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November 01, 2025, 11:41:05 am
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Author Topic: Chemistry 3/4 2013 Thread  (Read 448756 times)  Share 

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Aurelian

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Re: Chemistry 3/4 2013 Thread
« Reply #210 on: January 18, 2013, 09:59:22 pm »
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Quote from: rhinoking96 on January 18, 2013, 09:51:30 pm
Is anyone else just a little scared for the end of year exam, it's 2.5hrs  ??? that's almost as long as the English exam and both units pulled together on one examination paper  :(

If it makes you feel better, all my science exams at uni are three hours :P
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thushan

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Re: Chemistry 3/4 2013 Thread
« Reply #211 on: January 18, 2013, 11:34:02 pm »
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Quote from: Aurelian on January 18, 2013, 09:59:22 pm
If it makes you feel better, all my science exams at uni are three hours :P

Melbourne MD med exam at 3rd year is 5 hours.
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McFleurry

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Re: Chemistry 3/4 2013 Thread
« Reply #212 on: January 18, 2013, 11:55:18 pm »
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Oh golly.  :(  :(  :(
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Edward21

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Re: Chemistry 3/4 2013 Thread
« Reply #213 on: January 18, 2013, 11:58:21 pm »
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Quote from: TRex on January 18, 2013, 11:34:02 pm
Melbourne MD med exam at 3rd year is 5 hours.
I don't understand the logic of that, how is testing someone's ability over 5 hours of benefit? It's ridiculous  :o
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thushan

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Re: Chemistry 3/4 2013 Thread
« Reply #214 on: January 19, 2013, 12:06:18 am »
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Quote from: rhinoking96 on January 18, 2013, 11:58:21 pm
I don't understand the logic of that, how is testing someone's ability over 5 hours of benefit? It's ridiculous  :o

I suspect (ask Russ) that it's the horrible barrier exam that tests every aspect of Medicine required to be learnt in medical school.

Monash has one too in 4th year, but its only 3 hours (thank god!).
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Mr Keshy

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Re: Chemistry 3/4 2013 Thread
« Reply #215 on: January 19, 2013, 07:47:43 am »
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I dunno, maybe they're testing pressure and concentration as well?

(inb4 Charles law and c=n/v)
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thushan

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Re: Chemistry 3/4 2013 Thread
« Reply #216 on: January 19, 2013, 09:43:46 am »
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Quote from: Machan on January 19, 2013, 07:47:43 am
I dunno, maybe they're testing pressure and concentration as well?

(inb4 Charles law and c=n/v)

LOL or pV = nRT :P

I admit, when I saw that I legit thought pressure and concentration in chemistry terms. Took me a while to get what you actually meant :P
This is what Chemistry does to you...
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Re: Chemistry 3/4 2013 Thread
« Reply #217 on: January 19, 2013, 09:58:19 am »
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Quote from: TRex on January 19, 2013, 09:43:46 am
LOL or pV = nRT :P

I admit, when I saw that I legit thought pressure and concentration in chemistry terms. Took me a while to get what you actually meant :P
This is what Chemistry does to you...

Haha, I realised after I typed it up!
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Math Nerd

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Re: Chemistry 3/4 2013 Thread
« Reply #218 on: January 19, 2013, 10:51:08 pm »
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A weather ballon was filled with 187 mole of helium gas at STP. Under these conditions the balloon had a radius of 1m. The balloon was allowed to rise a height of 60km where the pressure was 100 Pa and temperature 200K. Assume the ballon was sphereical (V=4/3pir^3)
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Reckoner

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Re: Chemistry 3/4 2013 Thread
« Reply #219 on: January 20, 2013, 05:13:16 pm »
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^ Where's the question?  :P



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Mr Keshy

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Re: Chemistry 3/4 2013 Thread
« Reply #220 on: January 20, 2013, 05:16:13 pm »
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Haha I was wondering too, I'm guessing it's the volume of helium or something.. Scratch that, not too sure..
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Re: Chemistry 3/4 2013 Thread
« Reply #221 on: January 20, 2013, 05:27:03 pm »
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yeh find the radius
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Reckoner

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Re: Chemistry 3/4 2013 Thread
« Reply #222 on: January 20, 2013, 06:54:16 pm »
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What do we need to find the radius of the balloon? The volume! And we can then use the formula provided in the question.

Now to find the volume we look at the other information given to us. We have the number of moles of gas in the balloon, the temperature of the balloon, and the pressure. Now if we look into our formula bank, we see that we have a formula which links the values that we do know (P, T,n) with the unknown (V).

The radius of the balloon originally is not necessary!

I'm on my phone and haven't figured out how to do equals signs lol so won't do the calcs. If you have any problems I'm sure someone could do them for you. Updated

Spoiler
Using the values (units should be in kPa, not Pa)









Convert to m3 so our radius is in metres gives us



Then to find the radius













I hope haha
 
« Last Edit: January 20, 2013, 10:39:32 pm by lpe »
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teletubbies_95

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Re: Chemistry 3/4 2013 Thread
« Reply #223 on: January 21, 2013, 11:51:43 am »
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Thanks ipe! Great explanation. I was stuck after the pv= nrt , cause I completely forgot a volume of sphere thingo! Thanks!
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Edward21

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Re: Chemistry 3/4 2013 Thread
« Reply #224 on: January 21, 2013, 01:00:45 pm »
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How about a pH question?
1X10^-4 M CH3COOH solution? I'm stuck because none of my answers fit the MC options (4,5,7,9)
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