Some questions to ask.... (1 Viewer)

[lala2]

For the HSC:

- How much Year 11 stuff will we need to know, and in what depth?
- Do I need to know about the standard hydrogen electrode (SHE)?--teacher never taught me but tutoring did????!!!
- Do we need to know the chemical composition of indicators?

Thanks

Happy revising

 

[Dreamerish*~]

• For the HSC, the entire preliminary course is assumed knowledge. Which is a different way of saying, yes, you need to know most things, if not everything. You need a good grasp on the concepts of chemistry, such as what isotopes, allotropes and isomers are, but you don't need to remember all the specifics, like the properties of fullerenes in comparison to graphite (althought it could help, in some rare cases). Basically, what you have learnt in year 11 become the tools in year 12. You're presented with new problems, but the tools you use to solve them are none other than your old problems that you conquered in the preliminary course - if I make sense at all. Don't sit back and let year 11 chemistry drip out of your brain - you'll need a lot of it.
• Yes, you need to know about the standard hydrogen electrode, but not until electrochemistry - you can worry about it when the time comes. And no, you don't need to memorise anything from that table - it's all given in the exam, as with the periodic table.
• It might be helpful to know that litmus is made from lichens, and the red cabbage indicator which you will make in class is made from, well, red cabbage. The universal indicator is a mixture of other indicators, but that's probably all you'll ever need.

 

[lala2]

Thank you. Also, with the production steps of polyethylene, is this good enough to know that:

HDPE--low temp and pressure, Ziegler-Natta catalysts are used?
LDPE--high temp and pressure, and the 3 steps of initiation, propagation and termination?

Or more detail or anything else I've missed out?

 

[rama_v]

Thank you. Also, with the production steps of polyethylene, is this good enough to know that:

HDPE--low temp and pressure, Ziegler-Natta catalysts are used?
LDPE--high temp and pressure, and the 3 steps of initiation, propagation and termination?

Or more detail or anything else I've missed out?

I would know the polymerisation process, like chain initiation and termination steps, the use of a peroxide etc.

 

[Dreamerish*~]

I would know the polymerisation process, like chain initiation and termination steps, the use of a peroxide etc.

I would also do the properties and uses.

 

[Haku]

know all three steps, initiation, propagation and termination.

initiation is done using peroxide to open double bond cause a radical to form on the end. This joins with unsaturated molecules and cause further radical on ends to form to keep the chain going. thats propagation. generally 1000 to 50000 molecuules in length.

termination occur when two molecules both with radicals join and a polymer chain forms.


and back to the original question, u dun need to know shit about the prelim course. like me i haven;t done the prelim course and still firing ok in the hsc (actually pretty good).