Grammar 2020 help thanks (2 Viewers)

[SadCeliac]

Wait wdym how to determine ethyl ethanoate vs methyl methane are

if you do all the work you basically get that it's a four carbon ester, and idk how to determine what type of ester it was

crib says you can figure it out w h nmr and mass spec but idrk

 

[synthesisFR]

Wait I’ll just summarise how I solved it

 

[SadCeliac]

Wait I’ll just summarise how I solved it

send a pic of working??

 

[synthesisFR]

send a pic of working??

Yep lemme find it

 

[synthesisFR]

basically
Hydrogen environment
One has an area of 3, and a singlet so its next to the COOR group as a terminal carbon right
so its CH2COOR
Then the other two carbons r just next to each other hence the quartet (3 neighbours so another terminal carbon) and triplet (2 neighbours come from carbon in next to terminal)

 

[synthesisFR]

are you giving urself a full 3 hours for each paper?

 

[SadCeliac]

basically
Hydrogen environment
One has an area of 3, and a singlet so its next to the COOR group as a terminal carbon right
so its CH2COOR
Then the other two carbons r just next to each other hence the quartet (3 neighbours so another terminal carbon) and triplet (2 neighbours come from carbon in next to terminal)

Ok yep got it

 

[synthesisFR]

do u have any reccomendations for hard papers i havent done yet?

 

[SadCeliac]

do u have any reccomendations for hard papers i havent done yet?

broski

what have I done that you haven't for chem lol

maybe sbhs 2019? doesnt look like its on your list

 

[SadCeliac]

bruh that's so many, I never did this many papers, I did only 3-4 max for maths and like 1-2 max for the rest

nah are you for real

and what atar did you get

this is crucial stuff

how tf did you not spend your whole life on this

 

[synthesisFR]

bruh that's so many, I never did this many papers, I did only 3-4 max for maths and like 1-2 max for the rest

only?

 

[mmmmmmmmaaaaaaa]

yea I'm not kidding lol

I got ~97 (not telling my exact ATAR so a particular someone doesn't dox me)



I guess it's because I did more humanities subjects so memorising/knowing stuff was sufficient

jeeezzz what an academic weapon you are

how you only do 1-2 for humanities!

 

[its_ace21]

jeeezzz what an academic weapon you are

how you only do 1-2 for humanities!

im gonna do 0 for business and legal idc

 

[Luukas.2]

but that's literally free marks wtf


soap has polar head / non polar tail
hydrophobic tail dissolves in non polar grease
friction from rubbing action lifts up grease molecule from surface and allows for more tails to dissolve
once tails have fully surrounded --> micelle
emulsion of soap water and grease micelles is rinsed away with water

bam clean

Re saponification, entropy is also contributing to the grease breaking away from the surface and into micelles / emulsifying in water.

 

[SadCeliac]

Re saponification, entropy is also contributing to the grease breaking away from the surface and into micelles / emulsifying in water.

How? I've never heard of that before

 

[Luukas.2]

Many small droplets of oil / grease, enclosed as micelles and moving through an aqueous phase is more disordered than one big chunk of oil / grease stuck to a surface. Just like an ionic solid dissolving, the process may be enthalpically favourable or disfavourable, but it is entropically favoured which is an important factor in the process being spontaneous.

 

[SadCeliac]

Many small droplets of oil / grease, enclosed as micelles and moving through an aqueous phase is more disordered than one big chunk of oil / grease stuck to a surface. Just like an ionic solid dissolving, the process may be enthalpically favourable or disfavourable, but it is entropically favoured which is an important factor in the process being spontaneous.

fair enough I guess