Take our quiz to find out what your revision personality is! >>

Higher Chemistry 2010 Answers Thread -

Scroll to see replies

Orbit3

I'm pretty sure 39 was D. cant remember what the question was, but you ended up with sodium hydride. since it asked which reaction hydrogen was the oxidising agent in, the hydrogen itself is reduced. this is a gain in electrons. since in all the other ionic substances in the table the hydrogen formed H+ ions, it cant have been them. sodium ALWAYS forms positive ions, meaning that on this rare occasion, the H ion was negative, meaning it has gained an electron.

kingh-singh

39) D (teacher's answer)

Oh sorry! I actually put D as my final answer in the exam itself, but I thought the answer I'd put (D) was wrong for some reason. I'm relieved anyway! Better that I put the right answer in the exam and the wrong answer on TSR than the other way around. I'll change it now. :s-smilie:

Kelz_26

You have 26 as A but then in the solution as D?

SofianeKouadria

Is 26 not D?

Sorry, that's a typo. 26 is D. I'll change that now.

Reply 381

Kelz_26

Did anyone get 8 hydrogen atoms are present in the diamine molecule?

Reply 382

Dj-Dark-1

Kelz_26

Did anyone get 8 hydrogen atoms are present in the diamine molecule?

Was it not 6? 3 from the phenyl group and 3 from the other branches?

Reply 383

Kelz_26

Dj-Dark-1

Was it not 6? 3 from the phenyl group and 3 from the other branches?

Oh...

That was one of the ones i thought i had right!

Reply 384

Kelz_26

Dj-Dark-1

Was it not 6? 3 from the phenyl group and 3 from the other branches?

But there's five on the other branches?

Hmm.. I got 8.

Kelz_26

Did anyone get 8 hydrogen atoms are present in the diamine molecule?

Im pretty sure i put 8? But everyone else i asked seemed to put 6.

Reply 387

Dj-Dark-1

Kelz_26

But there's five on the other branches?

I would need to see the question again but 6 was the answer I remember writing. I mean, I could be wrong.

Reply 388

CHS4

I also got 8
for the question after that where it asked u to draw one molecule did u draw a molecule with a peptide link

Reply 389

Viva_92

Arghh comparing my answers I have got 20/40 for MC :frown:

The thing I hate about chemistry is that you think your right and then you find out that its wrong! So many things to trick you!

Theres no way I'm getting a B for uni :frown:

Reply 390

Viva_92

calm_storms

Im pretty sure i put 8? But everyone else i asked seemed to put 6.

Yep 8

Reply 391

AyuuBB

Did you make sure you counted the hydrogen atoms on the RIGHT side? And not the left one? Because the left molecule was a diacid if I remember right.

Reply 392

innerhollow

RizzyI

I got 8 for that one.
For the first question on section b you remember what you put?

Yeah it's 8.

The answer for the first question is:
Lithium- metallic, lattice
Boron- covalent, network
Nitrogen- covalent, discrete molecules

Kelz_26

Did anyone get 8 hydrogen atoms are present in the diamine molecule?

Dj-Dark-1

Was it not 6? 3 from the phenyl group and 3 from the other branches?

calm_storms

Im pretty sure i put 8? But everyone else i asked seemed to put 6.

AyuuBB

Hmm.. I got 8.

DEFINITELY eight!! Here's a picture of it. I remember spending a while on this one (I spent too long on the earlier questions, and ran out! Awful time management!)

diamine.bmp462.3KB

Reply 393

RizzyI

I got 8 for that one.
For the first question on section b you remember what you put?

Reply 394

afshooneh

did anyone else get 12 for one of the questiones? cant remember which one

Reply 395

Kelz_26

Dj-Dark-1

I would need to see the question again but 6 was the answer I remember writing. I mean, I could be wrong.

There's six on the left diagram (the diacid). Maybe you counted that one by mistake?

Reply 396

afshooneh

Kelz_26

Did anyone get 8 hydrogen atoms are present in the diamine molecule?

YES 8

Reply 397

AbigailTM

see if you put covalent molecular for Nitrogen instead of discrete molecules is that alright?

Reply 398

OneTreeHill

AbigailTM

see if you put covalent molecular for Nitrogen instead of discrete molecules is that alright?

i put covalent molecular. is it not covalent molecular??

Reply 399

Kelz_26

Did anyone else draw a graph similar to this on how the rate varied with increasing temperature? (PPA question)
http://www.customheatersandresearch.com/gallerylarge/cj9b/Temperature_Graph.jpg
Not a very good graph but you get the idea, rising and then levelling off like that. Maybe it was just a straight line though?

And this is random and probably a stupid question, but how do you quote more than one person on one message?!