Forensics C

[AzureWotan]

All right.
Is there a list of fibers and plastics so I dont add absolutly every fiber, plastic, and poweder to my flow chart?

[personasaurus rex]

All right.
Is there a list of fibers and plastics so I dont add absolutly every fiber, plastic, and poweder to my flow chart?

they're all on that rules sheet

[cpeters24]

Hey! I have an invitational this Saturday, and my partner and I were double checking the rules. We did not know anything about the cobalt blue glass under flame test equipment that teams are supposed to bring. We have some, but we do not know what it's used for. Can someone help me out with this?

Hey, are you going to Loyola?

And you hold up the cobalt blue glass next to the flame in order to absorb the yellow color of that the sodium ion gives off so as to see if it really is sodium or if sodium is just contaminating the sample you're burning.

No, I went to the Thornapple-Kellogg invite. I didn't use the cobalt blue glass this time, but thanks for the help! I ended up doing well anyway without it.

[jkting3]

So most tests so far I've seen provide 46% IPA, Vegetable oil, Distilled water, 10% NaCl, and Saturated NaCl. Saturated NaCl solutions I think are around 26.8% NaCl. This won't be able to separate PC and PMMA by density, so is there any advice on how I should do this? I mean, if they give me a 25% NaCl solution I should be set, but so far I haven't come across a test that has provided one to me. Thanks in advance!

[personasaurus rex]

So most tests so far I've seen provide 46% IPA, Vegetable oil, Distilled water, 10% NaCl, and Saturated NaCl. Saturated NaCl solutions I think are around 26.8% NaCl. This won't be able to separate PC and PMMA by density, so is there any advice on how I should do this? I mean, if they give me a 25% NaCl solution I should be set, but so far I haven't come across a test that has provided one to me. Thanks in advance!

At that point, pray that the test writer was nice and gave you some burn test information.

[salcedam]

So most tests so far I've seen provide 46% IPA, Vegetable oil, Distilled water, 10% NaCl, and Saturated NaCl. Saturated NaCl solutions I think are around 26.8% NaCl. This won't be able to separate PC and PMMA by density, so is there any advice on how I should do this? I mean, if they give me a 25% NaCl solution I should be set, but so far I haven't come across a test that has provided one to me. Thanks in advance!

At that point, pray that the test writer was nice and gave you some burn test information.

Basically, if the test writers decide to do that...yeah. Hope they give you more information than that. I hate that those two plastics are so close in densities...~_~

[NinjaChicken]

For the first invitational that I went to, the ES accepted both plastics because he didn't give any further information.

[AzureWotan]

Probly off-topic of what you guys are talking about,
But I found a really helpful link with a flow chart, it doesnt have everything but it has a lot.
http://www.sciencegeek.net/Chemistry/ch ... alysis.pdf

[Phenylethylamine]

Probly off-topic of what you guys are talking about,
But I found a really helpful link with a flow chart, it doesnt have everything but it has a lot.
http://www.sciencegeek.net/Chemistry/ch ... alysis.pdf

Yes, I strongly recommend having a flow chart (like this one, but with all the powders) on your notes sheet. It's vastly easier to deal with in competition than a table of information.

[soccer_5456]

Hey guys, at our regionals they additionally gave us Silver Nitrate without any explanation. I initially thought about solubility of Ag with sulfates, but the unknowns that precipitated with AgNO3 didn't precipitate with NaOH, making everything kind of confusing. Could anyone tell me what AgNO3 would clearly identify in conjunction with any other of the reagents?