chemistry unit 4 aqa asymmetric carbon atoms?

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pureandmodest
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http://filestore.aqa.org.uk/subjects...4-QP-JAN13.PDF

question 4a)i
i don't get it

i get what it means [i think?] but getting the answer wrong
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Kallisto
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Do you know what asymetric means? It means that every single carbon atom has four different bonds which are chiral. Chiral means that their structure is identical, but mirror-inverted. Here is an example:

http://upload.wikimedia.org/wikipedi..._hands.svg.png

As far as I understand the task you should draw such chiral molecules.
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zilly1
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(Original post by pureandmodest)
http://filestore.aqa.org.uk/subjects...4-QP-JAN13.PDF

question 4a)i
i don't get it

i get what it means [i think?] but getting the answer wrong

An asymmetric carbon is attached to 4 different atoms or groups.

Example, The asymmetric carbon atom is the one attached to two carbon atoms, an oxygen atom, and a hydrogen atom. One may initially be inclined to think this atom is not asymmetrical because it is attached to two carbon atoms, but because those two carbon atoms are not attached to exactly the same things, there are two different groups of atoms that the carbon atom in question is attached to, therefore making it an asymmetric carbon atom

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zilly1
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(Original post by pureandmodest)
http://filestore.aqa.org.uk/subjects...4-QP-JAN13.PDF

question 4a)i
i don't get it

i get what it means [i think?] but getting the answer wrong

How many can you find for the question?
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pureandmodest
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(Original post by zilly1)
How many can you find for the question?
it's either 3 or 4
i'm not sure about the threonine. the one directly attached to the carbonyl c=o bond is asymmetrical, right?
but i'm not sure about the one above that. the one with the h-c-oh bond?
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zilly1
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(Original post by pureandmodest)
it's either 3 or 4
i'm not sure about the threonine. the one directly attached to the carbonyl c=o bond is asymmetrical, right?
but i'm not sure about the one above that. the one with the h-c-oh bond?

It's 4, the h-c-oh is because although attached to 2 carbons they are in different environments.
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pureandmodest
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(Original post by zilly1)
It's 4, the h-c-oh is because although attached to 2 carbons they are in different environments.
ohh okay!
thankyou so much, i was so confused about this but it makes sense now
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zilly1
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(Original post by pureandmodest)
ohh okay!
thankyou so much, i was so confused about this but it makes sense now
Pleasure, good luck in your exams (I got my degree in applied chemistry in 2005).
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