Forensics C

Test your knowledge of various Science Olympiad events.
User avatar
sciduck
Exalted Member
Exalted Member
Posts: 98
Joined: May 7th, 2016, 4:50 pm
Division: C
State: MN
Location: Wayzata

Re: Forensics C

Postby sciduck » January 19th, 2017, 4:39 pm

When do fingerprints first form? and
Where do they originate?
Uhhhh
10th week of pregnancy on the basal layer?
SCIDUCK wants to fight!
——————————————— SCIDUCK uses CONFUSION! ———————————————

Lumitailz
Member
Member
Posts: 20
Joined: March 15th, 2016, 8:06 pm
Division: C
State: GA

Re: Forensics C

Postby Lumitailz » January 23rd, 2017, 3:35 pm

When do fingerprints first form? and
Where do they originate?
Uhhhh
10th week of pregnancy on the basal layer?
yup your turn
dermal papillae, pretty much same thing lol

User avatar
sciduck
Exalted Member
Exalted Member
Posts: 98
Joined: May 7th, 2016, 4:50 pm
Division: C
State: MN
Location: Wayzata

Re: Forensics C

Postby sciduck » January 23rd, 2017, 5:38 pm

The "plaster of Paris" contains what chemical?
SCIDUCK wants to fight!
——————————————— SCIDUCK uses CONFUSION! ———————————————

User avatar
me-myself_i
Member
Member
Posts: 6
Joined: December 20th, 2016, 10:19 am
Division: C
State: IN
Location: Close to Purdue

Re: Forensics C

Postby me-myself_i » January 24th, 2017, 8:02 am

The "plaster of Paris" contains what chemical?
:P 8-)
Gypsum
2015(B)1st:Road Scholar(regional)
2016(B)1st:RoadScholar2nd:Crave the Wave3rd:Fossils,Reach for the Stars(regional)
2017(C)2nd:Write It Do It(regional)

Being happy about no Bloomington this year :D

User avatar
sciduck
Exalted Member
Exalted Member
Posts: 98
Joined: May 7th, 2016, 4:50 pm
Division: C
State: MN
Location: Wayzata

Re: Forensics C

Postby sciduck » January 30th, 2017, 5:31 pm

The "plaster of Paris" contains what chemical?
:P 8-)
Gypsum
I was actually looking for
calcium sulfate, but you're not wrong.
Your turn.
SCIDUCK wants to fight!
——————————————— SCIDUCK uses CONFUSION! ———————————————

User avatar
yellow_squirtle
Member
Member
Posts: 18
Joined: August 18th, 2014, 6:02 pm
Division: C
State: TX

Re: Forensics C

Postby yellow_squirtle » February 19th, 2017, 11:59 am

Let's revive this forum, shall we !!!

An unknown sample turns green when dissolved in water with Benedict's reagent and heated. What does this mean? Also, why does sucrose not provide a positive test result when it contains two sugars, one of them being glucose? (What is the other sugar that makes up sucrose?)

There are three parts to this questiono

ibaemax_o-o
Member
Member
Posts: 1
Joined: December 23rd, 2016, 7:55 pm
Division: C
State: -

Re: Forensics C

Postby ibaemax_o-o » February 19th, 2017, 12:24 pm

Let's revive this forum, shall we !!!

An unknown sample turns green when dissolved in water with Benedict's reagent and heated. What does this mean? Also, why does sucrose not provide a positive test result when it contains two sugars, one of them being glucose? (What is the other sugar that makes up sucrose?)

There are three parts to this questiono
I believe
that if the unknown sample turns green it indicates that it contains trace amounts of a reducing sugar. Sucrose does not provide a positive test result because it isn't a reducing sugar. Even though sucrose is made up of two reducing sugars glucose and fructose, sucrose is a disaccharide formed by the bonding of glucose and fructose through dehydration synthesis which results in a glycosidic bond that cannot be opened into open chain form with an aldehyde group (a characteristic of a reducing sugar).

User avatar
yellow_squirtle
Member
Member
Posts: 18
Joined: August 18th, 2014, 6:02 pm
Division: C
State: TX

Re: Forensics C

Postby yellow_squirtle » February 19th, 2017, 1:01 pm

Let's revive this forum, shall we !!!

An unknown sample turns green when dissolved in water with Benedict's reagent and heated. What does this mean? Also, why does sucrose not provide a positive test result when it contains two sugars, one of them being glucose? (What is the other sugar that makes up sucrose?)

There are three parts to this questiono
I believe
that if the unknown sample turns green it indicates that it contains trace amounts of a reducing sugar. Sucrose does not provide a positive test result because it isn't a reducing sugar. Even though sucrose is made up of two reducing sugars glucose and fructose, sucrose is a disaccharide formed by the bonding of glucose and fructose through dehydration synthesis which results in a glycosidic bond that cannot be opened into open chain form with an aldehyde group (a characteristic of a reducing sugar).
Correct! Cute nickname, btw :mrgreen: :mrgreen: :mrgreen: :mrgreen:


Return to “2017 Question Marathons”

Who is online

Users browsing this forum: No registered users and 1 guest