Unit 3 Questions MEGATHREAD :)

[mickeymouse]

thushan what do you mean by line drawings? haven't heard of that term do you mean structural formulas that don't show all bonds?

[jane1234]

Does VCAA like you to write H2CO3 or separate it into H2O and CO2 (for chemical equations - e.g. Na2CO3 + H2SO4)?
Or are both acceptable?

[thushan]

Line drawing - something like this:

http://www.csupomona.edu/~lsstarkey/linedraw/line_images/hex_line.gif

[thushan]

Does VCAA like you to write H2CO3 or separate it into H2O and CO2 (for chemical equations - e.g. Na2CO3 + H2SO4)?
Or are both acceptable?

For an acid-base reaction don't write H2CO3 as a product. It is true that H2CO3 is formed, but it immediately decomposes (H2CO3 is unstable) to form CO2 + H2O. So write CO2 + H2O.

[Dr.Lecter]

Line drawing - something like this:

http://www.csupomona.edu/~lsstarkey/linedraw/line_images/hex_line.gif

This particularly pertains to drawing the benzene ring.

[jorrrdan]

hey, does anyone know whether or not you need to include states for reaction pathway equations, in particular for the catalysts. is it acceptable for vcaa if you just write the catalyst above the arrow?

[DisaFear]

Which of the following amino acids will have the highest pH when dissolved in solution?
Aspartic acid, histidine, lysine or methionine

What are we meant to look for to determine the answer?

[Water]

This was asked before, in a previous post, but their Z group.

[Tashi]

Does VCAA like you to write H2CO3 or separate it into H2O and CO2 (for chemical equations - e.g. Na2CO3 + H2SO4)?
Or are both acceptable?

For an acid-base reaction don't write H2CO3 as a product. It is true that H2CO3 is formed, but it immediately decomposes (H2CO3 is unstable) to form CO2 + H2O. So write CO2 + H2O.

Argh I was just reading through this thread and then realised I recognised your name from someone's facebook status I'd just read in my news feed ahahaha :p

[Andiio]

Is it better to write glycosidic linkage or an ether bond when identifying the func group linking 2 glucose molecules together?

[generalkorn12]

I think they're both pretty much the same, I prefer to use Ether though (easier to spell )

[Tashi]

Is it better to write glycosidic linkage or an ether bond when identifying the func group linking 2 glucose molecules together?

Is it an ether bond or ether functional group?

[thushan]

ether functional group or ether linkage

[thushan]

Do we need to know about every part of all the instruments of AAS, UV-vis, IR and NMR? Like the monochromators, the coil, the magnet, hollow cathode lamp and all?

[Andiio]

Similarly is it better to refer to the production of an ester as esterification or condensation?

And is it worth the 'risk' to specify condensation elimination/polymerisation rather than simply condensation?

EDIT: Also, just for clarification, on an amino acid, is the -NH2 group referred to as an amine group or amino? (or both?)