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

So you know there is 0.5 of X and Y and at the start there is 0 moles of Z
At equilibrium Z=0.2 moles
So that means X=0.5-0.2
And Y=0.5-(2*0.2) because Y is two moles so times by 2

Thanks, You could have just kept that other method you posted, we weren't taught that. Also, What is the formula of calcium nitrate(V)? . From this I understood that calcium has a charge of 5+ and NO3 should have a charge of -1 but non of the options give a valid equation

Reply 201

Ash Kay

7

Who's ready for tomorrow? I'm so nervous. Any idea on the topics?

Reply 202

Clintbarton

14

Original post by Ash Kay

Who's ready for tomorrow? I'm so nervous. Any idea on the topics?

Loads of maths. All miles. E/Z stuff. All the alcohol/alkane/alkenes experiment stuff. IR radiation it is All new spec stuff

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Reply 203

anaida_

Original post by Saaranjan

Thanks, You could have just kept that other method you posted, we weren't taught that. Also, What is the formula of calcium nitrate(V)? . From this I understood that calcium has a charge of 5+ and NO3 should have a charge of -1 but non of the options give a valid equation

The formula is Ca(NO3)2
Ca is +2
The (V) suggests the Nitrogen in Nitrate is +5 so therefore adds up to +10
The O is -2 x 3 = -6 x 2 = -12
Thus it has no overall charge

(edited 7 years ago)

Reply 204

cordeliaheath_

2

Original post by Clintbarton

Did bio today. So much easier than specimen. We gonna be okay

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yh was kinda straightforward really hopefully same for chemistry lmao

Reply 205

Ash Kay

7

Yeah. Thanks for that. I forgot some of those topics. Also remember Kc and pV=nRT

I hope it's alright. Hate the fact that the papers are synoptic

Original post by Clintbarton

Loads of maths. All miles. E/Z stuff. All the alcohol/alkane/alkenes experiment stuff. IR radiation it is All new spec stuff

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Reply 206

S.G.

22

We don't need to know about the old models of the atom do we? With Rutherford and Thompson

Reply 207

S.G.

22

Does anyone have the 2015 F321 and F322 papers?

Reply 208

MilindS99

7

I made a revision video for mechanisms for this new syllabus: https://www.youtube.com/watch?v=LUE6tj1-_z4

Reply 209

4nonymous

11

Original post by Saaranjan

Thanks, You could have just kept that other method you posted, we weren't taught that. Also, What is the formula of calcium nitrate(V)? . From this I understood that calcium has a charge of 5+ and NO3 should have a charge of -1 but non of the options give a valid equation

Yh my other method wasn't posting properly but thats what I normally use.

Calcium has 2+ charge
N in NO3 has a 5+ charge
O is 2- So -2*3=6
Now you need to balance it to give an overall charge of 0

So since ca is 2+
And NO3 give -1 that means you need two NO3 to get you to 0
so its Ca(NO3)2

Reply 210

TH3-FL45H

19

Original post by SGHD26716

We don't need to know about the old models of the atom do we? With Rutherford and Thompson

Its in the revision guide but I haven't revised it too much tbh

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Reply 211

IXxi HIIDA ixXI

15

Has anyone got any links or files, with exam questions by topic?

Reply 212

oni176

7

Original post by 4nonymous

Yes quite a lot of people found it easy. I found it ok I messed up a few but Im not that bothered. I expect there to be high grade boundaries for it to be honest.

I don't think a lot of people find it easy. Vast majority said it was hard or okay.

Reply 213

4nonymous

11

Original post by oni176

I don't think a lot of people find it easy. Vast majority said it was hard or okay.

Most people I've spoken too said it was easy. It was definitely easier than the specimen paper

Reply 214

Clintbarton

14

Predictions?

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Reply 215

whitingh

1

Original post by SGHD26716

We don't need to know about the old models of the atom do we? With Rutherford and Thompson

I hope not, cause I've done absolutely no revision whatsoever on that😁

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Reply 216

ashbawa

1

IR radiation was also on the old spec, I did it last year. The new areas are: rates from graphs, cahn-ingold, markownikoffs product rules, synthetic routes (knowing reagents and conditions, testing for ions (qualitative analysis), equilibrium constant, M+1 peak etc..

Reply 217

oni176

7

Original post by 4nonymous

Most people I've spoken too said it was easy. It was definitely easier than the specimen paper

I agree that it was easier than the specimen, and the multiple choice questions were not too challenging in comparison to the practice papers. However, as this is a new specification, the A grade will roughly be 73-75%. The old specification does not even award an A as 80%.

Reply 218

4nonymous

11

Original post by oni176

I agree that it was easier than the specimen, and the multiple choice questions were not too challenging in comparison to the practice papers. However, as this is a new specification, the A grade will roughly be 73-75%. The old specification does not even award an A as 80%.

That seems like a reasonable prediction.

Reply 219

Holdinhooo

1

That is true but the thing is that those past papers had more worded questions (which sounds reasonable as to why their boundaries were at around 70%) compared to the paper we did which had MCQs and mainly 2-3 markers, so it could be that the grade boundaries may not be as low as we'd expect :frown:

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

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