Edexcel IAL Chemistry (WCH06/01) Chemistry Laboratory Skills II - 15th May 2015

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Abdel_97
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Hi
I didn't find any threads so decided to start that one
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AhmedBilal
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I'm sitting this exam
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Abdel_97
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Did anyone do the jan 2015 paper ?
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AhmedBilal
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I did. It was pretty tough. Especially the first question.
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thymolphthalein
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(Original post by AhmedBilal)
I did. It was pretty tough. Especially the first question.
Personally, I wouldn't call that question tough because we should already know how to do a flame test since it even comes in the 3B paper and thiosulfate is mentioned in earlier units as well.

I found parts of the titration and electrode potential question harder.
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Ripper Phoenix
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dude i already made a thread for this exam
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AhmedBilal
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(Original post by thymolphthalein)
Personally, I wouldn't call that question tough because we should already know how to do a flame test since it even comes in the 3B paper and thiosulfate is mentioned in earlier units as well.

I found parts of the titration and electrode potential question harder.

Yes those were hard too.
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newmexican101
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Could I have a link to the thread
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Abdel_97
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Do any of you guys have any revision notes for unit 6
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AhmedBilal
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Guys i'm confused. What exactly is the condition for the iodoform test? In some books it says that the compound needs to have a methyl carbonyl group attached whereas some say that secondary alcohols can also react.
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Abdel_97
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(Original post by AhmedBilal)
Guys i'm confused. What exactly is the condition for the iodoform test? In some books it says that the compound needs to have a methyl carbonyl group attached whereas some say that secondary alcohols can also react.
both tbh, I have also seen a one where a positive result was given due to a CH3-HC=0-CH3 a ketone
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thymolphthalein
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(Original post by AhmedBilal)
Guys i'm confused. What exactly is the condition for the iodoform test? In some books it says that the compound needs to have a methyl carbonyl group attached whereas some say that secondary alcohols can also react.
I was told that it is specific to 'organic compounds containing a methyl group next to a carbonyl group OR compounds that can react to give a methyl group next to a carbonyl group'.

So ethanal is the only aldehyde that can have a positive test, and all METHYL ketones will give a positive test as well.

Also ethanol can be oxidized to give ethanal by the iodine hence the test would be positive for it along with other METHYL alcohols, such as propan-2-ol? (Someone needs to confirm this part though.)
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salmaelserafi
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how was it guys?
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Nid03
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(Original post by salmaelserafi)
how was it guys?
It was okay-ish. Don't know what to say. Wbu?
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thymolphthalein
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I found it easy.
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salmaelserafi
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i was so unprepared for the melting temp exp

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thymolphthalein
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Hey, I PM-ed you since I've heard that we shouldn't discuss before 24 hours are up.

Edit: Hey I don't have all the answers, but if you have any doubts, send me a PM instead and I'll discuss with you off forum!
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AhmedBilal
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It was awful :/
What do you guys think the grade boundaries will be at?
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rachu
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(Original post by thymolphthalein)
Hey, I PM-ed you since I've heard that we shouldn't discuss before 24 hours are up.
could you PM me as well? thanks!
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chemcrazy
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(Original post by thymolphthalein)
Hey, I PM-ed you since I've heard that we shouldn't discuss before 24 hours are up.

could you pm me too please
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