Forensics C

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Magikarpmaster629
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Re: Forensics C

Postby Magikarpmaster629 » September 5th, 2015, 4:54 pm

Correct!
Bleh, you or someone else can go; I'm not good enough at forensics yet to ask good questions.
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Re: Forensics C

Postby daydreamer0023 » September 7th, 2015, 4:01 pm

Correct!
Bleh, you or someone else can go; I'm not good enough at forensics yet to ask good questions.
Just showed up fresh out of Division B. :P Hope I can come up with something relevant. Which powders will react with HCl? With NaOH? With Benedict's solution? For the last question, describe the physical reaction of the powders that react with Benedict's solution.
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Re: Forensics C

Postby samlan16 » September 7th, 2015, 11:32 pm

Correct!
Bleh, you or someone else can go; I'm not good enough at forensics yet to ask good questions.
Just showed up fresh out of Division B. :P Hope I can come up with something relevant. Which powders will react with HCl? With NaOH? With Benedict's solution? For the last question, describe the physical reaction of the powders that react with Benedict's solution.
Everyone, give me a day. I need to practically write an essay for this.
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Magikarpmaster629
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Re: Forensics C

Postby Magikarpmaster629 » September 24th, 2015, 4:27 pm


Just showed up fresh out of Division B. :P Hope I can come up with something relevant. Which powders will react with HCl? With NaOH? With Benedict's solution? For the last question, describe the physical reaction of the powders that react with Benedict's solution.
Everyone, give me a day. I need to practically write an essay for this.
You could just list the powders that react with benedict's; I'd like to get this question marathon going again.
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Re: Forensics C

Postby samlan16 » September 24th, 2015, 5:10 pm


Just showed up fresh out of Division B. :P Hope I can come up with something relevant. Which powders will react with HCl? With NaOH? With Benedict's solution? For the last question, describe the physical reaction of the powders that react with Benedict's solution.
Everyone, give me a day. I need to practically write an essay for this.
You could just list the powders that react with benedict's; I'd like to get this question marathon going again.
Yeah, that was sarcasm. Anyway,
[list]
[*]Glucose- after heating for ~5 minutes, Benedict's turns red orange due to the reduction of Cu ions, which are released from copper (II) sulfate.
[*]Sucrose- conditional of dissolving the crystals to break the bonds between each glucose and fructose, the solution turns slightly red orange. However, it does not exhibit the same color as the glucose rxn because a good majority of the disaccharides are not fully hydrolyzed.

Gee, I sound like a Food Science coach. XD[/list]
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?
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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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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?
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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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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!
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Nationals 2016 ~ 4th place Forensics


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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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