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January 05, 2026, 01:42:10 am
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Author Topic: STAV 09  (Read 3821 times)  Share 

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Martoman

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Re: STAV 09
« Reply #15 on: June 05, 2010, 04:42:40 pm »
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The avagadro constant is the same as the number of

molecules in 16g of oxygen
electrons in 1 g of hydrogen gas
Atoms of 24g of carbon
ions in 1L of 1M sodium chloride solution
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m@tty

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Re: STAV 09
« Reply #16 on: June 05, 2010, 04:43:09 pm »
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Oh, I liked that question.. :P
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matty.k

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Re: STAV 09
« Reply #17 on: June 05, 2010, 04:50:36 pm »
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just think of it this way, hydrolysis is the exact opposite of condensation

condensation where monomers are joined and a water is condensed out

hydrolysis is the addition of water to a polymer to split it into its monomers
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menashiiii

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Re: STAV 09
« Reply #18 on: June 05, 2010, 05:08:06 pm »
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the link doesnt work when i print?!
-.-
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Greggler

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Re: STAV 09
« Reply #19 on: June 05, 2010, 05:23:05 pm »
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This was the first exam i ever did about 4 weeks ago.

Think i got ~90%

Short answer was a breeze and that hydrolysis one i was like wtf? I've always been told 'any' reaction at all involving water as a reactant could be called hydrolysis.
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menashiiii

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Re: STAV 09
« Reply #20 on: June 06, 2010, 12:34:09 am »
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what the shit was with Q18?!
what is hydration????
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Martoman

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Re: STAV 09
« Reply #21 on: June 06, 2010, 12:38:37 am »
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Adding h20 across the double bond
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2009: Math methods: 50, Psychology: 44
2010: chem 47, further 48, Spesh 49 fml seriously and other yr 11 subs.
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menashiiii

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Re: STAV 09
« Reply #22 on: June 06, 2010, 01:16:11 am »
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is that so..?
where is this in heinemann chem 2?
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Martoman

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Re: STAV 09
« Reply #23 on: June 06, 2010, 01:17:58 am »
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Eh wikipedia it.

heinemann isn't the be-all-end-all of existence.
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2009: Math methods: 50, Psychology: 44
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2011: Holidaying, screw school.
No. Not azn.
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8039

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Re: STAV 09
« Reply #24 on: June 06, 2010, 10:42:08 am »
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Quote from: Martoman on June 05, 2010, 04:22:23 pm
LAWL i lost 4 as well. 3 actually, i need to learn to count

Still don't like this question tho, 18:

1-propene reacts with H20

Is this a hydration or hydrolysis? Its both!?.... bad question i think.

Also q1 if you have then you have to consider the effect of 2 in the oxidation equation.... T.T I usually ignore the coefficients but it not a coefficient is it....

yeah and last question : It can be fermentation as well as a redox/oxidation *sigh* @ solutions.

Goddamn Heinemann...

Ok so simply put, hydration is water molecules being added to a substance... hydrolosis breaks the substance down
« Last Edit: June 06, 2010, 10:52:19 am by 8039 »
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8039

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Re: STAV 09
« Reply #25 on: June 06, 2010, 11:08:33 am »
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I went with molecules in 16g of oxygen... I'm screwed -_-

For Q.11 I can only find 3 environments (CH3 on both sides being same) can someone help?
« Last Edit: June 06, 2010, 11:18:09 am by 8039 »
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Martoman

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Re: STAV 09
« Reply #26 on: June 06, 2010, 11:54:05 am »
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It aint symmetrical, so they are all in different environments.
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2009: Math methods: 50, Psychology: 44
2010: chem 47, further 48, Spesh 49 fml seriously and other yr 11 subs.
2011: Holidaying, screw school.
No. Not azn.
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Blakhitman

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Re: STAV 09
« Reply #27 on: June 06, 2010, 12:28:19 pm »
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I thought hydrolysis was the splitting of water? I would've put hydrolysis as well.

Lucky I came across this thread today!
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Studyinghard

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Re: STAV 09
« Reply #28 on: June 06, 2010, 12:46:01 pm »
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Think of hydration as opposed to dehydration. When your dehydrated you have no water but when your hydrated you have water.
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kenhung123

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Re: STAV 09
« Reply #29 on: June 06, 2010, 01:01:49 pm »
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STAV 08 is so weird..I can't say its hard its just that the questions they ask aren't really chemistry...
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