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# AS Chemistry- helping each other out! watch

1. With 2 hours to go till the exam, the only thing messing me up in past papers are the equations we have to learn in group 7, 2, extraction of metals and reaction of alcohols. Has anyone got any tips on how to learn these? Please
2. (Original post by C0balt)
When the values are added together the uncertainty is added together, so in this case 0.04+0.04 which is basically. 0.04*2=0.08
Divide by the total volume which gives 0.08/20=0.4%

(0.04/10)*2 is when you have two values which are multiplied. Volume can't be multiplied by volume though

When you might want to multiply is when you have a square for example, and you use a ruler with uncertainty 0.5cm and you measure a side 10cm. Thenyou will square the side. When you squared you multiply the percentage uncertainty by two, so 2(100*0.5/10)

Pay a visit to physics forums, and there's a sticky about uncertainty with all the rules, it explains better
I still don't 100% get what's going on, but as there's a rule I'll follow it. Thank you for your help!
3. (Original post by TheGreatImposter)
No where exactly am I meant to find it?
https://www.thestudentroom.co.uk/g/profile/resources

With 2 hours to go till the exam, the only thing messing me up in past papers are the equations we have to learn in group 7, 2, extraction of metals and reaction of alcohols. Has anyone got any tips on how to learn these? Please
What exam board are you on. I don't think you need to know group 2 on ocr a f322

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5. (Original post by TheNoobishKnight)
What exam board are you on. I don't think you need to know group 2 on ocr a f322

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I'm on OCR B. The questions I made were all from information that my teacher gave me. It is combined F331 and F332, sorry.
6. how did everyone find it? i thought it was ok
7. I did Edexcel Our paper was niceeee
8. how do you work out enthalpy change of reaction from enthalpy change of formation info
9. (Original post by Don Pedro K.)
I did Edexcel Our paper was niceeee
GCE?

I did Edexcel IAL.

Our entire section B (about 23 marks) was Green Chemistry. ALL OF IT.

Section C had some organics and some mass-IR.

Literally ALL the other topics were shoved into the 20 MCQs.

Weird paper.
10. (Original post by thymolphthalein)
GCE?

I did Edexcel IAL.

Our entire section B (about 23 marks) was Green Chemistry. ALL OF IT.

Section C had some organics and some mass-IR.

Literally ALL the other topics were shoved into the 20 MCQs.

Weird paper.
I did As level Edexcel Chem (not IAL) xD

THAT SOUNDS HORRIBLE BTW
11. (Original post by Don Pedro K.)
I did As level Edexcel Chem (not IAL) xD

THAT SOUNDS HORRIBLE BTW
Yeah GCE is the AS level Edexcel for non international centers.

Hahah, oh yeah I forgot there was a titration but that's pretty standard. And it was about removal of hair from a brown coloured cow...?

And the organic part was about compounds in smelly foot swear and urine. I think they went mad, honestly.

I didn't find it difficult just weird. But apparently lots of other people found it tough.
12. (Original post by thymolphthalein)
Yeah GCE is the AS level Edexcel for non international centers.

Hahah, oh yeah I forgot there was a titration but that's pretty standard. And it was about removal of hair from a brown coloured cow...?

And the organic part was about compounds in smelly foot swear and urine. I think they went mad, honestly.

I didn't find it difficult just weird. But apparently lots of other people found it tough.
Hopefully that means your boundaries will be low and you'll ace it!
13. (Original post by lerjj)
Hopefully that means your boundaries will be low and you'll ace it!
Hopefully!

I missed an A by a few marks the previous session so I'd really like one this time.
14. Is there an unofficial mark scheme yet?
15. (Original post by cowie)
Is there an unofficial mark scheme yet?
Which board

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16. (Original post by C0balt)
Which board

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AQA unit 2 chem
17. (Original post by cowie)
AQA unit 2 chem
Oh ok I made one for edexcel :/
18. (Original post by C0balt)
Oh ok I made one for edexcel :/
Ah right don't worry!
19. Help please........ the ans is B

Which of these equations represents the reaction of sulphur dioxide with an excess of aqueous

sodium hydroxide?

A SO2 + NaOH ----> NaHSO3

B SO2 + 2NaOH -------> Na2SO3 + H2O

C SO2 + 2NaOH ------> Na2SO4 + H2O

D SO2 + 2NaOH -----> Na2SO4 + H2
http://s11.postimg.org/980xvhyv7/table.jpg
The Ans is A......

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