Chemistry: Post your doubts here!

[The Sarcastic Retard]

What is the Ans?

Answer is C.. it cant be A.. Its covenant and metallic respectively.
In C both is mettali.

 

[nehaoscar]

Answer is C.. it cant be A.. Its covenant and metallic respectively.
In C both is mettali.

What about B and D?

 

[The Sarcastic Retard]

What about B and D?

A : Al = Metallic; P = Covalent.
B : Cl = Covalent(Diatomic) ; Ar = Van der waals force (Noble gas)
C : Mg = Metallic ; Si = Covalent.
D : S and Cl have covalent bonds.. Its D.

 

[shazmina]

A : Al = Metallic; P = Covalent.
B : Cl = Covalent(Diatomic) ; Ar = Van der waals force (Noble gas)
C : Mg = Metallic ; Si = Covalent.
D : S and Cl have covalent bonds.. Its D.

thats what i was wandering ... it cant be C ... and the ans is D

 

[shazmina]

http://freeexampapers.com/A-Level/Chemistry/CIE/2002-Nov/9701_w02_qp_1.pdf
Question 11 .. help please ...

 

[The Sarcastic Retard]

thats what i was wandering ... it cant be C ... and the ans is D

I am sorry, I didn't read the question properly plus got on with the flow!!

 

[shazmina]

View attachment 54479
What would each one give?

Ans C?

 

[shazmina]

I am sorry, I didn't read the question properly plus got on with the flow!!

And i think the ans was even marked wrongly on the question ... and its okay

 

[The Sarcastic Retard]

http://freeexampapers.com/A-Level/Chemistry/CIE/2002-Nov/9701_w02_qp_1.pdf
Question 11 .. help please ...

A?

 

[The Sarcastic Retard]

And i think the ans was even marked wrongly on the question ... and its okay

Thats what i meant by saying got on with the flow.. xD

 

[shazmina]

A?

even i thought A .. but the ans is D :/

 

[shazmina]

Thats what i meant by saying got on with the flow.. xD

Loooooooooooooooooooool

 

[The Sarcastic Retard]

even i thought A .. but the ans is D :/

I got D...
Wait..

 

[nehaoscar]

And i think the ans was even marked wrongly on the question ... and its okay

Yeah sorry it is D!

Ans C?

Yes it's C... what would the reactions be?

 

[The Sarcastic Retard]

Loooooooooooooooooooool

Kp = p(H2)*p(I2)/p(HI)^2

If x mol of HI dissociates then you get x/2 mol of I2 and x/2 of H2. Also the amount of HI left is (b-x) mol.

Substitue the values.

Kp = p(x/2)p(x/2)/p(b-x)^2

Simplify it :

Kp = px^2 / 4(b-x)^2

 

[shazmina]

Deuterium, 2 1H as you can see has an Mr of 2

2g of Hydrgen = 2/1 = 2moles
Using the equation pv=nRT

A = 2g = 2/2 = 1 mole at same V so different values so not correct

B = 4g/2 = 2mol but 2V so not correct

C = 1/1 = 1 mol oh H and 2/2 = 1 mol of Deuterium
Total mol = 2mol and same V = correct

D = 2/1 = 2mol of H and 1/2 = 0.5mol of Deuterium so not correct

Thanks alot

 

[shazmina]

Kp = p(H2)*p(I2)/p(HI)^2

If x mol of HI dissociates then you get x/2 mol of I2 and x/2 of H2. Also the amount of HI left is (b-x) mol.

Substitue the values.

Kp = p(x/2)p(x/2)/p(b-x)^2

Simplify it :

Kp = px^2 / 4(b-x)^2

Oh wooow Fantastic (Y) MAsha Allah
Thanks alot

 

[The Sarcastic Retard]

Oh wooow Fantastic (Y) MAsha Allah
Thanks alot

I had some misunderstanding but I got it... so directly copy pasted the solution..
No probs.. ^^

 

[nehaoscar]

Why would B - reducing the concentration increase the yield?

 

[nehaoscar]

??