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<a https://www.thestudentroom.co.uk/showthread.php?t=7467335'> Year 12s: what will be the first way you research your future options? >>
<a https://www.thestudentroom.co.uk/showthread.php?t=7467335'> Year 12s: what will be the first way you research your future options? >>
<a https://www.thestudentroom.co.uk/showthread.php?t=7467335'> Year 12s: what will be the first way you research your future options? >>

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***AQA AS UNIT 3B CHEMISTRY 2006 Practical EXAM***

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Reply 20
Avatar for lufiaguy
lufiaguy
6
datr
It causes the Mr to increase.

The ammount of liquid was already measured before the liquid was lost.

Then becuase less liquid was in the syringe less gas was produced, so when using the pV=nRT equation the number of moles worked out will be less than what it should be for the measured mass.

When working out the Mr you use the equation:

Mr=m/n

Becuase n is on the bottom and is smaller it actually makes the overall value larger. I didn't think this was a nice question at all.

Darn it! I rushed this question and didn't look at the equation properly. Nooooooo!

It looks like quite a lot of people found this paper tough today. Hopefully the grade boundaries will reflect that?
Reply 21
Avatar for Monkey_Boy
Monkey_Boy
I think if people have done pretty bad on this paper nation wide then they will have to reduce the grade boundaries:confused:
Reply 22
Avatar for sunday
sunday
I resat this paper too and it was so much harder than last years, and all the past papers! Ick :frown: Was hoping to really boost the C I got in mod3 last year. My planning was sooo bad.
Glad it wasn't just me that found the planning hard. I'm terrified about the A2 one this week, not sure what to learn, any ideas?

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