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CPScienceDude wrote: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?

1. In my experience, flour turns pretty green, so imma say cornstarch.
2. Dog has a continuous medulla, while cat has broken up medulla 
3. PETE (?)

Crimesolver wrote:

CPScienceDude wrote: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?

answers (Click to Show Hidden Text)

1. In my experience, flour turns pretty green, so imma say cornstarch.
2. Dog has a continuous medulla, while cat has broken up medulla 
3. PETE (?)

1. Flour. https://www.youtube.com/watch?v=LnRx3nrKB8c
2. yup
3. I was thinking PVC. " PVC is in the glassy state at room temperature but is a special case because it can be easily modified to be rubbery by the addition of plasticizers." From http://www.appstate.edu/~clementsjs/polymerproperties/plastics_low_temp.pdf

CPScienceDude wrote:

Almost (Click to Show Hidden Text)

1. Flour. https://www.youtube.com/watch?v=LnRx3nrKB8c
2. yup
3. I was thinking PVC. " PVC is in the glassy state at room temperature but is a special case because it can be easily modified to be rubbery by the addition of plasticizers." From http://www.appstate.edu/~clementsjs/polymerproperties/plastics_low_temp.pdf

Crimesolver wrote:
Hmm, interesting -

1. What does AFIS stand for?
2. What is the most common type of fingerprint?
3. What is the difference between aluminum and magnesium?

1. Automated Fingerprint Identification System
2. Loop?
3. Magnesium reacts with water?

CPScienceDude wrote:

Crimesolver wrote:
Hmm, interesting -

1. What does AFIS stand for?
2. What is the most common type of fingerprint?
3. What is the difference between aluminum and magnesium?

Answers (Click to Show Hidden Text)

1. Automated Fingerprint Identification System
2. Loop?
3. Magnesium reacts with water?

i agree with everything but 3, i never really used water to react with metals (its kinda a waste of time imo because most of the metals on the list have no reaction with water, and if there is it is minimal) i would say that in HCl aluminum is usually covered in small bubbles and in comparison, magnesium reacts quite violently

Anapolis wrote:

CPScienceDude wrote:

Crimesolver wrote:
Hmm, interesting -

1. What does AFIS stand for?
2. What is the most common type of fingerprint?
3. What is the difference between aluminum and magnesium?

Answers (Click to Show Hidden Text)

1. Automated Fingerprint Identification System
2. Loop?
3. Magnesium reacts with water?

prety much... (Click to Show Hidden Text)

i agree with everything but 3, i never really used water to react with metals (its kinda a waste of time imo because most of the metals on the list have no reaction with water, and if there is it is minimal) i would say that in HCl aluminum is usually covered in small bubbles and in comparison, magnesium reacts quite violently

Rivkaaa wrote:1. What's the difference in dog and cat hair under a microscope?
2. How do you tell apart calcium carbonate and baking soda?
3. How do you distinguish a synthetic fiber from an animal fiber by smell (burn test)?

1. The cortex of the cat hair tends to be more divided/segmented than that of dog hair
2. Baking soda is basic while calcium carbonate is neutral
3. Synthetic fibers tend to smell somewhat sweet while animal fibers smell more putrid, like burning hair (because that's what it is)

wec01 wrote:

Rivkaaa wrote:1. What's the difference in dog and cat hair under a microscope?
2. How do you tell apart calcium carbonate and baking soda?
3. How do you distinguish a synthetic fiber from an animal fiber by smell (burn test)?

Answers (Click to Show Hidden Text)

1. The cortex of the cat hair tends to be more divided/segmented than that of dog hair
2. Baking soda is basic while calcium carbonate is neutral
3. Synthetic fibers tend to smell somewhat sweet while animal fibers smell more putrid, like burning hair (because that's what it is)