Can't Judge a Powder B

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Can't Judge a Powder B

Postby Jim_R » August 10th, 2014, 10:46 am

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Can't Judge a Powder

Postby Kahler » November 6th, 2014, 4:00 pm

I don't know how to find the density of a powder. Can anyone help me?

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Re: Can't Judge a Powder

Postby asthedeer » November 7th, 2014, 3:39 pm

I don't know how to find the density of a powder. Can anyone help me?

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The density of a powder is mass/volume. So far in the event (I did this event last year too), I haven't actually had to find the density of anything. Just be ready to answer questions about relative density, such as "Is the powder more dense/less dense than ____ (name of reagent)?" In that case, you could stick in as an answer something like- "Observation ##: The powder sinks in/floats in ____ (same name of reagent) , therefore, the powder is more dense/less dense than ____(reagent)"

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Re: Can't Judge a Powder

Postby cupcakegirl » November 11th, 2014, 7:32 am

I don't know how to find the density of a powder. Can anyone help me?

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If they give you a balance and a graduated cylinder, then you can find it. This explains it nicely:
http://www.newton.dep.anl.gov/askasci/c ... m03532.htm
It's a pretty rare question (like asthedeer said), but I have seen it before. Good luck!
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Re: Can't Judge a Powder

Postby samlan16 » November 13th, 2014, 11:58 am

I don't know how to find the density of a powder. Can anyone help me?

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Basically you need to start by taking the mass of the sample. I recommend taking the mass of the sample and the container first, then pouring it into a different container to mass the original container. You can subtract the two to get the mass of the sample, and that counts as another observation. (WARNING: Do not only give the mass of the sample. That is an inference.) Then, find the volume of the sample by measuring the volume in a beaker. As another observation, divide the mass by the volume. I recommend rounding to 2 decimal places. The SI unit is g/cm^3 or g/mL. Be certain that this is how you measure everything.
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Re: Can't Judge a Powder

Postby asthedeer » November 15th, 2014, 5:35 pm

I don't know how to find the density of a powder. Can anyone help me?

(This post was moved to the Can't Judge a Powder event forum - Mod)
If they give you a balance and a graduated cylinder, then you can find it. This explains it nicely:
http://www.newton.dep.anl.gov/askasci/c ... m03532.htm
It's a pretty rare question (like asthedeer said), but I have seen it before. Good luck!
Unless I'm mistaken, you aren't allowed to bring graduated cylinders in competitions tho....
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Re: Can't Judge a Powder B

Postby Moxyfinkle » November 27th, 2014, 8:14 am

Unless I'm mistaken, you aren't allowed to bring graduated cylinders in competitions tho....
She means if they give you a graduated cylinder. You're right, you can't bring one yourself, which is why it's not always asked about.

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Re: Can't Judge a Powder B

Postby asthedeer » November 27th, 2014, 9:22 am

Ah I see. :P I didn't notice the "if they give" part. :D
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Re: Can't Judge a Powder B

Postby Boombloxer2 » December 2nd, 2014, 2:33 pm

Ah I see. :P I didn't notice the "if they give" part. :D
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Re: Can't Judge a Powder B

Postby Madian » December 15th, 2014, 7:13 pm

Hello, I was just wondering if any of you had any specific suggestions on how to make observations. Also, should we keep referring back to the solution on every observation after or not?
Thanks!


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