Forensics C

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Re: Forensics C

Postby EastStroudsburg13 » January 4th, 2018, 6:48 am

pikachu4919 wrote:
depo1213 wrote:
pikachu4919 wrote:
What do you mean by appendices?


I mean like where they refer to an apendix in a question and then you have to go into the back of the book to look for Appendix A or B.

For example the questions could be like determine the fibers. Fibers can be found in Appendix A. So you have to go to the back of the booklet for find it.


Huh, I've never taken a test that has done that...

I've taken Astro tests that do that. It can be a little disorienting, but if the test proctor allows you to detach pages from the booklet, I'd definitely recommend you do that. It's a good general science skill to be able to get data from an external reference and use it to answer a question.
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Re: Forensics C

Postby pikachu4919 » January 8th, 2018, 8:17 pm

WhatScience? wrote:Why would you even want to touch the dead body of an animal?


Because examining deaths are a thing in forensics, in both the SciOly event and real life. :P

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Re: Forensics C

Postby Stefannli » January 9th, 2018, 7:54 am

Can anyone please explain HOW to determine the molecular formula of this mass spec? Thanks! Image

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Re: Forensics C

Postby d4dd7y00n » January 11th, 2018, 5:18 am

Stefannli wrote:Can anyone please explain HOW to determine the molecular formula of this mass spec? Thanks! Image


The peak on the rightmost side is tells you the molar mass of the molecular formula. You see that the rightmost peak is around m/e of ~46, which corresponds to the molar mass of the ethanol

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Re: Forensics C

Postby Stefannli » January 11th, 2018, 12:36 pm

d4dd7y00n wrote:
Stefannli wrote:Can anyone please explain HOW to determine the molecular formula of this mass spec? Thanks! Image


The peak on the rightmost side is tells you the molar mass of the molecular formula. You see that the rightmost peak is around m/e of ~46, which corresponds to the molar mass of the ethanol




I was asking for the molecular formula, not the molar mass. Sorry for any confusion.

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Re: Forensics C

Postby Magikarpmaster629 » January 13th, 2018, 5:22 am

Stefannli wrote:
d4dd7y00n wrote:
Stefannli wrote:Can anyone please explain HOW to determine the molecular formula of this mass spec? Thanks!


The peak on the rightmost side is tells you the molar mass of the molecular formula. You see that the rightmost peak is around m/e of ~46, which corresponds to the molar mass of the ethanol

I was asking for the molecular formula, not the molar mass. Sorry for any confusion.

Usually the molecules used for these are taken from a list of carbohydrates; find a list for this and match the molecular weight to the carbohydrate.
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Re: Forensics C

Postby Panda Weasley » January 18th, 2018, 6:38 pm

Have yall ever had to determine the direction of impact for glass?
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Re: Forensics C

Postby Stefannli » January 20th, 2018, 7:06 am

Are Bunsen burners and hot water baths usually provided in invitational competitions such as Princeton?

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Re: Forensics C

Postby pikachu4919 » January 20th, 2018, 8:48 pm

Stefannli wrote:Are Bunsen burners and hot water baths usually provided in invitational competitions such as Princeton?


They should be. That's on the event supervisor.

Panda Weasley wrote:Have yall ever had to determine the direction of impact for glass?


I've personally never seen it on any tests I've taken, nor have I used it yet on tests that I've written. I think the reason why would be that maybe supervisors don't wanna write a problem for it or a lot of the images may not be able to show much detail of the impact spot beyond the spot where it hit and the resulting cracks surrounding it.

Thanks for the idea tho, I’ll consider it for the future :twisted:

Magikarpmaster629 wrote:
Stefannli wrote:
d4dd7y00n wrote:
The peak on the rightmost side is tells you the molar mass of the molecular formula. You see that the rightmost peak is around m/e of ~46, which corresponds to the molar mass of the ethanol

I was asking for the molecular formula, not the molar mass. Sorry for any confusion.

Usually the molecules used for these are taken from a list of carbohydrates; find a list for this and match the molecular weight to the carbohydrate.


In reality it's waaaaaayyyy more complicated than that. It's quite an advanced organic chemistry topic, actually. Those textbooks may have some info on that.
Last edited by pikachu4919 on January 21st, 2018, 8:06 pm, edited 1 time in total.
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Re: Forensics C

Postby windu34 » January 20th, 2018, 10:11 pm

pikachu4919 wrote:
Stefannli wrote:Are Bunsen burners and hot water baths usually provided in invitational competitions such as Princeton?


They should be. That's on the event supervisor.

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Re: Forensics C

Postby AMAZHANG » January 21st, 2018, 4:21 pm

At a tournament, if I am given hair samples in a bag, not in a microscope slide, how should I go about trying to figure out what it is?
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Re: Forensics C

Postby pikachu4919 » January 21st, 2018, 7:40 pm

AMAZHANG wrote:At a tournament, if I am given hair samples in a bag, not in a microscope slide, how should I go about trying to figure out what it is?


The rules allow competitors to bring microscope slides and cover slips, which mostly indicates that the competitors technically should be making their own slides at competition with the hairs provided (unless given microscope images which is 1000x less fun than actually trying to ID it :P )
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Re: Forensics C

Postby AMAZHANG » January 21st, 2018, 8:56 pm

pikachu4919 wrote:
AMAZHANG wrote:At a tournament, if I am given hair samples in a bag, not in a microscope slide, how should I go about trying to figure out what it is?


The rules allow competitors to bring microscope slides and cover slips, which mostly indicates that the competitors technically should be making their own slides at competition with the hairs provided (unless given microscope images which is 1000x less fun than actually trying to ID it :P )


Ohhh, I see. I was leaning towards that option but since I have to do the analysis, polymers, etc.. I was wondering if there was a quicker way. I guess not lol, thanks so much!
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Re: Forensics C

Postby pikachu4919 » January 21st, 2018, 9:17 pm

AMAZHANG wrote:
pikachu4919 wrote:
AMAZHANG wrote:At a tournament, if I am given hair samples in a bag, not in a microscope slide, how should I go about trying to figure out what it is?


The rules allow competitors to bring microscope slides and cover slips, which mostly indicates that the competitors technically should be making their own slides at competition with the hairs provided (unless given microscope images which is 1000x less fun than actually trying to ID it :P )


Ohhh, I see. I was leaning towards that option but since I have to do the analysis, polymers, etc.. I was wondering if there was a quicker way. I guess not lol, thanks so much!


I remember when I competed, by the time I was reaching my third/fourth year competing in forensics, I just accepted that most microscopes are not going to be top-notch and started relying on gut intuition to guess the hairs based on what I knew about the characteristics of the animal :P it’s a time saver for sure, especially when some other sections are worth more points that you could get more easily
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Re: Forensics C

Postby alylam » January 22nd, 2018, 8:56 am

This is a little off topic from the discussion above, but does anyone know where invites get the samples they use in the plastics/polymers section? Like specifically the pellets/beads? We've been trying to look for them for forever lol
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