Crime Busters B

[Sapphire]

Correct, but (Click to Show Hidden Text)

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

Your turn

[wec01]

In what order should iodine fuming, ninhydrin, and silver nitrate be attempted for revealing fingerprints? Explain?

Hint (Click to Show Hidden Text)

think about what each method does chemically to the print

[Sapphire]

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

Okay, so I did some research and I'm going to say:

Answers? (Click to Show Hidden Text)

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]

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

Okay, so I did some research and I'm going to say:

Answers? (Click to Show Hidden Text)

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

[Sapphire]

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]

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?

Answers (Click to Show Hidden Text)

1. dactyloscopy
2. calcium carbonate
3. sodium acetate

[Sapphire]

Yep!

Your turn.

[wec01]

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?

[Sapphire]

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?

Answers (Click to Show Hidden Text)

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]

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?

Answers (Click to Show Hidden Text)

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