OCR Chemistry F321 Exam. - [Next Tuesday[

http://www.thestudentroom.co.uk/misc...ents&t=1943168

There you go bro

oh dear, we're meant to know that too?

yes sadly
i got a good question pride what is the bond angle of SO3 ?not sure my self and how many lone pair annd bondig pair does it have
is it a trigonal planar?

SO3.

It's got 3 double bonds around the S so trigonal planar. It's strange because technically it has 12 electrons around it instead of 8, expands the octet.

How comes I don't 'have enough privileges' to download a past paper/ms? It works find for when the attachment shows within the thread, but not when using a link like the above.

Actually it says "lucid3, you do not have permission to access this page."

Also, the link didn't work because you copied and pasted the link with the .....'s. However I tried the full link on page 3 and no luck

Anyone resitting?

I am resitting

Oh, how did you find the January one?

Someone sent me the link. However the link as now been disabled as I think it breached site regualtions

Did you not sit it?

And the history of the periodic table wont come.
It hasnt been on any past papers.

I sat jan 2011 and got one mark off an A

I am hoping for near 100 percent this time as I need an A in chemistry for university.

Aw that sucks, I hate when that happens.
Oh well, good luck.

Cheers and to you to.

Is this the first time you are sitting it

Whats your weakest area?

Nope, I sat it in January, I was like 3 marks off an A.
But the January one was really hard, I dont even know how I got that.

I get really confused by the types of bonding in molecules questions.
But I like the calculation parts.

Types of Bonding

Metallic - Between metals. Large positive lattice with negative delocalised electrons. The greater the charge on the metal ion, the larger the bond. Can conduct electricity
Ionic - Between non metals and metals. Ionic bond defined as electrostatic oppositely attracted ions. High melting and boiling points. Can only conduct electricity in solution.
Giant Covalent - Atoms like carbon and sulfur. Hight melting and boiling points and cannot conduct electricity
Simple Covalent - Cl2 Br2 etc. Only weak van der waal forces between molecules. Boiling points increase the more electrons are surrounding the atom. For example I2 has higher boiling point than Cl2