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Author Topic: Bazza's 3/4 chemistry questions  (Read 32415 times)  Share 

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charmanderp

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Re: Bazza's 3/4 chemistry questions
« Reply #105 on: October 01, 2012, 09:54:12 pm »
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Yeah hydroxides are insoluble with a number of cations so they wouldn't be a very suitable electrolye.

The oxidation of H+ isn't likely to happen because H2(g) in alkaline conditions is a stronger reductant and hence will be oxidised preferentially.
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WhoTookMyUsername

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Re: Bazza's 3/4 chemistry questions
« Reply #106 on: October 01, 2012, 11:24:32 pm »
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Thanks for the help everyone :)
I understand... it was actually so simple lol... strongest reductant and strongest oxidant... *sigh* :X
sorry!
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Re: Bazza's 3/4 chemistry questions
« Reply #107 on: October 18, 2012, 06:09:45 pm »
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What unit is enthalpy in?
I thought it was just joules as its change in energy,
But then i realised for reactions its kj/mol?
Confused!
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charmanderp

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Re: Bazza's 3/4 chemistry questions
« Reply #108 on: October 18, 2012, 06:32:50 pm »
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Quote from: Bazza16 on October 18, 2012, 06:09:45 pm
What unit is enthalpy in?
I thought it was just joules as its change in energy,
But then i realised for reactions its kj/mol?
Confused!
Either joules or kilojoules (or megajoules, etc) per mol.
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Aurelian

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Re: Bazza's 3/4 chemistry questions
« Reply #109 on: October 18, 2012, 06:56:37 pm »
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Quote from: Bazza16 on October 18, 2012, 06:09:45 pm
What unit is enthalpy in?
I thought it was just joules as its change in energy,
But then i realised for reactions its kj/mol?
Confused!

The "per mol" just reflects the fact that the given enthalpy change represents "one lot" (in mol) of the equation with which it is associated.
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charmanderp

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Re: Bazza's 3/4 chemistry questions
« Reply #110 on: October 18, 2012, 07:01:28 pm »
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Quote from: Aurelian on October 18, 2012, 06:56:37 pm
Quote from: Bazza16 on October 18, 2012, 06:09:45 pm
What unit is enthalpy in?
I thought it was just joules as its change in energy,
But then i realised for reactions its kj/mol?
Confused!

The "per mol" just reflects the fact that the given enthalpy change represents "one lot" (in mol) of the equation with which it is associated.
Yup, and then you use the coefficients of the species in the equation to find out how much energy 1 mole of that particular chemical releases in the specified reaction.
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WhoTookMyUsername

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Re: Bazza's 3/4 chemistry questions
« Reply #111 on: October 18, 2012, 10:09:05 pm »
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ahk thanks,
what if it it gave you an energy profile and asked for change in H or something similar? Would you just give it in terms of J then?
Woudl you ever give enthalpy in terms of J only?
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charmanderp

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Re: Bazza's 3/4 chemistry questions
« Reply #112 on: October 19, 2012, 12:14:11 am »
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Quote from: Bazza16 on October 18, 2012, 10:09:05 pm
ahk thanks,
what if it it gave you an energy profile and asked for change in H or something similar? Would you just give it in terms of J then?
Woudl you ever give enthalpy in terms of J only?
Don't quote me on this (brain is a little fuzzy at this time of night) but you should probably go with whatever unit is used on the y-axis. I can't see that it would ever require you to give it in terms of J only, because that information is more or less useless in terms of actual application. I'll check tomorrow.
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WhoTookMyUsername

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Re: Bazza's 3/4 chemistry questions
« Reply #113 on: November 09, 2012, 07:56:49 pm »
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Got 3 chem exams left in me,
Done about 5, 1 or 2 VCAA,
what should i spend these 3 exams on?
all VCAA?
or a split?
what companies should i do?
Thanks! (I'd be happy with any A+ if that's relevant)
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pi

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Re: Bazza's 3/4 chemistry questions
« Reply #114 on: November 09, 2012, 07:58:53 pm »
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Just do VCAA imo
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charmanderp

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Re: Bazza's 3/4 chemistry questions
« Reply #115 on: November 09, 2012, 09:25:41 pm »
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VCAA and then Lisachem.
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WhoTookMyUsername

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Re: Bazza's 3/4 chemistry questions
« Reply #116 on: November 09, 2012, 09:29:15 pm »
+1
got an 11/20 MC the other day.. D:
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Shenz0r

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Re: Bazza's 3/4 chemistry questions
« Reply #117 on: November 10, 2012, 07:07:10 pm »
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Quote from: Bazza16 on November 09, 2012, 09:29:15 pm
got an 11/20 MC the other day.. D:

WOOO I GOT 12/20 ON LISACHEM 2012
HIGH FIVE

I swear my Chemistry knowledge has gone so careless this exam period, making so many idiotic mistakes...
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Hutchoo

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Re: Bazza's 3/4 chemistry questions
« Reply #118 on: November 10, 2012, 07:09:41 pm »
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Quote from: Shenz0r on November 10, 2012, 07:07:10 pm
Quote from: Bazza16 on November 09, 2012, 09:29:15 pm
got an 11/20 MC the other day.. D:

WOOO I GOT 12/20 ON LISACHEM 2012
HIGH FIVE

I swear my Chemistry knowledge has gone so careless this exam period, making so many idiotic mistakes...

I share your pain </3
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pi

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Re: Bazza's 3/4 chemistry questions
« Reply #119 on: November 10, 2012, 08:22:41 pm »
+4
If it makes you guys feel any better, just tried lisachem '12 MCQ and got 7. LOL
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