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July 28, 2025, 12:12:16 pm
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Author Topic: Chemistry Examination Discussion  (Read 69450 times)  Share 

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ch

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Re: Chemistry Examination Discussion
« Reply #135 on: November 12, 2013, 06:28:16 pm »
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For the reaction pathway did they ask for semi structural or structural?
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Stick

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Re: Chemistry Examination Discussion
« Reply #136 on: November 12, 2013, 06:29:19 pm »
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Semi-structural - they would've provided more space for structural formulae anyway.
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thushan

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Re: Chemistry Examination Discussion
« Reply #137 on: November 12, 2013, 06:31:48 pm »
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A really awesome teacher has kindly sent me the exam, except it's too large to upload here. Use this link:

https://www.dropbox.com/s/f4zfnz1jegmxadi/img-Y12181332-0001.pdf

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Stick

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Re: Chemistry Examination Discussion
« Reply #138 on: November 12, 2013, 06:32:28 pm »
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Yay! We finally got a copy. :)
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charmanderp

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Re: Chemistry Examination Discussion
« Reply #139 on: November 12, 2013, 06:33:17 pm »
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Quote from: thushan on November 12, 2013, 06:31:48 pm
A really awesome teacher has kindly sent me the exam, except it's too large to upload here. Use this link:

https://www.dropbox.com/s/f4zfnz1jegmxadi/img-Y12181332-0001.pdf


HALLELUJAH.
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Reckoner

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Re: Chemistry Examination Discussion
« Reply #140 on: November 12, 2013, 06:34:01 pm »
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Quote from: thushan on November 12, 2013, 06:31:48 pm
A really awesome teacher has kindly sent me the exam, except it's too large to upload here. Use this link:

https://www.dropbox.com/s/f4zfnz1jegmxadi/img-Y12181332-0001.pdf
Legend :D
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ch

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Re: Chemistry Examination Discussion
« Reply #141 on: November 12, 2013, 06:43:16 pm »
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For the renewable energy sources I don't get it doesnt each alternative have a non renwable a coal, b coal, c diesel ( as it does not specifty biodiesel and d crude oil?
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lzxnl

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Re: Chemistry Examination Discussion
« Reply #142 on: November 12, 2013, 06:56:50 pm »
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Quote from: ch on November 12, 2013, 06:43:16 pm
For the renewable energy sources I don't get it doesnt each alternative have a non renwable a coal, b coal, c diesel ( as it does not specifty biodiesel and d crude oil?


Yeah you just have to assume diesel=biodiesel. All the others are clearly wrong.

For the impurity of copper question, how did you guys do it? I went mass change of pure copper/mass of copper lump
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thepikanation

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Re: Chemistry Examination Discussion
« Reply #143 on: November 12, 2013, 06:57:50 pm »
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Quote from: ch on November 12, 2013, 06:43:16 pm
For the renewable energy sources I don't get it doesnt each alternative have a non renwable a coal, b coal, c diesel ( as it does not specifty biodiesel and d crude oil?

Where it said diesel you had to assume that it was biodiesel, as it is a form of diesel, just like how there are renewable and non-renewable sources of methane (fracking vs. cows going poot :) )

Since all three fuel sources in that group had the ability to be renewable, that was the answer.
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Dayman

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Re: Chemistry Examination Discussion
« Reply #144 on: November 12, 2013, 06:57:58 pm »
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Quote from: nliu1995 on November 12, 2013, 06:56:50 pm
Yeah you just have to assume diesel=biodiesel. All the others are clearly wrong.

For the impurity of copper question, how did you guys do it? I went mass change of pure copper/mass of copper lump

Yeah and did you get 80.1%??? From memory that's what I got.
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presto

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Re: Chemistry Examination Discussion
« Reply #145 on: November 12, 2013, 06:59:39 pm »
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The link to the exam gives me an error (500) ??
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lzxnl

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Re: Chemistry Examination Discussion
« Reply #146 on: November 12, 2013, 07:01:26 pm »
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Quote from: Dayman on November 12, 2013, 06:57:58 pm
Yeah and did you get 80.1%??? From memory that's what I got.

Something like that yeah
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achre

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Re: Chemistry Examination Discussion
« Reply #147 on: November 12, 2013, 07:03:09 pm »
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Quote from: nliu1995 on November 12, 2013, 06:56:50 pm
Yeah you just have to assume diesel=biodiesel. All the others are clearly wrong.

For the impurity of copper question, how did you guys do it? I went mass change of pure copper/mass of copper lump
no god please no
that's what i did
and then i crossed it out
because it was worth 4 marks and i got that answer in one line
and then i just left it blank
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Dayman

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Re: Chemistry Examination Discussion
« Reply #148 on: November 12, 2013, 07:03:44 pm »
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Quote from: nliu1995 on November 12, 2013, 07:01:26 pm
Something like that yeah

It's seems too simple to be worth so many marks so I skipped it for a while.
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a-rod

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Re: Chemistry Examination Discussion
« Reply #149 on: November 12, 2013, 07:04:36 pm »
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Quote from: nliu1995 on November 12, 2013, 06:56:50 pm
Yeah you just have to assume diesel=biodiesel. All the others are clearly wrong.

For the impurity of copper question, how did you guys do it? I went mass change of pure copper/mass of copper lump

I calculated the mass change of pure copper/ mass change of copper lump, which gave me something like 87%. Other posts on this thread suggest I'm wrong, though.
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