Forensics C
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Forensics C
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-Nothing\'s gonna get deleted. We\'re gonna be like three little Fonzies here. And what\'s Fonzie like? Come on, what\'s Fonzie like?
-Cool?
-Correctamundo. And that\'s what we\'re gonna be. We\'re gonna be cool. Now, I\'m gonna count to three, and when I count three, you let go of your mouse, and back away from the keyboard. But when you do it, you do it cool. Ready? One... two... three.
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Re: Forensics C
How do you figure out Mass Spectra? I've tried to search it up on google but nothing comes up. I am hopelessly confused.
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Forensics, Thermodynamics, Fermi Questions
Forensics, Thermodynamics, Fermi Questions
- computergeek3
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Re: Forensics C
As are the rest of us. What I gather from reading in an AP Chem book is that if you're analyzing ONE element, the highest peak will be the most abundant isotope.smartgirl12 wrote:How do you figure out Mass Spectra? I've tried to search it up on google but nothing comes up. I am hopelessly confused.
http://www.chemguide.co.uk/analysis/mas ... ments.html is a good website
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Bayard Rustin Science Olympiad 2010-2014
Pittsburgh Allderdice Assistant Coach
Bayard Rustin Science Olympiad 2010-2014
Pittsburgh Allderdice Assistant Coach
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Re: Forensics C
Does anyone have any suggestions for how to study for this event first time? I competed last year as a freshman, placed 6th in astronomy/astrophysics and 10th in dynamic planet, both with my scheduled partner missing and a very unhelpful fill-in in his place.
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Re: Forensics C
I actually asked that question last year, since our team had struggled in Forensics in the past. It was pretty helpful as a starting point, even though I only competed in Forensics once personally. Here's what he said:
salcedam wrote:What I would recommend is starting right off the bat with learning how to identify the powders since that's a major chunk of the test and subsequently, one of the more important parts of it. For powders, you should have some sort of flowchart in place so as you can sequentially go through different tests (such as solubility, flame colors, HCl reactions, etc.) until you can identify it. For example, to identify boric acid, the only test you need to do for that is to do a flame test because boric acid makes a green flame. LiCl gives off a red flame and KCl gives off a purple flame. Those are the only three powders that will give those distinctive colors. The others will either give you a yellow, orange-ish, or no flame color at all. That's when you need to continue with the next step which would be to determine solubility and so on and so forth.
Then once you have powders down or at least have an idea of how to do them, move to the fibers and plastics and learning to identify those using burn tests (for the fibers in particular since they usually won't allow burn tests for plastics). For plastics, you identify them using densities so you need a flowchart just like for the powders of what to do when one plastic sinks in one solution. So let's say you have a plastic that sinks in water. You know that it must have a higher density so then you test the density using salt water. Different competitions will give different concentrations so you should know the densities of the various concentrations of salt water so that when they give you, let's say, a 10% salt solution and it sinks, you know that it must have a density higher than 1.074 g/mL since that's the density of a 10% salt solution. Then you should test the plastic using corn syrup or some high density liquid to see if it floats or sinks. If it sinks in corn syrup, it has to be PVC (according to the flowchart I've made) and if it floats, it's PETE.
So basically, you need to research flowcharts on powders and plastics as well as learn specific characteristics of fibers such as how they react when burned and how they look. From powders, fibers, and plastics, you move on to everything else. I'd focus less on glass and dirt/tire tracks and such since that's mostly matching. Most tests that I've come across focus mainly on blood, fingerprints, reading mass spec, and the occasional entomology question. When studying those things, you don't need to get too in-depth, but you should go past the surface a little bit. I've had tests where they ask how fingerprints are formed, how many ridges a fingerprint has, things besides matching and identifying fingerprint types. Hope that helps somewhat!
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So long, and thanks for all the Future Dictator titles!
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Re: Forensics C
Where are you guys getting your materials from. Did you ask your high school chem teachers or did you go out of your way to buy them from the two kits they are selling or are you just asking your high school teachers for the materials and then scavenging the rest from various places. If so, where are you getting your polymers from?
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