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P2 Additional Science Next week!!

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For people who are doing a resit for P2, do you understand how u messed up first time?. I can't understand. I found the paper so easy yet I still slipped up. I don't know what I slipped up on, that's what scares me.

what grade did you get??

Reply 41

tempera

All the people on the real mint side come put ur hands up because Im gonna do the p2 tommorow

Reply 42

username963570

Original post by kILLERm

yeah i paid 8 quid and had my January 2012 paper returned to me so i could jhave a look where i went wrong, and not surprised where i went wrong i found jan 2012 much harder than past papers, thankfully p2 June grade boundaries are always low

Reply 43

shyamshah

Can anyone explain to me what a control rod does? Thank you in advance :smile:

Reply 44

username963570

A control rod absorbs surplus neutrons in a chain fission reaction, to keep it under control :smile:

Reply 45

krisshP

Original post by khalidpatel

Right guys lets keep the thread abit more lively can somebody explain the difference between nuclear fission and fusion??

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Fusion is where two small atomic nuclei join together (FUSE together) to form a bigger and heavier nucleus.

In fission either Uranium-235 or Plutonium-239 gets used as the fuel. There may be question on stating another fuel which gets used in fission so be prepared.

Fission is where a neutron gets absorbed by either Plutonium-239 or Uranium-235, releasing 2 or 3neutrons, energy and two nuclei. One of the two released neutrons would then be absorbed by further uranium-235 nucleus or plutonium-239 and so on. This is why fission is a called a controlled CHAIN reaction.

Nuclear Fusion occurs in stars and the Sun. A question paper for higher did ask where it occurs naturally.

That's all you need to know for fission and fusion.

Reply 46

krisshP

Original post by shyamshah

Can anyone explain to me what a control rod does? Thank you in advance :smile:

The control rod would absorb neutrons. The proportion of neutrons absorbed by the control rods would increase if the rods are lowered in the reactor. Therefore when the control rods get lowered, a smaller proportion of neutrons get absorbed by the fuel rods (where fission occurs). As there are less neutrons for fission to occur, the chain reaction is controlled due to less energy released.

Make sure you know the above. In one higher paper for P2 they asked about the effect of lowering the control rods in a nuclear fission reactor.

Reply 47

krisshP

Original post by Fas

What could you say if the question was " State one factor which affects cars distance during driver reaction time"

Thinking Distance affected by:
Drugs
Tiredness
Alcohol

Reply 48

shyamshah

Original post by krisshP

The control rod would absorb neutrons. The proportion of neutrons absorbed by the control rods would increase if the rods are lowered in the reactor. Therefore when the control rods get lowered, a smaller proportion of neutrons get absorbed by the fuel rods (where fission occurs). As there are less neutrons for fission to occur, the chain reaction is controlled due to less energy released. Make sure you know the above. In one higher paper for P2 they asked about the effect of lowering the control rods in a nuclear fission reactor.

Thank you, yeah I did that paper too. :smile:

Reply 49

khalidpatel

Guys do u think Rutherford stuff will be in tomorrows exam? Because it all ready came in jan??

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Reply 50

non

Who's doing new spec and who's doing old spec?

Reply 51

YNWA

Highly doubt that the nuclear model or the plum pudding model will come up, but revise it anyway, you just never know with aqa :rolleyes:

Reply 52

khalidpatel

Ahh true... I think everybody on this thread is doing old spec

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Reply 53

non

I'm doing new spec and it's tomorrow. Have you got any tips for something who's doing paper for the first time.

(edited 11 years ago)

Reply 54

shyamshah

Do we need to revise any formulas or are we given all of them?

Reply 55

khalidpatel

They give u the formulas but make sure u know the units!!

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Reply 56

shyamshah

Original post by khalidpatel

They give u the formulas but make sure u know the units!! This was posted from The Student Room's iPhone/iPad App

Thank you

Reply 57

kILLERm

Original post by khalidpatel

what grade did you get??

B. It's a poor performance, considering that I got predominantly A*s along with a few As in my past papers.

For everyone doing the paper, my tip is to not panic. It wont get u anywhere if u do. I remained calm throughout my C2 paper and I barely made mistakes (approx 40/45). By panicing, u only drop easy marks as your brain switches off. Trust me.

Reply 58

krisshP

Original post by khalidpatel

Guys do u think Rutherford stuff will be in tomorrows exam? Because it all ready came in jan??

This was posted from The Student Room's iPhone/iPad App

No as a big question on the nuclear model and the plum pudding model came recently.