Post by: Martoman on June 05, 2010, 03:39:29 pm
Post by: superflya on June 05, 2010, 03:45:23 pm
Post by: Stroodle on June 05, 2010, 04:00:37 pm
Post by: menashiiii on June 05, 2010, 04:11:50 pm
Post by: Stroodle on June 05, 2010, 04:15:38 pm
Post by: menashiiii on June 05, 2010, 04:21:58 pm
THere's a link somewhere. But here it is again :)thanks man!
Post by: Martoman on June 05, 2010, 04:22:23 pm
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
yeah and last question : It can be fermentation as well as a redox/oxidation *sigh* @ solutions.
Post by: stonecold on June 05, 2010, 04:25:03 pm
And yeah, water plus ethene = hydrolysis, as you are breaking the double bond.
Post by: Martoman on June 05, 2010, 04:25:49 pm
For the exams i think we'll wait for Mao to act as arbiter here.
Question says: What type of chemical reaction is this. Fermentation is as valid as oxidation.
~Alkene + water is hydration or addition. It's not hydrolosis as the molecule is not split.
~I got that one wrong too, for the exact same reason...
~Yeah, either.
I didn't know this. Thanks m@tty :-*. Previously my understanding was hydrolysis = water as a reactant.
Now hydrolysis = water as reactant and splits molecule.
Damn it, in the NEAP book, they say it is hydrolysis. >:(
Lol this is where i was basing my knowledge off!
Post by: Stroodle on June 05, 2010, 04:26:54 pm
I thought hydrolysis was just the chemical breakdown of a compound due to reaction with water.
Post by: m@tty on June 05, 2010, 04:27:14 pm
~I got that one wrong too, for the exact same reason...
~Yeah, either. Though I'd say the more chemist like answer would be redox/oxidation.
Post by: stonecold on June 05, 2010, 04:28:48 pm
Post by: Stroodle on June 05, 2010, 04:31:42 pm
Post by: Martoman on June 05, 2010, 04:34:09 pm
It challenges your preconceptions.
Like i only ever think of an atom as one not as in kagillions. When it asks for number of electrons im like.... yeah 2 electrons :-\
Post by: m@tty on June 05, 2010, 04:36:43 pm
What's question 17? Can't be bothered finding this exam...
Post by: Martoman on June 05, 2010, 04:42:40 pm
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
Post by: m@tty on June 05, 2010, 04:43:09 pm
Post by: matty.k on June 05, 2010, 04:50:36 pm
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
Post by: menashiiii on June 05, 2010, 05:08:06 pm
-.-
Post by: Greggler on June 05, 2010, 05:23:05 pm
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.
Post by: menashiiii on June 06, 2010, 12:34:09 am
what is hydration????
Post by: Martoman on June 06, 2010, 12:38:37 am
Post by: menashiiii on June 06, 2010, 01:16:11 am
where is this in heinemann chem 2?
Post by: Martoman on June 06, 2010, 01:17:58 am
heinemann isn't the be-all-end-all of existence.
Post by: 8039 on June 06, 2010, 10:42:08 am
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 havethen 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
Post by: 8039 on June 06, 2010, 11:08:33 am
For Q.11 I can only find 3 environments (CH3 on both sides being same) can someone help?
Post by: Martoman on June 06, 2010, 11:54:05 am
Post by: Blakhitman on June 06, 2010, 12:28:19 pm
Lucky I came across this thread today!
Post by: Studyinghard on June 06, 2010, 12:46:01 pm
Post by: kenhung123 on June 06, 2010, 01:01:49 pm
Post by: menashiiii on June 06, 2010, 01:57:59 pm
totally suck at yield
>.<
Post by: chansthename on June 06, 2010, 02:12:07 pm
you would do amount (in g) obtained *100/ amount calculated possible.
so in this case 1*100/2 = 50%
Post by: m@tty on June 06, 2010, 02:13:47 pm
Post by: Martoman on June 06, 2010, 02:19:53 pm
Like I expect to get 100 marks out of 100 for a test.
But i only get 67 marks.
Iam so i am 67 parts out of 100 happy so 67/100 *100 = 67% yeild of happiness :smitten:
Post by: menashiiii on June 06, 2010, 02:27:46 pm
I think of it as how "happy I am" percentage.
lolllllll, great analogy :P
Post by: vexx on June 07, 2010, 12:28:06 am
exceptt the mark i lost was something i actually didn't know since i keep avoiding going over biofuels - i didn't know that the fermentation reaction of glucose had a 'general name' of oxidation reaction, so unless vcaa is nicer, i lost a mark for saying fermentation;p
it's fine though since the exam is out of 86 :D
Post by: Martoman on June 07, 2010, 12:29:23 am
Post by: vexx on June 07, 2010, 12:31:25 am
your happiness yield was 85 / 86 * 100 ?
haha pretty much, and i was expected the theoretical yield- but like aspirin that never happens><