Crime Busters B

User avatar
Sapphire
Member
Member
Posts: 27
Joined: April 15th, 2019, 4:52 pm
Division: B
State: MI
Location: Somewhere in NGC5128
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by Sapphire » April 30th, 2019, 6:57 pm

I was looking for that it undergoes an endothermic reaction or heats up.
Your turn

wec01
Member
Member
Posts: 220
Joined: February 22nd, 2019, 4:02 pm
Division: Grad
State: VA
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by wec01 » April 30th, 2019, 7:16 pm

In what order should iodine fuming, ninhydrin, and silver nitrate be attempted for revealing fingerprints? Explain?
think about what each method does chemically to the print
2019 Division C Nationals Medals:
4th place Fossils
5th place Sounds of Music
2nd place Thermodynamics

User avatar
Sapphire
Member
Member
Posts: 27
Joined: April 15th, 2019, 4:52 pm
Division: B
State: MI
Location: Somewhere in NGC5128
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by Sapphire » May 1st, 2019, 12:58 pm

I don't even know what any of those are.

Okay, so I did some research and I'm going to say:
1. Iodine fuming first, because it's completely reversible and fast
2.  Ninhydrin because it shouldn't be first or last
3. Silver nitrate last because it is destructive and will cause other methods to not work

wec01
Member
Member
Posts: 220
Joined: February 22nd, 2019, 4:02 pm
Division: Grad
State: VA
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by wec01 » May 1st, 2019, 1:59 pm

Sapphire wrote:I don't even know what any of those are.

Okay, so I did some research and I'm going to say:
1. Iodine fuming first, because it's completely reversible and fast
2.  Ninhydrin because it shouldn't be first or last
3. Silver nitrate last because it is destructive and will cause other methods to not work
Yep, your turn
2019 Division C Nationals Medals:
4th place Fossils
5th place Sounds of Music
2nd place Thermodynamics

User avatar
Sapphire
Member
Member
Posts: 27
Joined: April 15th, 2019, 4:52 pm
Division: B
State: MI
Location: Somewhere in NGC5128
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by Sapphire » May 2nd, 2019, 2:52 pm

1. What is the study of fingerprints called?
2. What powder would incriminate someone who has been in contact with chalk?
3. What powder would incriminate someone who has been in contact with salt and vinegar flavored chips?

wec01
Member
Member
Posts: 220
Joined: February 22nd, 2019, 4:02 pm
Division: Grad
State: VA
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by wec01 » May 2nd, 2019, 5:15 pm

Sapphire wrote:1. What is the study of fingerprints called?
2. What powder would incriminate someone who has been in contact with chalk?
3. What powder would incriminate someone who has been in contact with salt and vinegar flavored chips?
1. dactyloscopy
2. calcium carbonate
3. sodium acetate
2019 Division C Nationals Medals:
4th place Fossils
5th place Sounds of Music
2nd place Thermodynamics

User avatar
Sapphire
Member
Member
Posts: 27
Joined: April 15th, 2019, 4:52 pm
Division: B
State: MI
Location: Somewhere in NGC5128
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by Sapphire » May 3rd, 2019, 4:41 pm

Yep!

Your turn.

wec01
Member
Member
Posts: 220
Joined: February 22nd, 2019, 4:02 pm
Division: Grad
State: VA
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by wec01 » May 4th, 2019, 9:15 am

1) In paper chromatography, what is the stationary phase and what is the mobile phase?
2) How are Rfs measured?
3) What are two types of chromatography other than paper chromatography?
2019 Division C Nationals Medals:
4th place Fossils
5th place Sounds of Music
2nd place Thermodynamics

User avatar
Sapphire
Member
Member
Posts: 27
Joined: April 15th, 2019, 4:52 pm
Division: B
State: MI
Location: Somewhere in NGC5128
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by Sapphire » May 4th, 2019, 10:18 am

wec01 wrote:1) In paper chromatography, what is the stationary phase and what is the mobile phase?
2) How are Rfs measured?
3) What are two types of chromatography other than paper chromatography?
1. Paper is stationary and water is mobile
2. Distance traveled by solvent divided by distance traveled by spot
3. TLC (thin layer chromatography) and... umm... IDK?

wec01
Member
Member
Posts: 220
Joined: February 22nd, 2019, 4:02 pm
Division: Grad
State: VA
Has thanked: 0
Been thanked: 0

Re: Crime Busters B

Post by wec01 » May 4th, 2019, 2:02 pm

Sapphire wrote:
wec01 wrote:1) In paper chromatography, what is the stationary phase and what is the mobile phase?
2) How are Rfs measured?
3) What are two types of chromatography other than paper chromatography?
1. Paper is stationary and water is mobile
2. Distance traveled by solvent divided by distance traveled by spot
3. TLC (thin layer chromatography) and... umm... IDK?
Yep, for number 3 there's also gas chromatography and liquid chromatography Your turn
2019 Division C Nationals Medals:
4th place Fossils
5th place Sounds of Music
2nd place Thermodynamics

Post Reply

Return to “2019 Question Marathons”

Who is online

Users browsing this forum: No registered users and 1 guest