OCR Chemistry A Exam Thread (Breadth - May 27 2016 and Depth - June 10 2016)

Reply 1340

Jitesh

14

Original post by 11...

why are we the first year to face this change

Reply 1341

Jitesh

14

Original post by 11...

yeah it was NO2 what am I saying. N2 o2 were the reactants. did we have to balance it.

yes and just checked the unofficial mark scheme and it says N2O so N2(g) + 1/2O2(g) on reactants if that's right

It was energy change of formation, so you had to apply that knowledge

Reply 1342

alfmeister

2

Original post by 11...

yeah it was NO2 what am I saying. N2 o2 were the reactants. did we have to balance it.

I would imagine so as it was enthalpy change of formation

Reply 1343

11...

9

Original post by Jitesh

WTH lol

Reply 1344

11...

9

18th of August aaaaaahhhhhhhhhhhhhhhh :frown:

Reply 1345

adamwall99

3

Original post by asinghj

sigma bond is direct overlap of orbitals and pi bond is sideways overlap of p orbitals

I wrote exactly this but I said sigma bonds are overlap of s orbitals. Depends on the mark scheme

Reply 1346

11...

9

this wait till results day is mad. didn't feel this as such last year but this year I feel quite scared cos unisssss
A2 course starts next week,. and am I feeling ready for this????? NO. I need a breakkkkkkk

Reply 1347

11...

9

Original post by Jitesh

yes and just checked the unofficial mark scheme and it says N2O so N2(g) + 1/2O2(g) on reactants if that's right

It was energy change of formation, so you had to apply that knowledge

where is the proper unofficial mark scheme cos the one on the other thread is unfinished and wrong in some places

Reply 1348

11...

9

where is the proper unofficial mark schemeeeeeeeeee

Reply 1349

11...

9

Hoping for low enough grade boundaries. Pls god

Reply 1350

11...

9

next year, we have to learn both year 12 stuff and year 13 stuff for two chem papers. double the content nooooo.

AAAA pls

Original post by 11...

where is the proper unofficial mark scheme cos the one on the other thread is unfinished and wrong in some places

I remember putting 0.5 in front of the O2(g)

Reply 1353

marioman

8

Original post by 11...

next year, we have to learn both year 12 stuff and year 13 stuff for two chem papers. double the content nooooo.

Most of the A2 content (especially organic) builds on the AS content.

Reply 1354

ronnydandam

9

Original post by 11...

this wait till results day is mad. didn't feel this as such last year but this year I feel quite scared cos unisssss
A2 course starts next week,. and am I feeling ready for this????? NO. I need a breakkkkkkk

bro a potential B won't hurt your medicine chances. You'd still get predicted an A dw

Reply 1355

ronnydandam

9

I just realised... for that pent-2-ene question, I did draw pent-2-ene but I wrote Z pent-3-ene... have I got a mark? Initially thought 2 marks lost there but maybe not?

Reply 1356

asinghj

16

Original post by ronnydandam

I just realised... for that pent-2-ene question, I did draw pent-2-ene but I wrote Z pent-3-ene... have I got a mark? Initially thought 2 marks lost there but maybe not?