Unit 3 Questions MEGATHREAD :)

[luken93]

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?

Urgh, I hope not. They're too hard to define!

btw, on that topic, what are the "official" names of the lamps in AAS and UV-Vis.
Saying "Copper Lamp" sounds way too informal haha

[stonecold]

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?

esterification is the most specific term if you are producing an ester.  put condensation as well, it is not wrong.

similarly, as long as it actually is polymerisation, (i.e. grycerol + fatty acids is NOT polymerisation) then there is nothing wrong with that.

[luken93]

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?

They usually always accept either, however I wonder if you'd be penalised if you wrote both when they're both correct?
I could just imagine myself sitting there at 1hr 29mins continuously rewriting the name of a linkage hoping that I choose the write one...

Also, linkage or bond? Or is it case specific...

[thushan]

Write linkage, its safer.

[Dr.Lecter]

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?

basic knowledge of AAS and UV-vis - NMR is far too complex at this point in time

[Tashi]

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?

I reckon you'd have to know about the lamp and what it does. Also probably the monochromator but that's not too hard. I don't think you'd really have to know the fine details of NMR (like the radio transmitter coils or whatever), however I'm not sure.

[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?

esterification is the most specific term if you are producing an ester.  put condensation as well, it is not wrong.

similarly, as long as it actually is polymerisation, (i.e. grycerol + fatty acids is NOT polymerisation) then there is nothing wrong with that.

In the exam are we allowed to write answers like this: esterification/condensation reaction.

:\

[stonecold]

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?

esterification is the most specific term if you are producing an ester.  put condensation as well, it is not wrong.

similarly, as long as it actually is polymerisation, (i.e. grycerol + fatty acids is NOT polymerisation) then there is nothing wrong with that.

In the exam are we allowed to write answers like this: esterification/condensation reaction.

:\

As long as they are both right, I can't see why not.  I frequently do it because generally there is more than one term to describe what is going on.

[mickeymouse]

would we have to know how to draw the reactions of specific addition polymerisation reactions? e.g. PVC and polystyrene

[Tashi]

would we have to know how to draw the reactions of specific addition polymerisation reactions? e.g. PVC and polystyrene

I think they'd give you the structure of the monomer/polymer first if they expected you to draw the reaction.

[luken93]

stonecold's back!

[nacho]

Explain why it is necessary to remove water and other contaminants from the biodiesel.
my answer - Biodiesel is a fuel, and if it were to combust in the presence of a high concentration of water, the water would prevent the combustion from occurring.

Neap answer: The biodiesel must be of a high enough concentration to burn in the combustion process.

am i correct to some degree?

[DisaFear]

I'd say yes
I faced that question yesterday, didn't know the answer so I wrote "Water is not a fuel so may hinder performance" heh

[Water]

Not sure if I'm right?.

But its to remove all impurities of biodiesel to obtain its most concentrated form.


Was using it based on Ethanol, and its process of obtaining it ;x

[nacho]

whatd you guys get on neap 11?
i lost like 3 marks cause i put the wrong things in my calc lmao