Can't Judge a Powder B

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SolonSOohio
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Re: Can't Judge a Powder B

Post by SolonSOohio »

haven chuck wrote:
SolonSOohio wrote:I have some questions:
How do you tell if a powder is hygroscopic? (procedures)
How do you test conductivity if you aren't allowed to bring a multimeter? (tester used)
A) Look in the 2007 test packet (2006 tests). There is an excellent description of the experiment that they were looking for testing for hygroscopic-ness on the CJAP test answer key.
B) Why wouldn't you be allowed to bring a multimeter? It says in the rules that a conductivity tester is allowed? :?:
I asked the FAQ on national science olympiad page and they said you can't bring a multimeter. See here: http://soinc.org/node/477
Also what is the link to the "2007 test packet (2006 tests)".
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Re: Can't Judge a Powder B

Post by ichaelm »

There's a difference between a conductivity meter and a multimeter. It's like the difference between resistance and resistivity (I'm in shock value). Basically though, you need to either make a conductivity meter, or you can buy one of those fancy digital ones.
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Re: Can't Judge a Powder B

Post by SolonSOohio »

ichaelm wrote:There's a difference between a conductivity meter and a multimeter. It's like the difference between resistance and resistivity (I'm in shock value). Basically though, you need to either make a conductivity meter, or you can buy one of those fancy digital ones.
Yes, but it said you couldn't bring a multimeter for measuring resistance. What should i bring then?
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Re: Can't Judge a Powder B

Post by ichaelm »

You can make one out of a battery, a LED, a small incandescent lamp, and two pieces of metal. The LED will be highly sensitive, the lamp will be less sensitive (they should be in parallel). Or, I can trade you one at the swap meet! :lol:
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Re: Can't Judge a Powder B

Post by haven chuck »

2010 Can't Judge a Powder- NATIONAL CHAMPIONS
2010 Science Crimebusters- 3rd in the NATION
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Re: Can't Judge a Powder B

Post by ichaelm »

Oh sure! But the shipping is gonna be a killing... Lol seriously, if you anyone needs one I can make a simple one in 5 seconds and give it to you friday! Or ask your shock value guy! If he can't do it then he needs to practice more :?

Edit: Wait a minute. That's like 50 dollars. Without shipping. That's completely unreasonable. If you do buy one, don't fall for something like that!
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Re: Can't Judge a Powder B

Post by haven chuck »

We already had it and used it for states, but I wanted to make sure I wasn't missing something and was going to bring a DQ upon myself. Thanks for the offer though. :)
2010 Can't Judge a Powder- NATIONAL CHAMPIONS
2010 Science Crimebusters- 3rd in the NATION
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Re: Can't Judge a Powder B

Post by ichaelm »

Oh ok then :)
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Re: Can't Judge a Powder B

Post by SidT »

I know they let some of you use a graduated cylinder at States, but will they allow it at Nationals?
2010 Nationals:
Anatomy: 1st
Science Crime Busters: 5th
Bio-Process Lab: 5th
Can't Judge a Powder: 10th
Disease Detectives: 15th
Overall Team: 2nd
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Re: Can't Judge a Powder B

Post by SolonSOohio »

I'm preety sure you can because how else would you measure the volume of the liquid? It depends on the national judges.
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