Official AQA GCSE Chemistry Unit 2 24th Janurary NEW SPEC Watch

Poll: What do you think the 6 marker will be?
Electrolysis of (metal) (14)
22.95%
Gas chromotography and Mass spectrometry (19)
31.15%
Atomic structure and bonding (5)
8.2%
Polymers (10)
16.39%
Explaining the process of a experiment (8)
13.11%
Other (please leave your suggestion) (5)
8.2%
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qjohir20
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#101
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#101
can someone give me a hard question please?
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sakbo
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#102
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#102
(Original post by king_revision)
I hope tomorrows exam poses a bit more of a challenge than the mock (June 2012 paper). I got 59/60 in the mock and I lost the one because I stupidly read the graph as saying 20 rather than 21.
WOW you're both good at chemistry AND modest! :congrats:
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Mrkingpenguin
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#103
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#103
(Original post by BI0)
Heres my 6-mark GC-MS answer.

The sample is vaporised. An unreactive carrier gas is injected which carries the sample through the coiled column. The compounds in the sample have different forces of attraction to the solid material in the column walls, meaning they will move through the column at different speeds. The compounds will have a different retention time. When the compounds reach the detector, a chart (chromatograph) is plotted. The mass spectrometer draws a mass spectrum which corresponds to the molecular mass number and percent abundance of the compounds.
+ inert solid in column
+substance seperates and leaves at different times
+ also know why this is useful/downsides
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Kat187
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#104
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#104
(Original post by syhash)
Haha well I'd recommend myGCSEscience videos on youtube, just been making my way through all the C2 videos after only just discovering him!

I reckon it'll be a mix of everything to be honest, with lots of calculations thrown in! And after the biology, I think the 6 marker's likely to be something fairly unpredictable! Definitely think GC-MS and electrolysis will come up somewhere though
Im soo confused do we need to know about the haber process for the new spec C2
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08spencerk
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#105
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#105
(Original post by sakbo)
Quick question : if the exam question asks for one reason can you just list many reasons that you know to be safe? Or do they just take the first one?

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Lol I always do that - as long as they're right it's fine if you list a load of wrong answers and one right, depending on the examiner


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BI0
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#106
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#106
(Original post by Kat187)
Im soo confused do we need to know about the haber process for the new spec C2
The haber process has been moved to C3. It is no longer on the C2 specification.
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Kat187
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#107
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#107
(Original post by BI0)
The haber process has been moved to C3. It is no longer on the C2 specification.
Ohhh thanks i was really stressing out about it
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Kat187
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#108
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#108
What did you guys get in unit 1 chemistry C1 ?
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sakbo
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#109
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#109
(Original post by Kat187)
What did you guys get in unit 1 chemistry C1 ?
99
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bbadonde2
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#110
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#110
Do we need to know the exact process for purification of copper or is that C1?
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Kat187
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#111
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#111
(Original post by bbadonde2)
Do we need to know the exact process for purification of copper or is that C1?
I think we do my teacher recommended that we recap it use this web site http://www.bbc.co.uk/schools/gcsebit...ysisrev3.shtml
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chatty
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#112
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#112
(Original post by bbadonde2)
June 2012 paper for New spec! :
Chemistry:
QP - http://science.taskermilward.org.uk/...une 2012 H.pdf
MS - Can't find one, sorry!

I just types in paper code now and it came up!
Great. Thanks I've been looking for this paper for ages. Good Luck.
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qjohir20
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#113
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#113
(Original post by Mrkingpenguin)
what is the meaning of life?
Life has various meanings; you can either decide to focus on your exams, and try to get good grades, you can be carefree, and toss your books away, you can do various things in life. life is what you make of it.
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syhash
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#114
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#114
(Original post by bbadonde2)
Do we need to know the exact process for purification of copper or is that C1?
(Original post by Kat187)
I think we do my teacher recommended that we recap it use this web site http://www.bbc.co.uk/schools/gcsebit...ysisrev3.shtml
The purification of copper is C1, for C2 you just need to know how electrolysis can be used for copper plating - plating impure copper with pure copper!

EDIT: Someone negged me, sorry if I'm wrong! I'm just looking through the spec now, doesn't mention purification of copper anywhere!
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Mrkingpenguin
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#115
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#115
(Original post by qjohir20)
Life has various meanings; you can either decide to focus on your exams, and try to get good grades, you can be carefree, and toss your books away, you can do various things in life. life is what you make of it.
full marks
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Nicsi
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#116
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#116
What are reasons why an experiment might go wrong? Such human error but what else?


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BadAtRevising
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#117
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#117
Describe the two different structures of polymers and their uses in the real world. (6m)
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popburrow
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#118
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#118
(Original post by sakbo)
WAIT WHAT? :eek: Do we need to know the electrolysis of impure copper??? pretty sure that was unit 1. Can someone verify this for me please?? :confused:
Is that not like electroplating. Because it says that the impure copper is the positive electrode and negative electrode is pure?
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chatty
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#119
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#119
(Original post by Nicsi)
What are reasons why an experiment might go wrong? Such human error but what else?


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Could be
- • weighing error
- • error in measuring
- • timing error
- • change in temperature
- • recording / plotting error

Good luck.
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Meesh14
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#120
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#120
i watched all of them and i think hes soooo good. brilliant revision tool.... just wish all my teachers were like him....
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