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October 12, 2025, 08:31:26 am
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Author Topic: Howd you go on the chem exam?  (Read 75803 times)  Share 

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Studyinghard

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Re: Howd you go on the chem exam?
« Reply #270 on: November 11, 2010, 01:43:20 pm »
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i remember the mole numbers were like 2 16 7 6
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meefz

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Re: Howd you go on the chem exam?
« Reply #271 on: November 11, 2010, 01:44:04 pm »
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wait, wasnt the mole for oxygen 15?
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mustafa

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Re: Howd you go on the chem exam?
« Reply #272 on: November 11, 2010, 01:44:30 pm »
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Christ, someone with brains pls
explain how on earth is it possible to have electrons flow to the anode????
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happycat

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Re: Howd you go on the chem exam?
« Reply #273 on: November 11, 2010, 01:44:34 pm »
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Quote from: Studyinghard on November 11, 2010, 01:02:44 pm
nice and mass of lithium was 80.3 grams?
I had that but I went by number of sig figs and said 80 grams since Li in data sheet was 6.9, 2 two sig figs which was the least number of them
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darkphoenix

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Re: Howd you go on the chem exam?
« Reply #274 on: November 11, 2010, 01:44:41 pm »
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Quote from: meefz on November 11, 2010, 01:42:18 pm
What did people get for the balanced complete combustion of benzoic acid???

Fkn balancing too ages!! LOL

Hm i think overall it wasn't too bad, considering i barely studied for it (2 prac exams) and had around 6.5 hrs of sleep. I agree that some questions were weird though.
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jasoN-

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Re: Howd you go on the chem exam?
« Reply #275 on: November 11, 2010, 01:44:54 pm »
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2C6H5COOH + 13O2 -> 12CO2 + 6H2O delta(H) = -6454
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vexx

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Re: Howd you go on the chem exam?
« Reply #276 on: November 11, 2010, 01:44:58 pm »
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Quote from: meefz on November 11, 2010, 01:44:04 pm
wait, wasnt the mole for oxygen 15?

yeah i got 15 too, since the right side had 34 Oxygens, where 4 were taken out by benzoic itself.
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mustafa

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Re: Howd you go on the chem exam?
« Reply #277 on: November 11, 2010, 01:45:32 pm »
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Oxygens mole number is definitely 15
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andy456

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Re: Howd you go on the chem exam?
« Reply #278 on: November 11, 2010, 01:45:39 pm »
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Quote from: mustafa on November 11, 2010, 01:44:30 pm
Christ, someone with brains pls
explain how on earth is it possible to have electrons flow to the anode????
In Mao's topic he explained why he believed it was C... go and have a read of it and move on..........
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vexx

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Re: Howd you go on the chem exam?
« Reply #279 on: November 11, 2010, 01:46:39 pm »
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Quote from: jasoN- on November 11, 2010, 01:44:54 pm
2C6H5COOH + 13O2 -> 12CO2 + 6H2O delta(H) = -6454

you missed a C, there are 7 carbons in benzoic acid, hence 14 are needed on the other side after doubling it
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jasoN-

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Re: Howd you go on the chem exam?
« Reply #280 on: November 11, 2010, 01:47:15 pm »
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OH FUCK MY LFE!

wait my delta H is still right yes?
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meefz

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Re: Howd you go on the chem exam?
« Reply #281 on: November 11, 2010, 01:47:41 pm »
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i got 25KJ/C for my calibration factor.
Was i meant to use the 3227 or the 6454 in my calculations, cause i used 6454.
i think im wrong. :(
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vexx

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Re: Howd you go on the chem exam?
« Reply #282 on: November 11, 2010, 01:47:55 pm »
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Quote from: jasoN- on November 11, 2010, 01:47:15 pm
OH FUCK MY LFE!

you'll get 2/3 if you did correct states.
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stonecold

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Re: Howd you go on the chem exam?
« Reply #283 on: November 11, 2010, 01:48:37 pm »
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Quote from: andy456 on November 11, 2010, 01:45:39 pm
Quote from: mustafa on November 11, 2010, 01:44:30 pm
Christ, someone with brains pls
explain how on earth is it possible to have electrons flow to the anode????
In Mao's topic he explained why he believed it was C... go and have a read of it and move on..........

because they have to go through the circuit, and can't go through the solution.

thought it was rather simple.

this q will save my ass for my dumb mistake on Q7...  :D
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andy456

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Re: Howd you go on the chem exam?
« Reply #284 on: November 11, 2010, 01:49:24 pm »
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ok for the benxoic question i forgot to double the the delta H...
in the calculations i used the undoubled number... is that wrong??
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