Can't Judge a Powder B

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Re: Can't Judge a Powder B

Postby robotman » November 2nd, 2010, 4:30 pm

first of all conducts? doesn't really ask anything

Second these are easy properties to find out yourself.

Third I have noticed that it sometimes exhibits a slightly soapy oder (
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Re: Can't Judge a Powder B

Postby EastStroudsburg13 » November 2nd, 2010, 4:35 pm

Just to answer your question, NaOH does conduct, given that it is an ionic compound. Like robotman said, you could have found that with some research, but I felt like being nice. And it probably does have a soapy odor since it exhibits some of the same properties as most soaps, including the fact that they are bases.
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Re: Can't Judge a Powder B

Postby HannahD413 » November 23rd, 2010, 4:26 pm

On the wiki and some of the tests on the test exchange, in addition to the examples of "good" observations, it appears you need to be measuring the volume of the substances you are given, and I was wondering how you are supposed to accomplish this. In the rules, it does not say you can bring a graduated cylinder or something similar to that does it? And it is not included in the things that the event supervisor has to bring. I am sorry if I just missed something in the rules, but if someone could tell me where it is that would be appreciated.

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Re: Can't Judge a Powder B

Postby robotman » November 23rd, 2010, 7:12 pm

On the wiki and some of the tests on the test exchange, in addition to the examples of "good" observations, it appears you need to be measuring the volume of the substances you are given, and I was wondering how you are supposed to accomplish this. In the rules, it does not say you can bring a graduated cylinder or something similar to that does it? And it is not included in the things that the event supervisor has to bring. I am sorry if I just missed something in the rules, but if someone could tell me where it is that would be appreciated.
There are a couple of ways to do this.
First is the volume of the original power (i.e. 5ml) which would come from the container they give you or if there is no way to measure volume on the container just using relatives (i.e. Half, 3/4)
Second is the amount used in a reaction My partner and I used relatives for this (i.e half a spatula) or if we had a balance 1/2 a spatula == 1g we would write
"1/2 a spatula(~1g) of powder turns the 2ml of water magenta"
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Re: Can't Judge a Powder B

Postby HannahD413 » November 24th, 2010, 6:10 am

On the wiki and some of the tests on the test exchange, in addition to the examples of "good" observations, it appears you need to be measuring the volume of the substances you are given, and I was wondering how you are supposed to accomplish this. In the rules, it does not say you can bring a graduated cylinder or something similar to that does it? And it is not included in the things that the event supervisor has to bring. I am sorry if I just missed something in the rules, but if someone could tell me where it is that would be appreciated.
There are a couple of ways to do this.
First is the volume of the original power (i.e. 5ml) which would come from the container they give you or if there is no way to measure volume on the container just using relatives (i.e. Half, 3/4)
Second is the amount used in a reaction My partner and I used relatives for this (i.e half a spatula) or if we had a balance 1/2 a spatula == 1g we would write
"1/2 a spatula(~1g) of powder turns the 2ml of water magenta"
Okay thanks. Also, are you allowed a graduated pipette, or just an eye dropper?
Last edited by HannahD413 on November 24th, 2010, 6:28 am, edited 1 time in total.

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Re: Can't Judge a Powder B

Postby purplepeopleeater » November 24th, 2010, 6:23 am

yes you can bring graduated pipettes.
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Re: Can't Judge a Powder B

Postby cvmsrocksyoursocks » December 16th, 2010, 5:43 pm

I have two questions, first of all if I get everything on this page: http://www.scioly.org/wiki/Cant_Judge_A_Powder will that be enough for my notes, and also can you just memorize some stuff ahead of time, like the properties or water, NaOH, and HCl (I mean wouldn't that be easier, so you don't have to waste time and test it?)

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Re: Can't Judge a Powder B

Postby purplepeopleeater » December 16th, 2010, 6:38 pm

Um... just make sure you dont take the notes IN. :)
and i have NO clue how competitive CA is.... but for Texas, no its not enough... maybe for the first 2 invites, but our proctors are really good at incorporating LOTS of chemistry. START with the wiki, because if you don't know that then.... Whew- good luck. (i like the virginia piqua regional test...) then just start looking at things that you can pull from the observations, dig deeper and have fun!!!
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Re: Can't Judge a Powder B

Postby hpfananu » December 22nd, 2010, 3:49 pm

If your school went to invitationals last year or you know someone who did, try and get tests because purplepeopleeater and I have found that the best way to learn what more you can add is just by doing tests and going back and doing more tests. Also, just curious, what kind of pH paper do you guys usually use?
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Re: Can't Judge a Powder B

Postby JSGandora » January 20th, 2011, 2:54 pm

It looks like I'm doing this event for states. I'm new to this event, can anyone tell me where's a good place to start practicing? All help is greatly appreciated. :)


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