Can't Judge a Powder B

Post by **robotman** » Thu Feb 24, 2011 1:50 pm

Most of the times when running test the powder is an a beaker or medicinal type container that has ml increments if they are going to ask how much powder was given.
The best way to determine if you are allowed to bring it to a competion is to A submit a rule clarification since it isn't specifically mention and a Graduated cylinder isn't really used to test solubility and than Contact the Competion director just to make sure

geekychic13 · Post by **geekychic13** » Mon Feb 28, 2011 1:45 pm

Quick question: when you add a powder to H20, and the pH changes, does that mean that the powder is soluble in water? (or if the conductivity changes)

geekychic13 · Post by **geekychic13** » Mon Feb 28, 2011 2:17 pm

yes you are allowed to bring a gradulated cylinder to the event
me and my partner brought it to regionals, so you should be fine

kcmom wrote:Hello! I'm a mentor and I need a bit of help! Can we bring a graduated cylinder with us? We don't see that it is specifically mentioned, so we are afraid to bring it and get disqualified. However, we have noticed that some of the practice questions ask for the volume of the powder.

Would it be provided by the person running the event?

Thank you!

geekychic13 · Post by **geekychic13** » Mon Feb 28, 2011 2:18 pm

Actually, what I would say would be:
When the substance is placed in the NaOH, the solution formed a _____ (_____= whatever you want to call it)

JSGandora wrote:Which sentence(s) would be an observation or inference?

"Once placed in the NaOH, the powder formed a gel."

"Once placed in the NaOH, the powder formed a gel-like substance."

"Once placed in the NaOH, the powder formed an alloid."

Post by **robotman** » Mon Feb 28, 2011 2:33 pm

geekychic13 wrote:Quick question: when you add a powder to H20, and the pH changes, does htat mean that the powder is soluble in water? (or if the conductivity changes)

yes it would be soluble

geekychic13 wrote:yes you are allowed to bring a gradulated cylinder to the event
me and my partner brought it to regionals, so you should be fine
kcmom wrote:Hello! I'm a mentor and I need a bit of help! Can we bring a graduated cylinder with us? We don't see that it is specifically mentioned, so we are afraid to bring it and get disqualified. However, we have noticed that some of the practice questions ask for the volume of the powder.

Would it be provided by the person running the event?

Thank you!

Never assume that all regionals are run the same (they aren't) hence the reason contacting the regional CJAP proctor would be a good idea just to double check

lastly please try not to post three times in a row if you need to add info and no one else has posted use the edit button in the corner of the post

geekychic13 · Post by **geekychic13** » Mon Feb 28, 2011 3:41 pm

when a powder is dissolved in H2O, that means its soluble

DanielleS wrote:Hi, this is going to seem like kind of a stupid question, but I'm a little confused. When a powder is dissolved in water, and there is a color change or the clearness of the water changes (transparent to translucent or opaque) is the powder soluble in water? For some reason, I am having a lot of trouble with solubility and Google isn't helping me too much. Thanks !

geekychic13 · Post by **geekychic13** » Tue Mar 01, 2011 4:09 pm

robotman09 wrote:
HappySciencePie wrote:
karatekid44 wrote:Also when taking the test, or when practicing, use the name of the test liquid that is given such as H20. Almost all of the judges will dock points for not using the scientific formula.
Oh, I never knew that. Thanks for sharing. c:
Most of the time it's easier to just write the formula anyway, so it's not like it's a hassle. :3
Just Make sure you don't write the wrong formula than you would have problems

okay so maybe i shouldn't be reading other people's posts but I didn't know that and thank you even though ur question/answer was in no way directed to me

rockernerdzgurl · Post by **rockernerdzgurl** » Tue Mar 01, 2011 4:54 pm

i just got forced into this event,I am in Crime Busters,I don't really know what to do. SOMEONE PLEASE HELP!!

Post by **robotman** » Tue Mar 01, 2011 6:53 pm

Read through this thread it has a large amount of good info, also read the rules and the [wiki]Can't Judge A Powder[/wiki]

geekychic13 · Post by **geekychic13** » Wed Mar 02, 2011 1:03 pm

actually, it would be fine because all regionals allow you to bring things on the official soinc list.

robotman09 wrote:
geekychic13 wrote:Quick question: when you add a powder to H20, and the pH changes, does that mean that the powder is soluble in water? (or if the conductivity changes)
yes it would be soluble
geekychic13 wrote:yes you are allowed to bring a gradulated cylinder to the event
me and my partner brought it to regionals, so you should be fine
kcmom wrote:Hello! I'm a mentor and I need a bit of help! Can we bring a graduated cylinder with us? We don't see that it is specifically mentioned, so we are afraid to bring it and get disqualified. However, we have noticed that some of the practice questions ask for the volume of the powder.

Would it be provided by the person running the event?

Thank you!
Never assume that all regionals are run the same (they aren't) hence the reason contacting the regional CJAP proctor would be a good idea just to double check

lastly please try not to post three times in a row if you need to add info and no one else has posted use the edit button in the corner of the post

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