Biology; Chemistry; Physics: Post your doubts here!

[multixamza01]

^ Not directly but the concept is required. And Concept means ... it should be learned.

 

[SalmanPakRocks]

let me check if it is in the syllabus or not!

 

[SalmanPakRocks]

hmmm what do u mean by mixing Acid and NAOH ??
I mean acid + Base will result in Salt + water i.e neutrilization.

Its got nothin to do wid the products....the question just asks how do we confirm the formula

H2O + H2SO4 = H2SO4 + H2O

 

[Anon]

^ Not directly but the concept is required. And Concept means ... it should be learned.

But it was never asked before

 

[GetSomeLife]

hmmm what do u mean by mixing Acid and NAOH ??
I mean acid + Base will result in Salt + water i.e neutrilization.

Its got nothin to do wid the products....the question just asks how do we confirm the formula

H2O + H2SO4 = H2SO4 + H2O

Not exactly...something changes
Otherwise y did my teaher gave the question fer 3 marks!!!

 

[SalmanPakRocks]

I can't find it in the syllabus.

 

[multixamza01]

People the Syllabus content only OUTLINES the syll. It's what the Candidates SHOULD know.

 

[SalmanPakRocks]

Not exactly...something changes
Otherwise y did my teaher gave the question fer 3 marks!!!

I don't know. But never encountered these kind of question in past paper.
Obviously when u add water to the any acid or base it dilutes it.

 

[SalmanPakRocks]

People the Syllabus content only OUTLINES the syll. It's what the Candidates SHOULD know.

can u plz point out that, where is it written in the syllabus?

 

[Anon]

Actually our teacher said it too it isnt in the syllabus, but we should prepare it.
like Alkaline and Acidic fuel cells...

when H2O is added to HCL, it forms H30 and CL,
something similar would be applicable here I believe.

 

[SalmanPakRocks]

but there is no CL here.....
And we can't change the formula or else it would have been H4SO5.

 

[Anon]

Can it be:

H2O + H2SO4 --> H4O + SO4 ?

 

[SalmanPakRocks]

I guess not because we are using adjusting the FORMULA which is totally unapplicable.
I m still doubtful about the cholrine one.

 

[GetSomeLife]

No way

H2O + H2SO4 gives SO2

 

[Anon]

MAybe:

H2O + H2SO4 --> H3O + HSO4

 

[SalmanPakRocks]

Still I think its wrong because we aren't making the correct Formula
anyways will someone like to help me out?

I need help in Thermal Physics (O levels)
Please Define
1)Heat Capacity:
2) Specific Heat Capacity:
3) Latent Heat of Fusion:
4) Specific Latent Heat of Fusion:
5) Latent Heat of Vaporisation:
6) Specific Latent Heat of Vaporisation:
Also if there is any formula for these then do let me know.

 

[Anon]

I guess not because we are using adjusting the FORMULA which is totally unapplicable.
I m still doubtful about the cholrine one.

Actually, the chlorine thing too is, "stretching the syllabus"...

It is correct.. our teacher was telling something like that before the Exam..I clearly remember..

 

[Anon]

I dont remember exact definition now...

formulas are:

Specific heat capacity:

Q = mc Δ Θ

c= specific heat capacity
m= mass
Δ Θ: change in temperature
Q= energy provided.

Heat capacity:

Q= cΔ Θ


Latent Heat of Fusion
Latent Heat of Vaporisation

l = latent heat of vapourisation/fusion

 

[SalmanPakRocks]

hmmm I'll then wait for someone with the Definations but Thanks for the Formulas.

 

[abcde]

I need help in Thermal Physics (O levels)
Please Define
1)Heat Capacity:
2) Specific Heat Capacity:
3) Latent Heat of Fusion:
4) Specific Latent Heat of Fusion:
5) Latent Heat of Vaporisation:
6) Specific Latent Heat of Vaporisation:
Also if there is any formula for these then do let me know.

^Where's your Physics book?