Crime Busters B

knowthewrightstuff
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Conductivity meter

Postby knowthewrightstuff » Tue Jan 16, 2018 8:18 pm

Does anyone know of a good conductivity meter that is allowed for Crime Busters?

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WhatScience?
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Re: Conductivity meter

Postby WhatScience? » Tue Jan 16, 2018 9:02 pm

knowthewrightstuff wrote:Does anyone know of a good conductivity meter that is allowed for Crime Busters?

Ask your science teacher....I couldn't find a good one for a reasonable price...my teacher had a bunch in her closet

You ever use the things with the 9 volt and the 2 wires that make a sound???
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Thermodynamics, Potions and Poisons, Disease Detectives, Optics, and Towers

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Re: Crime Busters B

Postby Birdmusic » Sat Jan 20, 2018 6:21 pm

Under the rules, it says you have to know the difference between plant, animal, and synthetic fibers. Do you have to be able to identify the specific type, like wool, silk, or rayon? Or is knowing whether it's animal, plant, or synthetic good enough?
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Crime Busters: 1/2
Disease Detectives: 1/5
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shrewdPanther46
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Re: Crime Busters B

Postby shrewdPanther46 » Sat Jan 20, 2018 6:28 pm

u only need animal plant and synthetic. Some competitions, they have asked for specific, so its good to know, but u really only need animal plant synthetic.
salty

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Re: Crime Busters B

Postby Tailsfan101 » Sat Jan 20, 2018 7:45 pm

Birdmusic wrote:Under the rules, it says you have to know the difference between plant, animal, and synthetic fibers. Do you have to be able to identify the specific type, like wool, silk, or rayon? Or is knowing whether it's animal, plant, or synthetic good enough?

The rules specify that the Crime Busters competitors need only to identify between synthetic, animal, and vegetable fibers. I believe that Forensics has their competitors identify the specific fiber, but this is not the same in Crime Busters.
2018 Treasure Valley Homeschool Wiki (Division B)
2018
State/Nats
Crime: 1/35
Road: 1/44
DD: 2/37
MM: 3/46

2017
State/Nats
DD: 1/16
DP: -/50
Road: 2/51
FF: 4/59

Hopeful 2019 events: Road Scholar, Crime Busters, Disease Detectives, Heredity
Assassinator for game #118

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Re: Crime Busters B

Postby Birdmusic » Sat Jan 20, 2018 8:31 pm

Tailsfan101 wrote:
Birdmusic wrote:Under the rules, it says you have to know the difference between plant, animal, and synthetic fibers. Do you have to be able to identify the specific type, like wool, silk, or rayon? Or is knowing whether it's animal, plant, or synthetic good enough?

The rules specify that the Crime Busters competitors need only to identify between synthetic, animal, and vegetable fibers. I believe that Forensics has their competitors identify the specific fiber, but this is not the same in Crime Busters.

Thank you!
Science is an art.
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2018 Results
Regionals/States
Crime Busters: 1/2
Disease Detectives: 1/5
Hovercraft (both builds failed, rip): 11/9

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Re: Crime Busters B

Postby Polarrr » Sun Jan 21, 2018 3:41 am

Birdmusic wrote:
Tailsfan101 wrote:
Birdmusic wrote:Under the rules, it says you have to know the difference between plant, animal, and synthetic fibers. Do you have to be able to identify the specific type, like wool, silk, or rayon? Or is knowing whether it's animal, plant, or synthetic good enough?

The rules specify that the Crime Busters competitors need only to identify between synthetic, animal, and vegetable fibers. I believe that Forensics has their competitors identify the specific fiber, but this is not the same in Crime Busters.

Thank you!


In the rules this year, it says that you don't need to know specifics. However, I do know that last year, many invitationals I saw tests for had sometimes asked for specifics, while others just asked for the general type. I feel that it all depends on the type of test proctor you get. Since not all of them follow the rules word for word, I suggest knowing the difference between specific fibers (nylon, polyester, cotton, linen, wool, silk) just in case, however, it really shouldn't be necessary if the test proctors follow the rules.

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Re: Crime Busters B

Postby ngangal » Tue Jan 23, 2018 5:41 pm

My team is having trouble identifying the difference between Aluminum, Zinc and Tin. We do notice some fizz with Tin. However, hard to differentiate between Aluminum & Tin. Theoretically, Aluminum is supposed to have a delayed reaction with HCl but we could hardly notice any fizz even after long time. Only way to tell is based on shine but its very hard for kids to notice and depends on the sample. Any suggestions?

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Re: Crime Busters B

Postby shrewdPanther46 » Tue Jan 23, 2018 6:32 pm

Between aluminum and tin, it is generally fairly simple to recognize the distinctive yellowish tinge that tin possesses.
salty

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Re: Crime Busters B

Postby ngangal » Wed Jan 24, 2018 12:24 am

shrewdPanther46 wrote:Between aluminum and tin, it is generally fairly simple to recognize the distinctive yellowish tinge that tin possesses.

Thanks

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Re: Crime Busters B

Postby Tailsfan101 » Wed Jan 24, 2018 3:00 pm

Also, zinc has a higher density and fizzes with HCl.
2018 Treasure Valley Homeschool Wiki (Division B)
2018
State/Nats
Crime: 1/35
Road: 1/44
DD: 2/37
MM: 3/46

2017
State/Nats
DD: 1/16
DP: -/50
Road: 2/51
FF: 4/59

Hopeful 2019 events: Road Scholar, Crime Busters, Disease Detectives, Heredity
Assassinator for game #118

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Re: Crime Busters B

Postby Benewcomb » Wed Jan 31, 2018 4:34 pm

Would we have to know the difference between types of plastic? Because I haven’t gotten to check if we have that information in our binder.
"Shut up" - Yours Kinda Truly.

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Re: Crime Busters B

Postby Tailsfan101 » Wed Jan 31, 2018 10:04 pm

Benewcomb wrote:Would we have to know the difference between types of plastic? Because I haven’t gotten to check if we have that information in our binder.

Plastics you need to differentiate:
PETE
HDPE
PVC
LDPE
PP
PS
PMMA
2018 Treasure Valley Homeschool Wiki (Division B)
2018
State/Nats
Crime: 1/35
Road: 1/44
DD: 2/37
MM: 3/46

2017
State/Nats
DD: 1/16
DP: -/50
Road: 2/51
FF: 4/59

Hopeful 2019 events: Road Scholar, Crime Busters, Disease Detectives, Heredity
Assassinator for game #118

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Re: Crime Busters B

Postby Benewcomb » Wed Jan 31, 2018 11:28 pm

Tailsfan101 wrote:
Benewcomb wrote:Would we have to know the difference between types of plastic? Because I haven’t gotten to check if we have that information in our binder.

Plastics you need to differentiate:
PETE
HDPE
PVC
LDPE
PP
PS
PMMA


K thanks. I’m on it.
"Shut up" - Yours Kinda Truly.

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Re: Crime Busters B

Postby pandascienceolympiad » Sun Feb 04, 2018 10:07 pm

Birdmusic wrote:Hi, I'm new to this event (and chemistry in general), so I have a couple of questions.

1) When my partner and I mixed iodine with flour mixed with water or cornstarch mixed with water, it didn't turn dark blue, any ideas why? We tried increasing the amount of water, flour/cornstarch, and iodine, but nothing happened still.

2) If one powder in a mixture dissolved and another didn't, how would you know? Wouldn't the water just be cloudy if one dissolved? Also, how would you know whether only one thing reacted with the HCl and iodine or both reacted?


1) Try to not mix the flour or cornstarch in water first. Also, your solutes and solvents might be old, try using newer ones.
2) Try looking at the mixture under a microscope first, and try and come up with possible powders it could be based on your results


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