Thoughts?

[karnage]

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Originally Posted by danz90

These are some calculation answers that I got, that I can remember. Can someone compare/clarfiy?

The average mass of zinc in tablets - 0.16mg

Titration question, [HCl] = 1.057 mol/L

The identitfy of gas = H₂(g)

Highest energy released by: Hydrogen gas fuel

Amount of energy released by 80L petrol = 2.6 x 10⁶ kJ , or something like 2,640,000 kJ.

Litres of Hydrogen Gas required: something like 269,xxx L ?

Uh yea i think recall i got somethin like that. whatta fluke

[r0kstar]

Originally Posted by JamesTockuss

The cathode was the chlorine gas turning into chlorine anions.

r u sure?
coz thats wat i did
except a teacher sed it was water? :S

[Shadose]

Originally Posted by danz90

These are some calculation answers that I got, that I can remember. Can someone compare/clarfiy?

The average mass of zinc in tablets - 0.16mg

Titration question, [HCl] = 1.057 mol/L

The identitfy of gas = H₂(g)

Highest energy released by: Hydrogen gas fuel

Amount of energy released by 80L petrol = 2.6 x 10⁶ kJ , or something like 2,640,000 kJ.

Litres of Hydrogen Gas required: something like 269,xxx L ?

That looks like a source of relief. I confirm the zinc ironically, because thats what I got ... but I wrote it in small letters or crossed it out. The gases are right, they are hydrogen, I don't remember the other values, but they look like mine.

[danz90]

Originally Posted by Yamiyo

Voltage of galvanic cell -- 1.60V

Awesome, got this too

And the equation was :

Ni(s) + 2Cl^-(aq) ----> Ni²⁺(aq) + Cl₂(g)

?

[danz90]

For people doing industrial, did you determine that the system was NOT at equilibrium?

[r0kstar]

Originally Posted by cookiemonsterz

ooh that was the only question i wasn't sure about. I used the Cl2 gas porential, times it buy 2 and added it to the +ve nickel one. That meant i got a voltage of about 2.9X volts, dont quite remember. What did evry 1 else get?

i puttttt
Ni + Cl2(g) --> 2Cl- + Ni2+

which is the wrong way round now that i look at it....
i got voltage of 2.96V too

[benji6667]

The average mass of zinc in tablets - 0.16mg - Agree With

Titration question, [HCl] = 1.057 mol/L - I got like 0.02

The identitfy of gas = H2(g) -yep

Highest energy released by: Hydrogen gas fuel -yep yep

Amount of energy released by 80L petrol = 2.6 x 106 kJ , or something like 2,640,000 kJ. I'm pretty sure i got something around this number

Litres of Hydrogen Gas required: something like 269,xxx L ? -think i got this

[old.skool.kid]

Originally Posted by UncoKane

It was so much harder than I was expecting!

I'd never seen so many calculation questions in my life!

I was so cut that there were no batteries or esterification questions!

>=[

Werent you supposed to include esterifacation in the ethanol q?

[fishbulb]

Originally Posted by danz90

Awesome, got this too

And the equation was :

Ni(s) + 2Cl^-(aq) ----> Ni²⁺(aq) + Cl₂(g)

?

Uh no.
Ni(s) + Cl₂(g) ----> Ni²⁺(aq) + 2Cl^-(aq)


The previous one has two oxidations, which is impossible

[benji6667]

yeah i did this... why are people writing the potentials for potassium?

[Shadose]

Originally Posted by r0kstar

r u sure?
coz thats wat i did
except a teacher sed it was water? :S

Yep.

Clorine ion is on the negative terminal, that is Anode, where it loses an electron to become a gas.

edit.
wait...that was for industrial option...sorry, it was for electrolysis ^^"

[r0kstar]

Originally Posted by squeenie

It was an alright paper. Not too easy, but not as hard as some of the past papers I've done.

Did anyone else get hydrogen gas for question 20?

yup is it right?

[karnage]

Originally Posted by danz90

For people doing industrial, did you determine that the system was NOT at equilibrium?

yea thats what i said : /

[OSMANAYD]

yeh i got the exact same results. What a relief.
What did everyone get for the 4th mc question? Was it water or nitrogen that is most abundant in the atmosphere at the ground state?

[independantz]

Originally Posted by fishbulb

Uh no.
Ni(s) + Cl₂(g) ----> Ni²⁺(aq) + 2Cl^-(aq)


The previous one has two oxidations, which is impossible

This.