as the molar ratio of CaCO3 to CO2 is according to this equation CaCO3 + 2HCl=CaCl2 + H2O + CO2 1:1 so
0.004 * CaCO3 MR
0.004 *100=0.4 g

i did it the same way...''high five''

 

[Saad Mughal]

i did it the same way...''high five''

Everyone did it the same way.

 

[Saad Mughal]

Marshall Cavendish.

I'm sorry but I can't find any reason why you're method is wrong; are you sure that you're applying it correctly? Are you sure that the mass of the tablet was 0.5 g?

 

[asma tareen]

I'm sorry but I can't find any reason why you're method is wrong; are you sure that you're applying it correctly? Are you sure that the mass of the tablet was 0.5 g?

:i guess i reaD THE WRONG VALUE FROM GRAPH

 

[Saad Mughal]

:i guess i reaD THE WRONG VALUE FROM GRAPH

Aww. Daadi.

 

[Mohammad Farzanullah]

Nitrogen, Oxygen and Hydrogen all three are insoluble. You had to look for the option in which the other two gases would be separated which was A - Hydrogen, Carbon Dioxide and Nitrogen. Hydrogen reacted with the copper (II) sulphate, Carbon Dioxide was absorbed by the NaOH and only Nitrogen passed on through to the collection tube.

this is all the fault of the book from which i studied!
it does not have nitrogen in the solubility list! i only memorized that H2 and O2 are insoluble while all others are soluble!

 

[Saad Mughal]

this is all the fault of the book from which i studied!
it does not have nitrogen in the solubility list! i only memorized that H2 and O2 are insoluble while all others are soluble!

Well, I didn't study the solubility of gases, but I knew which ones were insoluble. Although, I didn't even take in account the solubility of the gases in the MCQ!

 

[asma tareen]

Aww. Daadi.

mery value ke marks katy ge ya the whole question

 

[Mohammad Farzanullah]

Saad Mughal
what did u choose for the mcq in which it was asked about the direction of charges in the heating element?

 

[Saad Mughal]

mery value ke marks katy ge ya the whole question

Values.

 

[Saad Mughal]

Saad Mughal
what did u choose for the mcq in which it was asked about the direction of charges in the heating element?

I chose one direction.

 

[asma tareen]

Values.

kitny

 

[Mohammad Farzanullah]

I chose one direction.

reason?

 

[Saad Mughal]

kitny

I'm not an examiner you know.