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Edexcel IAL, Unit 5: Transition Metals and Organic Nitrogen Chemistry. 22-Jun-2016

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Reply 240

PlayerBB

Original post by nimesh007

i got 1.83 n 1.98

Same!

Reply 241

PlayerBB

Thank God, it was easier than January 2016, I was so worried about that, however, I think it's one of those papers who has some tricky questions that you don't know you have fallen into!! The annoying part is that the grade boundaries gonna be high :frown:

And what was the answer for the diamond and graphite question, how I am going the remember that from O-level

Reply 242

Blazyy

Original post by PlayerBB

And what was the answer for the diamond and graphite question, how I am going the remember that from O-level

I wrote some nonsense about covalent bonds in diamond being stronger than the elctrostatic forces of attraction in graphite. I didn't what what to write for 3 freaking marks :angry:

Reply 243

Rahatara Sadique

Can anyone explain how the question to calculate masses of the Fe2+ and Fe3+ ions is done?

(edited 7 years ago)

Reply 244

skeletonboy1

i said graphite: one carbon bonded to three carbon atoms and it has a structure of layers stacking together by electrostatic force(not sure if it's electrostatic)
diamond: one carbon atom bonded to 4 carbon atoms and it's a giant lattice structure

Reply 245

Quiton

Both diamond and graphite have giant covalent structure ^^

I mentioned Van der Waal's forces between layers in graphite

(edited 7 years ago)

Reply 246

PlayerBB

Original post by Blazyy

I wrote some nonsense about covalent bonds in diamond being stronger than the elctrostatic forces of attraction in graphite. I didn't what what to write for 3 freaking marks :angry:

Same!!!! I totally forgot what their structures look like

I just wrote Diamond has a giant molecular structure while graphite has a simly molecular structure (I know it's wrong ugh)

And that the intermolecular forces between Diamond are much stronger than in between Graphite so higher energy is needed to overcome the bonds in Diamond than in Graphite

Reply 247

majidabdul

Do you think the grade boundaries would be set at 80 for A*

Reply 248

Rasudana

Hi guys! So what do you think about the grade boundaries of A*? 😕

Boundaries for A*

Original post by majidabdul

Do you think the grade boundaries would be set at 80 for A*

That's impossible! They weren't that high for unit 4 with similar difficulty

Posted from TSR Mobile

Reply 251

whisle

Original post by PlayerBB

That's impossible! They weren't that high for unit 4 with similar difficulty

Posted from TSR Mobile

It was 80 for Unit 4 IAL January.

However, I believe it will go up no more than 75 for A*.

Reply 252

whisle

Original post by Rasudana

Hi guys! So what do you think about the grade boundaries of A*? 😕

Don't worry you will get an A*.

The boundary for C34 was 115 but you managed to get A* so....

Reply 253

RizK

The question was about the strength of diamond and graphite, not the melting point :| so you can't really explain it using intermolecular attractions fully

Reply 254

Aimen.

Original post by majidabdul

What do u think will be threshold for A*

Something like 80

Reply 255

Aimen.

Original post by RizK

The question was about the strength of diamond and graphite, not the melting point :| so you can't really explain it using intermolecular attractions fully

So what did you write?
I wrote something like more london forces in diamond (idk why xD)
diamond- tetrahedral and graphite- trigonal planar
and 3 c-h bonds in graphite and 4 in diamond!
Is anything okay? :/

Reply 256

RizK

Original post by Aimen.

yes, the tetrahedral structure and the 4 bonds is correct
You should have mentioned the layers in graphite vs the rigid structure of diamond i think

Reply 257

Geethan

Original post by RizK

The question was about the strength of diamond and graphite, not the melting point :| so you can't really explain it using intermolecular attractions fully