Whos ready for the June 9th exam?

[m@tty]

AHHH!! I just did VCAA 08 and lost the most stupid mark  :tickedoff:  But for this one small error, I would have done awesome. And it was a simple calculator problem. *vent* Ahhh.. So close... Wow, just realised that 1 mark lost =  99% :p


EDIT:

And logarithm/exponential rules.

For logarithm, the result value must have the same number of decimal places as significant figures of the input value. For exponential, result value must have same number of significant figures as the decimal places on input value.

If it requires more than one calculation, I just keep all my figures on my calc and then put the sig figs to the smallest of the numerical values provided in the question. Is that it?

Unless you added or log'd or powered, that should be right.

[vexx]

personally id on't really see what's so hard about significant figures...

yeah this is what i thought- where i had never gotten them wrong before but after that exam apparently you have to use (l) in so many more reactions then just 'water' as we were told >__>
i think i've learned now so it's fine but it was just a shock haha.

Care to share? I am always unsure of what state is required...

what state is required?
it's pretty much just (l) for pure liquids such as all components of an esterification reaction, as two pure substances of an alcohol and carboxylic acid are needed, to form a pure esterification and water. all are (l), i just pretty much think about it like this, also with:
and (aq) is used for substances that have been dissolved and the ions formed/bonded, such as
Na(s) dissolved in water becomes Na+(aq) and then reacts with other compounds to form an aqueous NaCl(aq).
not the best explanation of mine but haha

[stonecold]

vexx, when doing organic reation for 4 or less carbon molecules, do you write gas or liquid.

i.e.  C2H4 (g) + H2O (g) ---> C2H6O (g)

or                      conc. H3PO4 (aq)

      C2H4 (l) + H2O (l) ---> C2H6O (l)

     

[kyzoo]

It's (g) for all reactants and products since you need a temperature of around 300C to carry out that reaction

[stonecold]

Thanks.  What about addition reactions with lightweight alkenes?

Because normally 4 carbons or less means it is volatile.  Does that still apply in such reactions?

[kyzoo]

Yea, especially since you don't carry out those reactions in "mild conditions"

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I have a question of my own lol.

VCAA 2006 - Q2b Extended Response

Would I lose a mark for saying "decrease the flow rate of water eluent" even though that wasn't one of the "acceptable answers" in the assessor's report?

Sorry I would post a picture if I was on my other computer >.<

[stonecold]

I remember doing this question too.  Wouldn't decreasing the pressure/flow rate make the separation worse?

[vexx]

Yea, especially since you don't carry out those reactions in "mild conditions"

--------------

I have a question of my own lol.

VCAA 2006 - Q2b Extended Response

Would I lose a mark for saying "decrease the flow rate of water eluent" even though that wasn't one of the "acceptable answers" in the assessor's report?

Sorry I would post a picture if I was on my other computer >.<

i just scanned this question, it says "further water was added periodically" and if you read it, this is just column chromatography, you can't decrease or increase the rate of water flow since there is no pump. i read this too quickly so apologies if i interpreted wrong.

[iffets12345]

In insight 2010, it said the ester formed was (l) O_O.... but I thought the H2SO4 swimming around made it (aq)

[kenhung123]

solutions hang between (aq) and (l) for those products formed in organic pathways...I hope vcaa accepts both states I mean it would be gay if its wrong for a state that isn't clearly obvious like (aq) and (s)

[kyzoo]

In insight 2010, it said the ester formed was (l) O_O.... but I thought the H2SO4 swimming around made it (aq)

Esters should be (l) because they are they are primarily non-polar and hence insoluble

[coletrain]

not really relevant but do we need photo ID, or do we just need to know our VCAA student number?

[iffets12345]

In insight 2010, it said the ester formed was (l) O_O.... but I thought the H2SO4 swimming around made it (aq)

Esters should be (l) because they are they are primarily non-polar and hence insoluble

Thanks, teacher verified today... sighs.

but fats are liquid?

and

not really relevant but do we need photo ID, or do we just need to know our VCAA student number?

Last year I just walked in with my student ID, but nobody really cared. I mean even the pencilcase/bound reference check was pathetic.

[darkphoenix]

not really relevant but do we need photo ID, or do we just need to know our VCAA student number?

For our school you need to know your VCAA number to know where to sit. But it will have yours on the exam paper anyway. Just gotta look for it.

Yeah last year for accounting i brought 2 calculators into the exam, they didnt seem to care.

[m@tty]

I finished last years exam 2 in 1 hr 20. One hours pretty fast !  

How'd you go ? I got 79% - so borderline A+ lol.. I thought I did wayy worse..

I just did it... Lost the most stupid two marks  :tickedoff: One for using 10^4 to convert from L to ml... And addressing only one part of the easiest two part question ever... But I did quite well on the rest Finished the questions in 1 hr 5 mins then checked for 20 mins..