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November 08, 2025, 04:20:18 pm
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Author Topic: Exam Predictions/Questions  (Read 1931 times)  Share 

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hyperblade01

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Exam Predictions/Questions
« on: June 09, 2009, 07:14:33 pm »
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I tend to look at past exams and take a guess on what's going to be on this one...

Earlier this year my teacher told me biofuels was done poorly so possibily examiners will put a question in there.


So there's ethanol, biodiesel and biogas.

Thinking it'll be biodiesel and maybe the process on how its made:

Tryglyceride + Methanol + KOH - Tryglyceride hydrolysed to give
Fatty Acid + Glycerol which react with Methanol to give
Ester + Water

Think it could get harder than that?
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d0minicz

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Re: Exam Predictions/Questions
« Reply #1 on: June 09, 2009, 07:16:22 pm »
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can that be shown in 1 step?
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arthurk

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Re: Exam Predictions/Questions
« Reply #2 on: June 09, 2009, 07:17:42 pm »
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maybe a question on why biofuel is preferred blah blah
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hyperblade01

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Re: Exam Predictions/Questions
« Reply #3 on: June 09, 2009, 07:28:05 pm »
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Quote from: d0minicz on June 09, 2009, 07:16:22 pm
can that be shown in 1 step?


I don't think so because between the 3 steps not everything is used..


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Dark Horse

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Re: Exam Predictions/Questions
« Reply #4 on: June 09, 2009, 08:07:44 pm »
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It can be, as it is a transesterification reaction. You write the triglyceride + methanol in the presence of NaOH or KOH to produce a methyl ester (biodiesel) and glycerol
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hyperblade01

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Re: Exam Predictions/Questions
« Reply #5 on: June 09, 2009, 08:13:06 pm »
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Heh, we'll just have to see


Looks like last year didnt have a DNA short answer as well - maybe draw the structure of a nucleotide (like bio :P) and a crime scene scenario :O

DNA sample > PCR > Restriction Enyzme > Electrophoresis > Match to other samples or not and why

Hope I got the process in the right order
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Dark Horse

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Re: Exam Predictions/Questions
« Reply #6 on: June 09, 2009, 08:15:34 pm »
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Yep, after electrophoresis, the bands are subjected to radioactive probes. Why?
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hyperblade01

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Re: Exam Predictions/Questions
« Reply #7 on: June 09, 2009, 08:18:13 pm »
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Radiation used to make them visible? Or was that with dye and UV light to fluoresce it...

Or both... >.>
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IntoTheNewWorld

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Re: Exam Predictions/Questions
« Reply #8 on: June 09, 2009, 08:22:25 pm »
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Quote from: hyperblade01 on June 09, 2009, 08:18:13 pm
Radiation used to make them visible? Or was that with dye and UV light to fluoresce it...

Or both... >.>

I think both do the same thing, you do one or the other.

I think
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mystikal

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Re: Exam Predictions/Questions
« Reply #9 on: June 09, 2009, 08:22:51 pm »
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do you have to put 3 methanol and 3 fatty acids in the equations for transesterification?

or  just CH3OH + COOH-R ->CH3COO-R +h20
« Last Edit: June 09, 2009, 08:32:17 pm by mystikal »
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d0minicz

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Re: Exam Predictions/Questions
« Reply #10 on: June 09, 2009, 08:43:49 pm »
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sooo they stain the electrophoresis with a radioactive dye and apply UV right ???
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arthurk

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Re: Exam Predictions/Questions
« Reply #11 on: June 09, 2009, 08:51:27 pm »
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draw structure of nucleotide i think going to be on it
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