kyzoo's Chem questions

[kyzoo]

I need Chem help =D Lots and lots of gaps in my knowledge =X

From STAV 2008

1. What does atomization mean? How is C(s) --> C(g) the atomization of C?

2. How does ammonium salt generate H+ ions?

[vexx]

I need Chem help =D Lots and lots of gaps in my knowledge =X

From STAV 2008

1. What does atomization mean? How is C(s) --> C(g) the atomization of C?

2. How does ammonium salt generate H+ ions?

1. atomisation is pretty much just separating atoms, so making a solid clumped together pile of atoms as C(s) into the free moving more spaced gas particles.

2. Ammonium ion in the salt NH4+ reacts to form NH3 and H+

[toshibaj]

2. Ammonium ion in the salt NH4+ reacts to form NH3 and H+

Is the chemical reaction you are referring to:
NH₄⁺ + OH^- <--> NH₃ + H₂O ?

Nah I think its NH₄⁺ + H₂O <--> NH₃ + H₃O⁺

[vexx]

Sorry didn't see this,

I was referring to any reaction in general where NH4+ can act as an acid to donate an H+ ion.
So yes, that reaction is correct with NH4+ + OH-

[kyzoo]

ok another qusetion

VCAA 2008, the qusetion where it asks why the mass of methanol produced by the fuel clel is less than expected

Can I say "Assumption of previous part incorrect: Not all the current passing through the fuel cell is used to produce methanol" It wasn't oneo f the answers in the assessor's report, and I can't see anything ruling this answer out

[JinXi]

That Atomization Question. Reminds me too much about Vectors. 

[Martoman]

must be a physics joke >.<

[stonecold]

ok another qusetion

VCAA 2008, the qusetion where it asks why the mass of methanol produced by the fuel clel is less than expected

Can I say "Assumption of previous part incorrect: Not all the current passing through the fuel cell is used to produce methanol" It wasn't oneo f the answers in the assessor's report, and I can't see anything ruling this answer out

I dunno.  Borderline.  If some of the current wasn't used to produce methanol then you are implying one of two things:
-Current lost to heat (my stupid answer )  which is wrong
-Current caused other reactions to occur, which they define as 'side reactions' which would be right.

Probably lose the mark for not being clear enough, but I dunno, it really depends on the examiner with these answers that aren't printed in the report.

Anyone find this paper really easy?  I pray Thursday is like this...

[kyzoo]

=/ Y is curent lost by haet wrong?

And this paper was really long =/

[stonecold]

=/ Y is curent lost by haet wrong?

And this paper was really long =/

It said it in the paragraph underneath.  Doesn't apply to the context of this fuel cell or something.

And maybe it was sorta long, but very doable.  I don't mind if it goes ages as long as nothing stumps me haha...

[kyzoo]

=/ Y is curent lost by haet wrong?

And this paper was really long =/

It said it in the paragraph underneath.  Doesn't apply to the context of this fuel cell or something.

And maybe it was sorta long, but very doable.  I don't mind if it goes ages as long as nothing stumps me haha...

I saw that too but i don't understand y it doesn't apply to the contxt of this fuel cell

[HERculina]

i need help for chem too:

*How do you know if the product from a chemical reaction is a salt from looking at the equation
*How do you determine if a precipitate is formed when two aqueous solutions are reacted together
*I dont get the concept that the more reactive metal will replace a less reactive metal ion in a solution
*2KCL + Ag2SO4 ---->  K2SO4 +2AGCL , if the precipitate in this reaction was filtered what would the compound of teh residue caught in filter paper? and what would be in the filtrate?  


ill karma you

[stonecold]

=/ Y is curent lost by haet wrong?

And this paper was really long =/

It said it in the paragraph underneath.  Doesn't apply to the context of this fuel cell or something.

And maybe it was sorta long, but very doable.  I don't mind if it goes ages as long as nothing stumps me haha...

I saw that too but i don't understand y it doesn't apply to the contxt of this fuel cell

Don't quote me on this, but I thought that fuel cells just go chemical > electrical energy, so they shouldn't produce heat.

[kyzoo]

=/ Y is curent lost by haet wrong?

And this paper was really long =/

It said it in the paragraph underneath.  Doesn't apply to the context of this fuel cell or something.

And maybe it was sorta long, but very doable.  I don't mind if it goes ages as long as nothing stumps me haha...

I saw that too but i don't understand y it doesn't apply to the contxt of this fuel cell

Don't quote me on this, but I thought that fuel cells just go chemical > electrical energy, so they shouldn't produce heat.

=/ but its only 60-75%ish conversion arte from chemical to electrical, so there has to be waste heat

[stonecold]

=/ Y is curent lost by haet wrong?

And this paper was really long =/

It said it in the paragraph underneath.  Doesn't apply to the context of this fuel cell or something.

And maybe it was sorta long, but very doable.  I don't mind if it goes ages as long as nothing stumps me haha...

I saw that too but i don't understand y it doesn't apply to the contxt of this fuel cell

Don't quote me on this, but I thought that fuel cells just go chemical > electrical energy, so they shouldn't produce heat.

=/ but its only 60-75%ish conversion arte from chemical to electrical, so there has to be waste heat

Yeah, but they are saying the ~30% loss is not due to heat, but because methanol reacted in a different reaction or evaporated.

We need Mao to clarify haha...