Forensics C

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yellow_squirtle
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Re: Forensics C

Postby yellow_squirtle » December 25th, 2016, 9:11 pm

What are the burn test results for polystyrene?
-
yellow flame, burns quickly, plastic drips, gas odor, black smoke with soot

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sciduck
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Re: Forensics C

Postby sciduck » December 26th, 2016, 1:30 pm

What are the burn test results for polystyrene?
-
yellow flame, burns quickly, plastic drips, gas odor, black smoke with soot
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yellow_squirtle
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Re: Forensics C

Postby yellow_squirtle » December 30th, 2016, 12:51 am

Why is acetone a good solvent to use for paper chromatography on permanent markers?

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sciduck
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Re: Forensics C

Postby sciduck » December 30th, 2016, 9:55 pm

Why is acetone a good solvent to use for paper chromatography on permanent markers?
.
Acetone is nonpolar. Permanent markers use nonpolar ink (so water won't wash it away). Like dissolves like, so the acetone can actually move the permanent marker ink up the paper.
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yellow_squirtle
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Re: Forensics C

Postby yellow_squirtle » January 2nd, 2017, 11:04 pm

Why is acetone a good solvent to use for paper chromatography on permanent markers?
.
Acetone is nonpolar. Permanent markers use nonpolar ink (so water won't wash it away). Like dissolves like, so the acetone can actually move the permanent marker ink up the paper.
Correct
I believe acetone is polar, but it shares both polar and nonpolar properties. Please correct me if I am wrong. Regardless, your turn :--)

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sciduck
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Re: Forensics C

Postby sciduck » January 6th, 2017, 7:26 pm

Correct
I believe acetone is polar, but it shares both polar and nonpolar properties. Please correct me if I am wrong. Regardless, your turn :--)
I think you are right
I just guessed because it worked w/ permanent markers but acetone actually has oxygen in it so, yeah I guess it would be polar
What type of fingerprint has 3 deltas?
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Re: Forensics C

Postby Lumitailz » January 6th, 2017, 8:20 pm

What type of fingerprint has 3 deltas?
I believe
Accidental whorls have more than 2 deltas

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Re: Forensics C

Postby sciduck » January 13th, 2017, 11:32 am

What type of fingerprint has 3 deltas?
I believe
Accidental whorls have more than 2 deltas
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Re: Forensics C

Postby Lumitailz » January 14th, 2017, 4:11 pm

Stationary phase for TLC and gas chromatography?

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Re: Forensics C

Postby sciduck » January 15th, 2017, 8:04 am

Stationary phase for TLC and gas chromatography?
Stationary phase
TLC: Adsorbent (on flat glass / plastic plate) Gas chromatography: thin layer of an liquid on an inert solid support
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Re: Forensics C

Postby Lumitailz » January 15th, 2017, 9:44 am

Stationary phase
TLC: Adsorbent (on flat glass / plastic plate) Gas chromatography: thin layer of an liquid on an inert solid support
Yup, your turn.

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Re: Forensics C

Postby sciduck » January 16th, 2017, 7:35 am

What does ninhydrin react with to form fingerprints?
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Re: Forensics C

Postby Lumitailz » January 16th, 2017, 8:43 am

What does ninhydrin react with to form fingerprints?
Ninhydrin
amino acids

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sciduck
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Re: Forensics C

Postby sciduck » January 16th, 2017, 2:33 pm

What does ninhydrin react with to form fingerprints?
Ninhydrin
amino acids
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Re: Forensics C

Postby Lumitailz » January 17th, 2017, 5:43 pm

When do fingerprints first form? and
Where do they originate?


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