## Can't Judge a Powder B

Jim_R
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### Can't Judge a Powder B

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Kahler
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### Can't Judge a Powder

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

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asthedeer
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### Re: Can't Judge a Powder

Kahler wrote: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)
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

Kahler wrote: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:
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

Kahler wrote: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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asthedeer
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### Re: Can't Judge a Powder

cupcakegirl wrote:
Kahler wrote: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:
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

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.

asthedeer
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### Re: Can't Judge a Powder B

Ah I see. I didn't notice the "if they give" part.
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Boombloxer2
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### Re: Can't Judge a Powder B

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

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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