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OCR Chemistry F322~ 4th June 2013~ AS Chemistry

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Thanks Jimmy!

how is everyone feeling about this exam? as the Jan 2013 was reasonably good and unit 1 paper in may 2013 was really easy I think this is going to be either hard or doable.

Reply 2262

ThatScienceGuy

I just looked over the specification and it seems we don't need to state Hess' Law?

Can anyone confirm this ??

Reply 2263

JimmyA*

Heres more questions people forget. What type of UV light does the ozone absorb? What UV light causes skin cancer? How does the ozone layer work?

Reply 2264

Namod

Thanks Jimmy!

(Might just say it as well to get a thumbs up)

Reply 2265

Shaadi Baba

Could anyone pls help me with question 6c)i on June 2010 paper?

http://www.ocr.org.uk/Images/65130-question-paper-unit-f322-chains-energy-and-resources.pdf

Reply 2266

Beanjamin

Original post by sohailkm96

Sorry I don't think I typed out it correctly, I meant that a high atom economy shows a high amount reactants is being converted to the desired product.

Is this sohail from beckfoot school lol?

Reply 2267

simifeltham

Suggest two factors that affect the contribution of a greenhouse gas to global warming (2)

Reply 2268

d.adrian

Original post by Shaadi Baba

Could anyone pls help me with question 6c)i on June 2010 paper?

http://www.ocr.org.uk/Images/65130-question-paper-unit-f322-chains-energy-and-resources.pdf

On same question:
(c) Only a small proportion of the candidates in (i) realised that the 909 kJ of heat released
comes from 4 mol of NO; so the correct answer was 5.68 × 107 kJ.
In (ii), candidates needed to be more specific in their answers – it was not sufficient to write that
energy would be provided.

IDK how to do it though

Reply 2269

sohailkm96

Original post by Beanjamin

Is this sohail from beckfoot school lol?

Lol Ben yeah it's me.

Reply 2270

Beanjamin

Original post by JimmyA*

Heres more questions people forget. What type of UV light does the ozone absorb? What UV light causes skin cancer? How does the ozone layer work?

UV-C is absorbed by the ozone, both UV-B and UV-C can cause skin cancer, and I'm not sure about the last one, does it just absorb the UV?

Reply 2271

Namod

Original post by Beanjamin

Is this sohail from beckfoot school lol?

Don't tell me you are Ben from from beckfoot school?

Reply 2272

shomshomni

Hi everyone! Can anyone define le chatelier's principle for me?

Reply 2273

SheriB

Does anybody have the january 2013 and the mark scheme? Please can I have it? :colondollar:

Reply 2274

Beanjamin

Original post by sohailkm96

Lol Ben yeah it's me.

Hahah that's well funny, so are you feeling prepared for the exam?

Reply 2275

Sara_A

Original post by simifeltham

Suggest two factors that affect the contribution of a greenhouse gas to global warming (2)

The absorption of infrared radiation and the atmospheric concentration

Reply 2276

imary

Original post by Shaadi Baba

Could anyone pls help me with question 6c)i on June 2010 paper?

http://www.ocr.org.uk/Images/65130-question-paper-unit-f322-chains-energy-and-resources.pdf

You divide the enthalpy change by four to find the enthalpy change for 1 mole of NO. Then you multiply it by the number of moles given to find energy

Reply 2277

simifeltham

Original post by Sara_A

The absorption of infrared radiation and the atmospheric concentration

make sure you say the the IR absorption depends on the type of bond present. also the lifetime of ghgs

Reply 2278

karenkaur

Original post by JimmyA*

Here's a few good questions:
Why does the pi-bond break and not the sigma bond?(it's a question which alot of people forget and hasn't come up for a while)
What is the advantage of using the ziegler-natta process over radical polymerisation?
What are the current problems with storing Carbon in stable minerals?