Forensics C

Test your knowledge of various Science Olympiad events.
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pikachu4919
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Re: Forensics C

Postby pikachu4919 » September 29th, 2015, 7:35 pm

Also, it appears that daydreamer0023 has not been on the forums in the past 2 weeks or so, so here's the next question (and not nearly as deadly): What are the medullary indices of human, horse, dog, and cat hair?
human: ~0.1 - 0.25
horse: ~0.6 - 0.75
dog: ~0.5 - 0.6
cat: ~0.7 - 0.9
All depends on location of the hair on the specimen
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Nationals 2016 ~ 4th place Forensics


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pikachu4919
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Re: Forensics C

Postby pikachu4919 » October 19th, 2015, 5:59 pm

SINCE NO ONE HAS POSTED A QUESTION,

You test an unknown powder. It doesn't dissolve in water. What test would you perform next on this unknown powder in your quest to determine what it is and why?
Carmel HS (IN) '16
Purdue BiolE '20
Nationals 2016 ~ 4th place Forensics


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MY CABBAGES!

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Magikarpmaster629
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Re: Forensics C

Postby Magikarpmaster629 » October 19th, 2015, 6:47 pm

SINCE NO ONE HAS POSTED A QUESTION,

You test an unknown powder. It doesn't dissolve in water. What test would you perform next on this unknown powder in your quest to determine what it is and why?
If it is not soluble, then it could be CaSO4, CaCO3, Cornstarch, or MgSO3. These all have different pH (except for CaSO4 and cornstarch), so doing a pH test would almost certainly yield the answer.
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pikachu4919
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Re: Forensics C

Postby pikachu4919 » October 20th, 2015, 10:55 am

SINCE NO ONE HAS POSTED A QUESTION,

You test an unknown powder. It doesn't dissolve in water. What test would you perform next on this unknown powder in your quest to determine what it is and why?
If it is not soluble, then it could be CaSO4, CaCO3, Cornstarch, or MgSO3. These all have different pH (except for CaSO4 and cornstarch), so doing a pH test would almost certainly yield the answer.
Nice job! Your turn!
Carmel HS (IN) '16
Purdue BiolE '20
Nationals 2016 ~ 4th place Forensics


Not throwin' away my shot!
MY CABBAGES!

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justgreene
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Re: Forensics C

Postby justgreene » November 1st, 2015, 3:52 pm

Since no one has posted a question, I'll do the honors. Describe the process of mass spectrometry - be sure to include how the different ions are measured and how those measurements are read. Good luck!


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