Crime Busters B

amk578
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Re: Crime Busters B

Post by amk578 » January 9th, 2019, 4:48 pm

Cool!

1. What is the most common fingerprint?
2. What does AFIS stand for?
3. What is the only acidic powder? What is its chemical formula?
4. You are given a mixture that is slightly tan in color. When you place drops of water on it, the water kind of gels up. Then, you pour a few drops of HCl into the mixture and there is fizzing for almost a minute. What are the two substances that composes the mixture?
5. What polymer floats in water and is not translucent?
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Re: Crime Busters B

Post by ledwards003 » January 9th, 2019, 5:17 pm

amk578 wrote:Cool!

1. What is the most common fingerprint?
2. What does AFIS stand for?
3. What is the only acidic powder? What is its chemical formula?
4. You are given a mixture that is slightly tan in color. When you place drops of water on it, the water kind of gels up. Then, you pour a few drops of HCl into the mixture and there is fizzing for almost a minute. What are the two substances that composes the mixture?
5. What polymer floats in water and is not translucent?
Can I try my hand at this?
1. Loops are the most common fingerprint
2. IAFIS (I am assuming that is what you meant because I do not know otherwise) stands for Integrated Automated Fingerprint Identification System
3. Vitamin C, with chemical formula C6H8O6
4. Gelatin is the first and... calcium carbonate? (sorry, I typically pay attention to solubility rather than how long the fizz lasts)
5. Would this be polystyrene?
:)

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Re: Crime Busters B

Post by amk578 » January 9th, 2019, 5:38 pm

ledwards003 wrote:
amk578 wrote:Cool!

1. What is the most common fingerprint?
2. What does AFIS stand for?
3. What is the only acidic powder? What is its chemical formula?
4. You are given a mixture that is slightly tan in color. When you place drops of water on it, the water kind of gels up. Then, you pour a few drops of HCl into the mixture and there is fizzing for almost a minute. What are the two substances that composes the mixture?
5. What polymer floats in water and is not translucent?
Can I try my hand at this?
1. Loops are the most common fingerprint
2. IAFIS (I am assuming that is what you meant because I do not know otherwise) stands for Integrated Automated Fingerprint Identification System
3. Vitamin C, with chemical formula C6H8O6
4. Gelatin is the first and... calcium carbonate? (sorry, I typically pay attention to solubility rather than how long the fizz lasts)
5. Would this be polystyrene?
1. Correct
2. Correct
3. Correct
4. Gelatin is right, but I was thinking baking soda because it is notorious for fizzing continuously
5. No, PS doesn't float in water, the correct answer is polypropylene

Your turn!
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Re: Crime Busters B

Post by CPScienceDude » February 4th, 2019, 10:13 am

I'll kick this back up again.
1. What plastic half sinks half floats in water?
2. When burned, this synthetic fiber produces a hard black bead, and when withdrawn it stops burning. What is this fiber?
3. This powder has a pH of 2, and turns Iodine clear. What is this powder?
4. You determine a liquid to be either hydrogen peroxide or water. How do you tell the difference?
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Re: Crime Busters B

Post by jimmy-bond » February 4th, 2019, 10:53 am

CPScienceDude wrote:I'll kick this back up again.
1. What plastic half sinks half floats in water?
2. When burned, this synthetic fiber produces a hard black bead, and when withdrawn it stops burning. What is this fiber?
3. This powder has a pH of 2, and turns Iodine clear. What is this powder?
4. You determine a liquid to be either hydrogen peroxide or water. How do you tell the difference?
1. Polystyrene
2. Spandex
3. Vitamin C
4. Shake to see if bubbles form
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CriB(36), DD(35), FF(2), MM(20)

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Re: Crime Busters B

Post by CPScienceDude » February 4th, 2019, 11:02 am

jimmy-bond wrote:
CPScienceDude wrote:I'll kick this back up again.
1. What plastic half sinks half floats in water?
2. When burned, this synthetic fiber produces a hard black bead, and when withdrawn it stops burning. What is this fiber?
3. This powder has a pH of 2, and turns Iodine clear. What is this powder?
4. You determine a liquid to be either hydrogen peroxide or water. How do you tell the difference?
1. Polystyrene
2. Spandex
3. Vitamin C
4. Shake to see if bubbles form
1. Yup
2. I was thinking Nylon, but I'm not sure if Spandex fits the bill too. Maybe, but idk.
3. Yup
4. That's one way but Iodine helps too. Iodine in hydrogen peroxide bubble after almost a minute.
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Re: Crime Busters B

Post by jimmy-bond » February 4th, 2019, 1:05 pm

CPScienceDude wrote:
1. Yup
2. I was thinking Nylon, but I'm not sure if Spandex fits the bill too. Maybe, but idk.
3. Yup
4. That's one way but Iodine helps too. Iodine in hydrogen peroxide bubble after almost a minute.
For #4, I tend to essentially sprint through ID so I use the shake test. It takes a literal 2 seconds, but sometimes water gets fairly bubbly, so it isn't the most efficient I admit.
1. Describe the use of ninhydrin to develop fingerprints.
2. Name a solution that can be used in a float test to differentiate HDPE and LDPE.
3. What is the thickest layer in a strand of hair?
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Code, CL, 4&6, WQ
Code, DP, 4&6, WQ
Code(16), DD(40), FQ(39),4&6(36), WQ(27)
CriB(26), DP (11), FF(1), MM(14), P&P(6)
CriB(36), DD(35), FF(2), MM(20)

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Re: Crime Busters B

Post by CPScienceDude » February 5th, 2019, 8:27 am

1. It reacts with the amino acids and turns a dark blue/purple.
2. 46% Isopropyl Alcohol
3. The cortex
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Re: Crime Busters B

Post by jimmy-bond » February 6th, 2019, 8:02 pm

CPScienceDude wrote:
1. It reacts with the amino acids and turns a dark blue/purple.
2. 46% Isopropyl Alcohol
3. The cortex
Correct. Your turn.
A dyslexic man walks into a bra.
Code, CL, 4&6, WQ
Code, DP, 4&6, WQ
Code(16), DD(40), FQ(39),4&6(36), WQ(27)
CriB(26), DP (11), FF(1), MM(14), P&P(6)
CriB(36), DD(35), FF(2), MM(20)

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Re: Crime Busters B

Post by CPScienceDude » February 7th, 2019, 3:18 pm

1. What Powder has a pH of 6 and turns I2 blue?
2. Describe the difference in appearance of dog and cat hair while under a microscope.
3. You are given a plastic. It sinks in water, 10% NaCl, and saturated NaCl. You notice it it is rubbery. What is this plastic?
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