Forensics C
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Re: Forensics C
I'm not sure if this has been discussed at all on previous pages, but can anybody explain to me, or perhaps direct me in the right direction to find quality information about entomology involved in forensics as well as stages of death? Thanks.
- pikachu4919
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Re: Forensics C
10% - 1.07 g/cm^318alia wrote:Does anyone have the density values for different NaCl solutions? The only one I could find was 10%, and according to the wiki, 25% and saturated are often available for density tests.
25% - 1.19 g/cm^3
saturated - 1.25 g/cm^3
**disclaimer: only if they're made correctly**
Screw sig figs this time despite that chem cares about them
Look for peaks at molar masses of known important components of certain components that substances can separate into when shot through the mass spectrometer (i.e. water, methane, benzene (?), etc)Lumitailz wrote:Does anyone have any idea how to identify a substance given a random mass spec graph? There are just so many possibilities and I am stumped.
Ento in Forensics is mainly used to determine the amount of time that has elapsed between the death of the body and when it was found, which is then calculated via knowledge of the life cycle of the insect that was found on the body. As for stages of death, AsapSCIENCE explains it pretty well here: https://www.youtube.com/watch?v=55j-nVwHa_c19sawickin wrote:I'm not sure if this has been discussed at all on previous pages, but can anybody explain to me, or perhaps direct me in the right direction to find quality information about entomology involved in forensics as well as stages of death? Thanks.
Carmel HS (IN) '16
Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
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- daydreamer0023
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Re: Forensics C
Okay, sketchy stupid question here, do you know if bacterial inoculation loops can be cleaned safely with HCl to prevent sodium contamination without corroding the wire? We're probably going to use them for competition... :/
"I am among those who think that science has great beauty. A scientist in his laboratory is not only a technician: he is also a child placed before natural phenomena which impress him like a fairy tale." - Marie Curie
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- raxu
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Re: Forensics C
Hello!
Our team don't have access to access to the fibers... What does "shrivels" look like?
Thanks!
raxu
Our team don't have access to access to the fibers... What does "shrivels" look like?
Thanks!
raxu
Richard
Events done Div. B: Simple Machines , Shock Value.
Events done Div. C: Astronomy , It's About Time, Forensics, Optics, Remote Sensing, Game On, Materials Science, Mousetrap Vehicle, Fermi Questions, Thermodynamics.
Events done Div. B: Simple Machines , Shock Value.
Events done Div. C: Astronomy , It's About Time, Forensics, Optics, Remote Sensing, Game On, Materials Science, Mousetrap Vehicle, Fermi Questions, Thermodynamics.
- pikachu4919
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Re: Forensics C
Depends on what metal it's made of. If it's made of zinc, then definitely not safe since it'll basically dissolve right away and release flammable hydrogen gas.daydreamer0023 wrote:Okay, sketchy stupid question here, do you know if bacterial inoculation loops can be cleaned safely with HCl to prevent sodium contamination without corroding the wire? We're probably going to use them for competition... :/
This is for animal fibers right? It turns dark brownish-blackish and shrinksraxu wrote:Hello!
Our team don't have access to access to the fibers... What does "shrivels" look like?
Thanks!
raxu
Carmel HS (IN) '16
Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
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Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
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Re: Forensics C
You can head to a hobby lobby or Michaels and tell them about science Olympiad and usually they can get you what you need from scraps laying around in about 10 minutes.raxu wrote:Hello!
Our team don't have access to access to the fibers... What does "shrivels" look like?
Thanks!
raxu
- pikachu4919
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Re: Forensics C
Lol yeah that's what I did too! Another thing - if you do that, be sure they give you fabrics that are 100% of the fiber you're looking for, not a mixture of fibers (except for spandex in which you don't really have a choice)RJohnson wrote:You can head to a hobby lobby or Michaels and tell them about science Olympiad and usually they can get you what you need from scraps laying around in about 10 minutes.raxu wrote:Hello!
Our team don't have access to access to the fibers... What does "shrivels" look like?
Thanks!
raxu
Carmel HS (IN) '16
Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
About me || Rate my tests!
Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.
MY CABBAGES!
Purdue BioE '21? reevaluating my life choices
Nationals 2016 ~ 4th place Forensics
"It is important to draw wisdom from different places. If you take it from only one place, it becomes rigid and stale." -Uncle Iroh
About me || Rate my tests!
Opinions expressed on this site are not official; the only place for official rules changes and FAQs is soinc.org.
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- Magikarpmaster629
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Re: Forensics C
I'm having trouble with two things.
First is solubility- sometimes I mess up and I get a soluble powder like calcium nitrate to appear as if it couldn't dissolve, at least at first. Is there a good way to ensure I got consistent results while dissolving powders quickly (since time is so important in this event)? Should I stir or no?
The other problem is that at least when I look at hairs under a microscope I can never see the shape of the hair, just a black strip, which makes them all look the same. Am I just using low quality microscopes? Should I try changing the height of the slide? Or am I just bad at seeing?
First is solubility- sometimes I mess up and I get a soluble powder like calcium nitrate to appear as if it couldn't dissolve, at least at first. Is there a good way to ensure I got consistent results while dissolving powders quickly (since time is so important in this event)? Should I stir or no?
The other problem is that at least when I look at hairs under a microscope I can never see the shape of the hair, just a black strip, which makes them all look the same. Am I just using low quality microscopes? Should I try changing the height of the slide? Or am I just bad at seeing?
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A wild goose flies over a pond, leaving behind a voice in the wind.
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A wild goose flies over a pond, leaving behind a voice in the wind.
A man passes through this world, leaving behind a name.
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Re: Forensics C
Okay, for hairs are you allowed a microscope at the competitions?
At MIT, we had to identify by feel, touch, and taste if you yolo-ed---no microscopes were provided.
At MIT, we had to identify by feel, touch, and taste if you yolo-ed---no microscopes were provided.
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National Medals: 2017 Forensics 2nd, ...
National Medals: 2017 Forensics 2nd, ...
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