Suggested Answers - Illuminati

[kimk2kr]

I didnt actually specify that it would heat up just water.. I wrote that it heats up surrounding environment and that would affect that animals and plants :/

[charmanderp]

Yeah I agree, very dodgy. Considered both possible interpretations before answering and went with what seems like the unpopular choice...

I did the same as you because I also thought it was too obvious
Otherwise it was an unbelievably stupid question.

Though in hindsight perhaps calorimetry errors such as misreading of current, voltage and temperature change or insulation would have been the best option. I didn't even consider these, pigeonholed the question!

[Jordzs]

Blah at the tonnes question. I wrote 0.72 instead of 7.2 tonnes. Hope they award the mark because I did working out and all over it lol

[davo_10]

what do you reckon the A and A+ cut-offs will be?

[woliaj]

I wrote for the one asking about why the methanol delta H value was different:
The values in the data are found at 25 degrees and 1 atm, but perhaps the conditions in this bomb are different, should that be ok?

[DJing]

Yeah I agree, very dodgy. Considered both possible interpretations before answering and went with what seems like the unpopular choice...

I did the same as you because I also thought it was too obvious
Otherwise it was an unbelievably stupid question.

Though in hindsight perhaps calorimetry errors such as misreading of current, voltage and temperature change or insulation would have been the best option. I didn't even consider these, pigeonholed the question!

But doesn't the calibration factor make up for those kinds of errors/losses??? Eh, maybe I really just don't understand it, but I thought it had to be the 1mol vs 2mol thing since the calorimeter was calibrated...... 

[charmanderp]

Yeah I agree, very dodgy. Considered both possible interpretations before answering and went with what seems like the unpopular choice...

I did the same as you because I also thought it was too obvious
Otherwise it was an unbelievably stupid question.

Though in hindsight perhaps calorimetry errors such as misreading of current, voltage and temperature change or insulation would have been the best option. I didn't even consider these, pigeonholed the question!

But doesn't the calibration factor make up for those kinds of errors/losses??? Eh, maybe I really just don't understand it, but I thought it had to be the 1mol vs 2mol thing since the calorimeter was calibrated...... 

No the calibration factor only accounts between discrepancies between different experiments which use different calorimeters. Other errors/losses can't really be accounted for.

Thushan, do you think they'll give the 'wasn't completed at SLC' answer?

[illuminati]

I wrote for the one asking about why the methanol delta H value was different:
The values in the data are found at 25 degrees and 1 atm, but perhaps the conditions in this bomb are different, should that be ok?

Its got nothing to do with standard conditions unfortunately.

[woliaj]

Why not, what if the bomb is pressurised? Shouldn't that have something to do with something?

[Suzanne]

Can someone help out please...I dropped the H from the OH group on the malic acid...would that be wrong ?
HOOCCH2CH(OH)COO-   +   H20  ---->  HOOCCH2CH(O)COO2- +  H3O+   is what i put down.

[joseph95]

Yeah I agree, very dodgy. Considered both possible interpretations before answering and went with what seems like the unpopular choice...

I did the same as you because I also thought it was too obvious
Otherwise it was an unbelievably stupid question.

Though in hindsight perhaps calorimetry errors such as misreading of current, voltage and temperature change or insulation would have been the best option. I didn't even consider these, pigeonholed the question!

Oh sorry yeah I talked about insulation I think.

[DJing]

Wait so Illuminati, do you think the 2 mol/1mol ratio of combustion argument is ok? or not?

EDIT: This is for the deltaH question btw

[heart]

 its wrong  . Remember unit 3. H ion donates from the carboxyl group not the hydroxyl group.

[heart]

H(enthalpy)= U + pV
Hence saying pressure difference should be correct

[aww12]

Heyy, for 6cii, is it acceptable to say "to ensure a higher rate of reaction due to the constant inflow and outflow of reactants and products." Cause it needs high yield the first time around to mean more electricity/efficiency for the cell. Would be a waste if most of the reactants remained unreacted haha.