Forensics C

Locked
User avatar
Galahad
Member
Member
Posts: 293
Joined: January 22nd, 2018, 11:28 pm
Division: Grad
State: HI
Has thanked: 8 times
Been thanked: 23 times

Re: Forensics C

Post by Galahad »

SilverBreeze wrote: February 25th, 2020, 8:26 pm
Galahad wrote: February 25th, 2020, 6:01 pm
WangwithaTang wrote: February 17th, 2020, 9:51 pm
Usually, they will have burn test results to differentiate.
How can burning them differentiate them? I usually just go off of smell which can just identify plant or animal, but beyond that I'm not sure.
Look for flame color/behavior, smoke, residual bead, more specific smell, etc. Also check for pictures online.
Like specifically? I can't find out anywhere (or a consistent idea, at least) how to tell apart wool from silk or linen from cotton
Finally an alumnus!

Highlands Intermediate School '16-'19
Pearl City High School '19-'22
DMAH '18-'22
UC Irvine '26


https://scioly.org/wiki/index.php/User:Galahad
User avatar
CPScienceDude
Exalted Member
Exalted Member
Posts: 374
Joined: December 12th, 2018, 2:40 pm
Division: Grad
State: IN
Pronouns: He/Him/His
Has thanked: 144 times
Been thanked: 90 times

Re: Forensics C

Post by CPScienceDude »

Galahad wrote: February 27th, 2020, 4:38 pm
SilverBreeze wrote: February 25th, 2020, 8:26 pm
Galahad wrote: February 25th, 2020, 6:01 pm

How can burning them differentiate them? I usually just go off of smell which can just identify plant or animal, but beyond that I'm not sure.
Look for flame color/behavior, smoke, residual bead, more specific smell, etc. Also check for pictures online.
Like specifically? I can't find out anywhere (or a consistent idea, at least) how to tell apart wool from silk or linen from cotton
If you can, try and get a hold of the fibers and try the burn tests yourself. Alternatively, you can tell these fibers apart from looking at them under a microscope. Wool will have scale-like structures on it, silk is usually smooth. Linen usually has bumps, or kinks in it, while cotton looks like a spiral or helix. Here are some great resources. Look Here and Here
Crown Point HS '23
Purdue University '27

Assassinator 139 and 147

About Me!
Image
ckenn4189
Member
Member
Posts: 25
Joined: January 27th, 2020, 1:20 pm
Division: C
State: NC
Has thanked: 0
Been thanked: 0

Re: Forensics C

Post by ckenn4189 »

Can someone give me a list of all the powders in Benedict's solution?
sodium acetate:
sodium chloride:
sodium hydrogen carbonate:
sodium carbonate:
lithium chloride:
potassium chloride:
calcium nitrate:
calcium sulfate:
calcium carbonate:
cornstarch:
glucose:
sucrose:
magnesium sulfate:
boric acid:
ammonium chloride:
User avatar
CPScienceDude
Exalted Member
Exalted Member
Posts: 374
Joined: December 12th, 2018, 2:40 pm
Division: Grad
State: IN
Pronouns: He/Him/His
Has thanked: 144 times
Been thanked: 90 times

Re: Forensics C

Post by CPScienceDude »

ckenn4189 wrote: March 2nd, 2020, 10:03 am Can someone give me a list of all the powders in Benedict's solution?
sodium acetate:
sodium chloride:
sodium hydrogen carbonate:
sodium carbonate:
lithium chloride:
potassium chloride:
calcium nitrate:
calcium sulfate:
calcium carbonate:
cornstarch:
glucose:
sucrose:
magnesium sulfate:
boric acid:
ammonium chloride:
Look here
Crown Point HS '23
Purdue University '27

Assassinator 139 and 147

About Me!
Image
ckenn4189
Member
Member
Posts: 25
Joined: January 27th, 2020, 1:20 pm
Division: C
State: NC
Has thanked: 0
Been thanked: 0

Re: Forensics C

Post by ckenn4189 »

That helps a bunch, thanks! Also, what is the reaction of ascorbic acid (Vitamin C) with NaOH and HCl?
User avatar
SilverBreeze
Exalted Member
Exalted Member
Posts: 306
Joined: November 28th, 2019, 3:42 pm
Division: C
State: CA
Has thanked: 156 times
Been thanked: 289 times

Re: Forensics C

Post by SilverBreeze »

ckenn4189 wrote: March 2nd, 2020, 1:06 pm That helps a bunch, thanks! Also, what is the reaction of ascorbic acid (Vitamin C) with NaOH and HCl?
Vit C is not on the Forensics list. It is a division B powder for Crime Busters.
Troy SciOly 2019 - 2023
Captain 2021-2023
Former Events: Ecology, Water Quality, Green Gen, Ornithology, Forestry, Disease Detectives, Forensics, Chem Lab, Env Chem, Sounds, Dynamic Planet, Crime Busters, Potions & Poisons, Exp Design, Towers, Mystery Arch, Reach for the Stars, Mission Possible
ckenn4189
Member
Member
Posts: 25
Joined: January 27th, 2020, 1:20 pm
Division: C
State: NC
Has thanked: 0
Been thanked: 0

Re: Forensics C

Post by ckenn4189 »

SilverBreeze wrote: March 2nd, 2020, 4:32 pm
ckenn4189 wrote: March 2nd, 2020, 1:06 pm That helps a bunch, thanks! Also, what is the reaction of ascorbic acid (Vitamin C) with NaOH and HCl?
Vit C is not on the Forensics list. It is a division B powder for Crime Busters.
Yep, just noticed that...thanks!
WangwithaTang
Member
Member
Posts: 111
Joined: January 3rd, 2019, 8:48 pm
Has thanked: 5 times
Been thanked: 3 times

Re: Forensics C

Post by WangwithaTang »

How do you tell the difference between cow and horse hair? They look exactly the same.
mrsherwood18
Member
Member
Posts: 2
Joined: December 13th, 2019, 9:09 pm
State: WA
Has thanked: 0
Been thanked: 0

Re: Forensics C

Post by mrsherwood18 »

WangwithaTang wrote: March 3rd, 2020, 4:00 pm How do you tell the difference between cow and horse hair? They look exactly the same.
Cow hair typically has more cortical fusi and ovoid bodies than horsehair under a microscope. If you can touch, horse hair typically feels more stronger and coarser than cow hair. Also the dark part in the middle of the hair (either the medulla or cortex depending on the image), is normally wider in horse hair.

Hope this helps!
WangwithaTang
Member
Member
Posts: 111
Joined: January 3rd, 2019, 8:48 pm
Has thanked: 5 times
Been thanked: 3 times

Re: Forensics C

Post by WangwithaTang »

mrsherwood18 wrote: March 3rd, 2020, 8:29 pm
WangwithaTang wrote: March 3rd, 2020, 4:00 pm How do you tell the difference between cow and horse hair? They look exactly the same.
Cow hair typically has more cortical fusi and ovoid bodies than horsehair under a microscope. If you can touch, horse hair typically feels more stronger and coarser than cow hair. Also the dark part in the middle of the hair (either the medulla or cortex depending on the image), is normally wider in horse hair.

Hope this helps!
Okay, thank you!
Locked

Return to “2020 Lab Events”

Who is online

Users browsing this forum: No registered users and 3 guests