Ethanol Multi Choice (CSSA Exam) (1 Viewer)

[howareya]

what did people have as an answer

i put down D was that right

 

[underthesun]

forgot, but i counted the amount of moles and multiplied by 1360 kJ

The amount of moles was zero point something

 

[howareya]

i divided by the moles is that right?

 

[Rand]

The answer was 340 kJ i think

its: (11.5/46.06) x 1360 = 339.56
~ 340 kJ

That was an easy question guys, dont worry bout it!

How about that question regarding microscopic membrane filters.
I put (D), ie. large surface area.
I think I remember reading somewhare that using MMFs can eliminate the need to use chemical treating.

Well, 4U maths on Monday

 

[howareya]

why did you times not divide

 

[Rand]

Well, one mole of ethanol produces 1360 kj of energy, ok?

But less than one mole was used, right i.e. 11.5 moles is approx 0.25 moles.

Therefore, a QUARTER of the energy produced by one mole is given off, i.e. 1360/4 = 340 kJ

Simple, right?!

 

[Ragerunner]

there are 2 answers to the membrane question

because membranes are ALSO used after everything has been chemically treated. so the answer is B as well as D

even our teacher told us before the exam that there were 2 answers

 

[iambored]

u ppl freak me out coz i dnt have a clue wat i put

 

[Ragerunner]

im pretty confident im gonna get 15/15 for my multiple choice

 

[underthesun]

you lucky you

 

[Rand]

yay

That means probably 14 or 15 outta 15

 

[Ragerunner]

i hope i get 95+/100
then that would be a big change from my year 11 yearly of 19/100

 

[Chand]

woah....*crosses finger*...i hope i do well than my half yearlys...good luck all