Crime Busters B

Test your knowledge of various Science Olympiad events.
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Sapphire
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Crime Busters B

Post by Sapphire »

I haven't even registered for Science Olympiad yet, but let's get this started!

1. What are the three different types of fingerprints found at crime scenes? How are they formed?
2. What are three different ways to develop latent fingerprints? In which order should they be used if one of the previous methods fails?
3. What percent of people have loop fingerprints? What about whorls and arches?
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Re: Crime Busters B

Post by Nooran008 »

Sapphire wrote: October 3rd, 2019, 6:11 pm I haven't even registered for Science Olympiad yet, but let's get this started!

1. What are the three different types of fingerprints found at crime scenes? How are they formed?
2. What are three different ways to develop latent fingerprints? In which order should they be used if one of the previous methods fails?
3. What percent of people have loop fingerprints? What about whorls and arches?

Maybe?? 1.Loop, whorl, and arch. They are formed when the friction ridges touch the surface of something?
2. I can name one but... By dusting a powder on where the fingerprint was
3. Loops: 65% Whorls: 35% Arches: 5%
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Re: Crime Busters B

Post by Sapphire »

Maybe?? 1.Loop, whorl, and arch. They are formed when the friction ridges touch the surface of something?
2. I can name one but... By dusting a powder on where the fingerprint was
3. Loops: 65% Whorls: 35% Arches: 5%
Sorry about the delay!

1. For the first part, I was looking for something more along the lines of patent, latent, and plastic, but I'll take that. You're right about the second part though! It is also helpful to know fingerprints are formed in utero development at around 10 weeks
2. Some other ways of developing fingerprints would be iodine fuming and ninhydrin. Cyanoacrylate is also a good way to develop fingerprints on most non-porous surfaces. I think the order of development should be iodine, ninhydrin, physical, then silver nitrate, but I'm not too sure about that actually.
3. Yup!

Your turn.
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Re: Crime Busters B

Post by azboy1910 »

It's been like 10 months so I guess I'll go.

1) What does AFIS stand for?

2) What is the stationary phase in paper chromatography? What is the mobile phase?

3) Which plastic has a resin code of 1?
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Re: Crime Busters B

Post by Sapphire »

1. Automated fingerprint identification system
2. The stationary phase is the paper and the mobile phase is water.
3. PET
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Re: Crime Busters B

Post by azboy1910 »

Sapphire wrote: February 16th, 2020, 2:49 pm 1. Automated fingerprint identification system
2. The stationary phase is the paper and the mobile phase is water.
3. PET
All good! Your turn!
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Re: Crime Busters B

Post by Sapphire »

1.) Which plastics are created using a condensation reaction?

2.) From innermost to outermost, what are the three main layers of hair?

3.) What kind of scales does cat hair have? What kind of medulla does it usually have?

4.) What is the shape of the root bulb of human hair?

5.) What is the chemical name for alka-seltzer and what are its two components?
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Re: Crime Busters B

Post by Locoholic »

Sapphire wrote: February 23rd, 2020, 11:12 am 1.) Which plastics are created using a condensation reaction?

2.) From innermost to outermost, what are the three main layers of hair?

3.) What kind of scales does cat hair have? What kind of medulla does it usually have?

4.) What is the shape of the root bulb of human hair?

5.) What is the chemical name for alka-seltzer and what are its two components?
1. Polyamides, polyesters 2. Medulla, cortex, cuticle 3. Imbricate? (Idk). A wide medulla? 4. It kinda has a bulge compared to the rest of the hair shaft. 5. Well I’m not sure about the chemical name, and I thought it had 3 components: sodium bicarbonate, citric acid, and acetylsalicylic acid (aspirin).

:/
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Re: Crime Busters B

Post by azboy1910 »

It has been 5 months since the last post, so I would like to get this started up again.

1. What is the molecular weight of ascorbic acid?
2. The pH of a substance stands for "power of hydrogen." Using this information, what do you think that pOH stands for? What is the connection between the two?
3. Write a balanced equation showing the activity of the reaction between and .
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