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

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Reply 520

super121

Original post by Yunggee

Hi do you know what the bonding in NO2 is like, 2 teachers told me 2 different ways which sucks :/

NO2 is a radical, so double bonds with the Oxygens and an unpaired electron on the nitrogen :smile:

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Reply 521

abzy1234

Original post by michmic

How to identify addition and condensation polymerisation?

Addition polymerisation is when two or more smaller monomer units join together to form a larger molecule (polymer), without the loss of any small molecules.

Condensation polymerisation is when two or more smaller monomer units join together to form a larger molecule (polymer), with the loss of a smaller molecule (usually water or HCL).

This exam mainly focuses on addition polymerisation; I'll be very surprised if they mention condensation polymerisation as its not on the spec and focused more in F334. :smile:

Reply 522

Branny101

Original post by super121

I would say, it depends on what they give it to you as, but they usually just accept both (but be on the safe side) :tongue:

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Thankayouuuu :biggrin:

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Reply 523

King Hotpie

On the advance notice, does the arrow going from Nitrogen to oxygen for nitrous oxide mean the nitrogen is contributing the electrons to the dative bond? So the oxygen is effectively not using any of its own electrons to bond?

Reply 524

abzy1234

Original post by King Hotpie

You're correct, remember to show all the lone pairs as well :smile:

Reply 525

krisshP

Original post by super121

OH bonded to a benzene ring is called a phenol :smile:

Do we have to know how to name phenols?

Reply 526

krisshP

Original post by etadri

does anyone know what topics are more likely to show up tomorrow?

Topics in F332 :tongue:

Reply 527

krisshP

Original post by Yunggee

what does the bonding diagram look like for NO2?

http://www.thestudentroom.co.uk/showthread.php?t=2370946&p=42940383

Reply 528

krisshP

Original post by Yunggee

Hi do you know what the bonding in NO2 is like, 2 teachers told me 2 different ways which sucks :/

http://www.thestudentroom.co.uk/showthread.php?t=2370946&p=42940383

Reply 529

super121

Original post by krisshP

Do we have to know how to name phenols?

No, that's F334

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Reply 530

King Hotpie

Original post by abzy1234

You're correct, remember to show all the lone pairs as well :smile:

Thank you

I just thought it was weird that the central nitrogen has 3 bonds and a dative bond whilst the oxygen keeps all its electrons. Doesn't seem fair really :rolleyes:

Reply 531

tasnimc

What does the dot and cross diagram look like for a dative covalent bond?

Reply 532

wizardlad

can someone please give me links to any good revision places or any other good ways of revising? or could someone just send me links of revision notes would really appreciate it? :smile:

many thanks :smile:

Reply 533

abzy1234

Original post by King Hotpie

Thank you

I just thought it was weird that the central nitrogen has 3 bonds and a dative bond whilst the oxygen keeps all its electrons. Doesn't seem fair really :rolleyes:

Yah, dative structures can get a bit weird tbh. Oxygen's a boss :wink:

Reply 534

krisshP

Original post by wizardlad

can someone please give me links to any good revision places or any other good ways of revising? or could someone just send me links of revision notes would really appreciate it? :smile:

many thanks :smile:

http://www.chemguide.co.uk/index.html#top

Reply 535

krisshP