Higher Chemistry unit 2 NAB

I'm having a bit of trouble revising it, I've managed to master the PPAs, fuels, naming hydrocarbons, all the alcohol shiz but I just can't take the rest of it in lol :|

any tips? im the worst with functional groups

Just put sticky notes around your room with the functional groups drawn on.
same with the proteins, draw each type and stick it on your wall. Look at it and try and remember its name, and where it is found (i.e. hair etc).

That's basically all I did to remember the Unit 2 stuff. Sticky notes are your friend

Tip: make sure you know when O=C-N-H is an amide link, and when it's a peptide cause some people lost marks for that in my class.

And good luck

thanks! isn't the peptide link N(H2)? Polyamides

my teacher told us to revise C ratios, properties of kelvar and bipol...are there any mole/yield calculations in the nab? If there is I'll cry lol

Argh, I wrote a big paragraph then my internet went funny lol

Oh well...
no, NH2 is the amine functional group. A polyamide is when you have an amino acid joining an amino acid e.g.
~~~COOH H2N~~~COOH H2N~~~

releasing water and forming the amide/peptide link CONH

Yeah, C : H ratios come up, but it's a PS q. There's a % yield calculation but it's really easy Most people in my class over-thought it.

Erm..make sure you know the chemistry behind fuels as there's a few fuels questions. Don't give common sense answers, e.g. "What are the structural differences between leaded and unleaded petrol?" don' say "there's no lead" (as someone in my class did) yes, it's true; but they're looking for you to talk about the structure.

And also, know about resins etc

Good luck

thanks again, both of ya. ahaaa, the differences are something like branched/aromatic/cyclic molecules lol

There was a percentage yield question in both the practice and actual NAB I sat, so I think it's very likely to come up. However, it was very basic and I usually find them quite difficult but in the NAB I got it correct so I wouldn't worry about it. I think it was the last question in the NAB and was worth two marks if I remember correctly. Good Luck!

hah I was right, lost 3 marks lol, but passed

How did your prelim go?