OCR B (Salters) F332 Tuesday 4th June 2013 Exam Discussion (Now Closed)

This is really good, I made some notes from mark schemes a while back which I can add to this

How do modern catalysts work?
-Absorb* the molecule
-Break it's bonds
-Make new bonds
-Release it

What is the main intermolecular bond that arises between polyethene chains and how does it occur?
-Instantaneous dipole-induced dipole
-At a certain moment in time the electrons may be closer to one side of the molecule creating an instantaneous dipole
-This can induce a dipole in an unchanged molecule then repel it

How can compounds exist as a pair of E/Z isomers?
-It has a double bond to prevent it from rotating
-It has two different groups on each of the C=C (note: you will lose the mark if you say 'functional groups')

What is meant by 'heating under reflux'?
-Boiling a liquid in a closed system
-So that no product is lost

Why does formation of ozone not take place in the troposphere?
-High frequency radiation is only present in the stratosphere
-O radicals are formed by the photodissociation of O2


I'll edit this and add some more later

*Adsorb

Ok so someone messaged me or something- it was a notification and I don't know how to view it again but I think they were asking about the recurring questions thing I said I was going to do. I have been really busy so I haven't really done much but here is what I have so far. It's really messy atm but if you guys have any ideas on how to make the info more readable in terms of highlighting or layout please do voice your suggestions. Thanks

Im not sure about this question..
explain how the presence of hydrogen bonds between chains produces a polymer that is not very flexible.
any help please?

Hydrogen bonding is the strongest type of intermolecular bond so it holds the polymer chains much closer together, therefore the chains cannot move as much so are less flexible.

This is really good, I made some notes from mark schemes a while back which I can add to this

How do modern catalysts work?
-Adsorb the molecule (you will lose the mark if you write absorb)
-Break it's bonds
-Make new bonds
-Release it

What is the main intermolecular bond that arises between polyethene chains and how does it occur?
-Instantaneous dipole-induced dipole
-At a certain moment in time the electrons may be closer to one side of the molecule creating an instantaneous dipole
-This can induce a dipole in an unchanged molecule then repel it

How can compounds exist as a pair of E/Z isomers?
-It has a double bond to prevent it from rotating
-It has two different groups on each of the C=C (note: you will lose the mark if you say 'functional groups')

What is meant by 'heating under reflux'?
-Boiling a liquid in a closed system
-So that no product is lost

Why does formation of ozone not take place in the troposphere?
-High frequency radiation is only present in the stratosphere
-O radicals are formed by the photodissociation of O2


I'll edit this and add some more later

Is it okay if I add this to to the document ? and thanks for these btw

...and here's the rest of it

cant you post your markscheme notes for f332

Here's the mark scheme for January 2013 for anyone that was asking for it

Omg this is gonna be my mock exam next week but not gonna look at the markscheme tempting as it maybe lol

What mark scheme notes, sorry?


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I quote:




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I need to smash this exam to make up for my coursework... Does anyone else feel that Salters Coursework must have spawned from the very depths of hell?

If you count up the carbons and hydrogens on the cyclopentene, you can clearly tell they both don't share the same general formula, since for cyclopentene its C5H8 [a general formula of CnH(2n - 2) for a cycloalkene containing one double bond], whereas a "normal" pentene with just one double bond at the end is C5H10 [or a general formula of CnH2n]

Also, sorry, I should've quoted the user who originally asked this question, oops!

Are you re-sitting? If so then you have plenty of opportunity to smash the exams and pull your grade up. 56 is awesome, well done