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Re: Can't Judge a Powder B

Posted: February 24th, 2011, 1:50 pm
by robotman
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

Re: Can't Judge a Powder B

Posted: February 28th, 2011, 1:45 pm
by geekychic13
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)

Re: Can't Judge a Powder B

Posted: February 28th, 2011, 2:17 pm
by geekychic13
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
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!

Re: Can't Judge a Powder B

Posted: February 28th, 2011, 2:18 pm
by geekychic13
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)
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."

Re: Can't Judge a Powder B

Posted: February 28th, 2011, 2:33 pm
by robotman
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
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
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

Re: Can't Judge a Powder B

Posted: February 28th, 2011, 3:41 pm
by geekychic13
when a powder is dissolved in H2O, that means its soluble
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 !

Re: Can't Judge a Powder B

Posted: March 1st, 2011, 4:09 pm
by geekychic13
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 :D

Re: Can't Judge a Powder B

Posted: March 1st, 2011, 4:54 pm
by rockernerdzgurl
:o :o :o i just got forced into this event,I am in Crime Busters,I don't really know what to do. SOMEONE PLEASE HELP!!

Re: Can't Judge a Powder B

Posted: March 1st, 2011, 6:53 pm
by robotman
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]

Re: Can't Judge a Powder B

Posted: March 2nd, 2011, 1:03 pm
by geekychic13
actually, it would be fine because all regionals allow you to bring things on the official soinc list. :D
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
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
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