Forensics C

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EastStroudsburg13
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Re: Forensics C

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


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

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

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

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

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

Are Bunsen burners and hot water baths usually provided in invitational competitions such as Princeton?
They should be. That's on the event supervisor.
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:

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

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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