Forensics C

LostInTheSauce
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Re: Forensics C

Postby LostInTheSauce » December 17th, 2018, 9:18 am

Qu€€nMon€y wrote:I'm determined to medal in Forensics but I need help in powder and fiber identification. I have a chart on it in my cheat sheet but I want to know the process that makes the identification fast.


If u have a chart to identify everything, then the best way to learn how to quickly ID everything is through practice.

scienceisfunalil
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Re: Forensics C

Postby scienceisfunalil » January 15th, 2019, 11:19 am

Hi! Is it just me or does powders take a long time to do? Every competition I do not finish and my partner has to do polymers, chroma, mass spec, and physical evidence themselves. Is there something I’m doing wrong? Also test tube cleaning in between powders takes a long time? And sometimes I even run out ot powders. Is this normal? Thanks
Forensics // Sounds of Music // Fossils

C8H10N4O2!
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Re: Forensics C

Postby C8H10N4O2! » January 15th, 2019, 2:29 pm

scienceisfunalil wrote:Hi! Is it just me or does powders take a long time to do? Every competition I do not finish and my partner has to do polymers, chroma, mass spec, and physical evidence themselves. Is there something I’m doing wrong? Also test tube cleaning in between powders takes a long time? And sometimes I even run out ot powders. Is this normal? Thanks

Try well plates... this will limit true cleanup in between, and help you keep track of the powders easily. Also, depending on the type of person you are, either work only with one powder at a time, or do one test at a time. I prefer working with about 3 powders at a time, just to keep me from getting too confused. I only use test tubes for benedicts.

scienceisfunalil
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Re: Forensics C

Postby scienceisfunalil » January 15th, 2019, 3:32 pm

C8H10N4O2! wrote:
scienceisfunalil wrote:Hi! Is it just me or does powders take a long time to do? Every competition I do not finish and my partner has to do polymers, chroma, mass spec, and physical evidence themselves. Is there something I’m doing wrong? Also test tube cleaning in between powders takes a long time? And sometimes I even run out ot powders. Is this normal? Thanks

Try well plates... this will limit true cleanup in between, and help you keep track of the powders easily. Also, depending on the type of person you are, either work only with one powder at a time, or do one test at a time. I prefer working with about 3 powders at a time, just to keep me from getting too confused. I only use test tubes for benedicts.



ahh thank you. so how do you keep track of which powders are in which wells? And how do you clean the wells?
Forensics // Sounds of Music // Fossils

will926ok3645
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Re: Forensics C

Postby will926ok3645 » January 15th, 2019, 5:04 pm

scienceisfunalil wrote:
C8H10N4O2! wrote:
scienceisfunalil wrote:Hi! Is it just me or does powders take a long time to do? Every competition I do not finish and my partner has to do polymers, chroma, mass spec, and physical evidence themselves. Is there something I’m doing wrong? Also test tube cleaning in between powders takes a long time? And sometimes I even run out ot powders. Is this normal? Thanks

Try well plates... this will limit true cleanup in between, and help you keep track of the powders easily. Also, depending on the type of person you are, either work only with one powder at a time, or do one test at a time. I prefer working with about 3 powders at a time, just to keep me from getting too confused. I only use test tubes for benedicts.



ahh thank you. so how do you keep track of which powders are in which wells? And how do you clean the wells?

You can mark the top of the well plate with a sharpie. You can also label each well plate with a number or letter, and some well plates are labeled. I saw some teams using them at MIT and it seemed that it was not an issue for those teams. And simply water should work for cleaning. Hope that helps!
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MIT/SOUP/Regionals/States
Water Quality: 2/7(ouch)/1/-
Picture This: 3/X/X/X
Forensics: 15/4/2/-/
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nishkajakkidi
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Re: Forensics C

Postby nishkajakkidi » January 15th, 2019, 8:35 pm

Hello,
For the forensic event, do we need to bring our own materials that are listed on the recommended lab equipment list?

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Re: Forensics C

Postby pikachu4919 » January 15th, 2019, 8:48 pm

nishkajakkidi wrote:Hello,
For the forensic event, do we need to bring our own materials that are listed on the recommended lab equipment list?


That is correct. The supervisor sure isn’t obligated to provide the stuff on that list for ya.
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scienceisfunalil
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Re: Forensics C

Postby scienceisfunalil » January 18th, 2019, 7:25 am

Hello again! So I’m doint research into ammonium chloride, and it says that ammonium chloride polymerizes when put in the flame. What does this mean? Thanks
Forensics // Sounds of Music // Fossils

scienceisfunalil
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Re: Forensics C

Postby scienceisfunalil » January 22nd, 2019, 6:26 am

Hey again! I’m trying to find where I can buy plastics to practice with? I tried clicking the link to eezway but it didn’t lead anywhere. If you could point me in the direction or tell me what I should be looking for that would be very helpful. Thanks!
Forensics // Sounds of Music // Fossils

endoplasmic
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Re: Forensics C

Postby endoplasmic » January 23rd, 2019, 1:04 pm

I’m trying to get better at the essay portion of Forensics, but from the last few competitions what I’ve noticed is how do even get points for writing the evidence if we analyzed the evidence wrong? It seems to me that identifying a substance wrong for example, would hurt you twice. Anyone have any tips on how to improve this section or have a rubric?

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Re: Forensics C

Postby C8H10N4O2! » January 26th, 2019, 5:34 pm

Anyone have any tips for how to differentiate from Sodium Acetate and Sodium Chloride?

I start with a flame test then test HCl for carbonate. After this, how can I reliably tell these two apart? I know NaOH is a possibility (NaCl dissolves slowly?), but I want something that isn't completely subjective....

LostInTheSauce
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Re: Forensics C

Postby LostInTheSauce » January 29th, 2019, 6:36 am

C8H10N4O2! wrote:Anyone have any tips for how to differentiate from Sodium Acetate and Sodium Chloride?

I start with a flame test then test HCl for carbonate. After this, how can I reliably tell these two apart? I know NaOH is a possibility (NaCl dissolves slowly?), but I want something that isn't completely subjective....


Try testing pH.

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Re: Forensics C

Postby random-username » January 31st, 2019, 6:44 pm

Any tips for differentiating horse and cow hair? They look the same to me under a microscope... both appear to have thick and black medulla.

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Re: Forensics C

Postby fastllama » February 1st, 2019, 3:06 pm

random-username wrote:Any tips for differentiating horse and cow hair? They look the same to me under a microscope... both appear to have thick and black medulla.


I think horse hair generally has a thicker medulla and cattle hair has ovoid bodies

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Re: Forensics C

Postby c21k » February 3rd, 2019, 11:03 am

Does anyone have some advice on how to identify a given plastic sample?

(no burn tests permitted, no solutions of different densities or indices provided)
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Fossils, Sounds, 4N6, MP, Mouse
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