Can't Judge A Powder B

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Can't Judge A Powder B

Post by Jim_R » August 4th, 2013, 2:57 pm

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Re: Can't Judge A Powder B

Post by silverheart7 » September 12th, 2013, 6:16 pm

I looked at the wiki today. Is the list of observations given there the best way to format your personal observations during competition? Or is there a more concise way?
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Re: Can't Judge A Powder B

Post by robotman » September 15th, 2013, 7:50 pm

The general goal of the event is to make as many detailed observations as possible during the time you have to observe.
The best method to do so is a lot of practice, and to create a method that you follow each time you test a powder, and to never vary that pattern once you get it down. The list on the wiki is a good place to start, it has what you need for most tests. My suggestion is to just practice as much as possible, and determine a method that works best for you. Just remember that concise is not always best for CJAP, make sure you get all the information down in a way that you can use it to prove your responses to the questions.
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Re: Can't Judge A Powder B

Post by jma » September 28th, 2013, 6:32 am

Where can I buy NaOh & HCL? Thanks

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Re: Can't Judge A Powder B

Post by chalker » September 28th, 2013, 7:08 am

jma wrote:Where can I buy NaOh & HCL? Thanks
You can always go to one of the big online science suppliers, such as Fisher Scientific (http://www.fishersci.com). However most common chemicals are available in local stores, just sold under different names. Check out: http://www.csun.edu/science/ref/equipme ... common.htm

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Re: Can't Judge A Powder B

Post by jma » September 28th, 2013, 10:34 am

chalker wrote:
jma wrote:Where can I buy NaOh & HCL? Thanks
You can always go to one of the big online science suppliers, such as Fisher Scientific (http://www.fishersci.com). However most common chemicals are available in local stores, just sold under different names. Check out: http://www.csun.edu/science/ref/equipme ... common.htm
Thanks again!

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Chemicals

Post by siri » October 14th, 2013, 5:28 pm

Where can we buy chemicals(salts/powders) for testing? What salts are usually used? Any help is appreciated.

Thanks.

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Re: Chemicals

Post by hpfananu » October 16th, 2013, 2:05 pm

siri wrote:Where can we buy chemicals(salts/powders) for testing? What salts are usually used? Any help is appreciated.

Thanks.
They can give you any powder really. Sometimes, they could give NaCl but usually they just give some copper containing compound because the color isn't white. You can practice with anything really; sugar, baking powder, cornstarch, or any other powder that you can find in your house. Also, for practicing with chemicals, you can use any liquid-like substance in your house. We used soap or Pine-Sol on more than one occasion and it makes for great practice.
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Re: Chemicals

Post by silverheart7 » October 17th, 2013, 12:36 pm

siri wrote:Where can we buy chemicals(salts/powders) for testing? What salts are usually used? Any help is appreciated.

Thanks.
There is a store afiliated with Science Olympiad that sells powders for Crime and Can't Judge. Check soinc for the link?
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Re: Can't Judge A Powder B

Post by Katkatkat » November 13th, 2013, 10:36 am

Can someone please tell me the strength of the sodiumhydroxide solution? I found a local store, but I need to know the percentage.

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