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# AQA AS Chemistry, unit 1 watch

1. Remember with the ideal gas equation..

Pressure must be in Pa
Volume must be in m3
Constant = 8.31KJmol-1
Temp must be in K (to convert from degrees add 273)

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2. (Original post by a.jiwa)
concentration is moldm^3

and volume is dm^3 (you divide by 1000 because they usually give it in cm^3)

remember that or they might trick you!
Oh yeah thank you so much, I would have completely forgotten that
3. Quick question. When giving electronic configurations of atoms can you put in the Noble gas in brackets and then the rest of the configuration?

E.g. for Rubidium - [Kr] 5s1

instead of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1
4. Does anyone know how to convert units in the PV=nRT equation. I know degrees to k is +273. and if pressure is kPa to multiply by 1000. but the volume confuses me between the dm^3, m^3 and cm^3
5. (Original post by IWantSomeMushu)
Quick question. When giving electronic configurations of atoms can you put in the Noble gas in brackets and then the rest of the configuration?

E.g. for Rubidium - [Kr] 5s1

instead of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1
I got told no. Just to put the whole electron configuration to be sure.
6. (Original post by IWantSomeMushu)
Quick question. When giving electronic configurations of atoms can you put in the Noble gas in brackets and then the rest of the configuration?

E.g. for Rubidium - [Kr] 5s1

instead of 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1
I was told if it asks for the full electron configuration don't put the noble gas in
7. (Original post by swinnie0)
It's to do with it being more stable with a full/half full 3d orbital because it's a transition metal. It's in chem5, i wasn't aware you needed to know it in chem 1

I highly doubt it will come up tomorrow but i read it in the text book, didnt understand it at all but memorized it just incase! I havent seen it and others have informed me that they havent seen it in spec or past papers.

As long as aqa dont decide to mess with us then i dont think it will be in the paper. but better safe than sorry and it doesnt hurt to learn a sentence does it?
8. (Original post by Amy Corthine)
Does anyone know how to convert units in the PV=nRT equation. I know degrees to k is +273. and if pressure is kPa to multiply by 1000. but the volume confuses me between the dm^3, m^3 and cm^3
cm3 /1000 -> dm3 /1000 -> m3

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9. (Original post by swinnie0)
I was told if it asks for the full electron configuration don't put the noble gas in
Ugh, more work for just one mark.
10. (Original post by Areen5)
Oh yeah thank you so much, I would have completely forgotten that

11. (Original post by homefind)
Hi guys to get to m3 from cm3 do you divide by 1000000?

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Yes.

Centimetres

Divided by 1000

Decimetres

Divided by 1000

Metres
12. (Original post by Paulineuh)
I used to have this coloured periodic table which showed which is non-metal and metal xD That's how I just remembered it

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(Original post by homefind)
Because it isn't a metal?lol I don't know how to explain it lol, anyone else? erm well it isn't a transition and isn't in group 1 or 2

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This does it pretty well.

I'm gonna remember the staircase with the image of a running pencil.
Pencil (carbon) to Running (Running / Rn / Radon)
Meh, my brain works differently.
13. (Original post by NabRoh)

This does it pretty well.

I'm gonna remember the staircase with the image of a running pencil.
Pencil (carbon) to Running (Running / Rn / Radon)
Meh, my brain works differently.
Awesome

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14. Do atomic model questions ever come up?

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15. (Original post by homefind)
Do atomic model questions ever come up?

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Not that I know of/seen on an actual paper. However, at my school we did a mini-end of unit test once and there was a question on atomic model.
16. (Original post by homefind)
Do atomic model questions ever come up?

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Sorry what's that?
17. (Original post by Paulineuh)
Not that I know of/seen on an actual paper. However, at my school we did a mini-end of unit test once and there was a question on atomic model.
What was the Q like?

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18. (Original post by maryamnc)
Sorry what's that?
The spec states you need to be aware about atomic models (like Plum Pudding etc...) but I haven't seen Qs asking about them before.

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19. (Original post by homefind)
Do atomic model questions ever come up?

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No.
20. Hey does anyone know any good sites for revising organic chemistry.
fractional distillation and cracking and all that kind of stuff?

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