Thoughts? (3 Viewers)

[karnage]

I reckon that's probably one of the easiest Chem papers in many years...

Yea prolly, but i didnt kill it rofl. 1 day revision we'll see how i go.

 

[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!

>=[

 

[gcchick]

Friggin awesome exam. The calculations were a bit iffy, and the Industrial Chemistry option was a bit of a bitch. But overall, pretty good. Sayoonara Board of Studies!

 

[danz90]

All the calculations I found quiet hard. I guess I didn't practice them recently for a long time, lol. Found so much mistakes in the calculations.

For the AAS for zinc, I was like wtf.

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 ?

 

[Yamiyo]

The average mass of zinc in tablets - 0.16mg -- I agree

Titration question, [HCl] = 1.057 mol/L -- Got something like 0.9M

The identitfy of gas = H₂(g) -- I agree

Highest energy released by: Hydrogen gas fuel -- I agree

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

Litres of Hydrogen Gas required: something like 269,xxx L ? -- No idea

Voltage of galvanic cell -- 1.60V

 

[karnage]

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]

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]

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]

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]

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]

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]

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]

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]

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]

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]

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


The previous one has two oxidations, which is impossible

This.