Materials Science C

RAntonello
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Re: Materials Science C

Postby RAntonello » March 22nd, 2013, 11:02 am

andrewwski wrote:I'm on vacation through the weekend. Not sure if the test is on my laptop (which is with me) or my external hard drive (which isn't). I'll take a look tomorrow.

Anything? It would be amazing if we could get some kind of test up shortly.

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Re: Materials Science C

Postby andrewwski » March 22nd, 2013, 1:01 pm

Sorry - keep forgetting! I'll upload it when I get home tonight.
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Re: Materials Science C

Postby RAntonello » March 22nd, 2013, 7:40 pm

Not to be pushy, but it would be really great if you could get it up ASAP. States are tomorrow. :mrgreen:

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Re: Materials Science C

Postby googlyfrog » April 9th, 2013, 1:30 pm

Is it on the test exchange yet? I'm not sure if it's just my computer acting weird.

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Re: Materials Science C

Postby andrewwski » April 11th, 2013, 9:54 pm

It's there now.
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Briscon
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Re: Materials Science C

Postby Briscon » April 12th, 2013, 9:14 am

andrewwski wrote:It's there now.

There is a mistake on your answer key. For question 10, you are supposed to list materials in order of increasing Young's modulus. However, the answer key has "rubber" twice instead of having "diamond" in its proper spot.
Everything else looks good though! Thanks for the test, it was very well done, not too easy yet not too hard, and just in time too. My state competition is tomorrow.

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Re: Materials Science C

Postby andrewwski » April 12th, 2013, 12:25 pm

Ah yeah, forgot to correct that. We corrected it on the paper copies we used for grading, but I never fixed the document. I'll put up a corrected version at some point.

As a basis of comparison, the average for the test was right around 50. The high score I believe was 82, and the low 21.
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Re: Materials Science C

Postby earthbot25 » April 29th, 2013, 4:12 pm

Does anyone know who the nats supervisor for this is going to be? I'm just curious.
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Re: Materials Science C

Postby earthbot25 » April 30th, 2013, 1:34 pm

Also, since most states have happened, did anyone have any labs at states? PA had a test based on stress and strain with testing the deformation of fishing line by adding weights to it.
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Re: Materials Science C

Postby Briscon » May 1st, 2013, 7:42 am

WA had a lab on contact angles. We got four different surfaces, and had to compare the contact angle between them, draw the drop etc. We also had to model one of the crystal structures (each team got a different one).

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Re: Materials Science C

Postby RAntonello » May 2nd, 2013, 2:09 pm

Could anyone explain how one might determine the packing structure of a particular material (i.e. FCC, BCC)? The question is asked several times in the Clio Invitational test that was posted a while back and there are no explanations given.

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Re: Materials Science C

Postby Briscon » May 2nd, 2013, 7:55 pm

RAntonello wrote:Could anyone explain how one might determine the packing structure of a particular material (i.e. FCC, BCC)? The question is asked several times in the Clio Invitational test that was posted a while back and there are no explanations given.


Unfortunately, that one is something that you sort of have to just know. There isn't really a way to determine it as far as I know from just the name, it is mostly an intuitive sense. You should study crystal structures of common materials as well as the most typical crystal structure for each class of materials in order to have the best idea as to the crystal structure of a given material. In my experience, FCC is the most common structure for a wide range of materials. However, it does vary even for the same material. Iron, for example, can exist as BCC (delta, beta, and alpha iron), FCC (gamma iron), and HCP (Epsilon iron)

To andrewwski:
Can you explain what exactly the prefixes s- and p- on number 15 mean? My partner and I couldn't figure out what exactly you meant by it. Our first guess was sigma and pi bonds, but that would mean the answer would be s-sp3. Our second guess was it had to do with the p orbitals of the CL atoms. Could you clarify what exactly the prefix of the answer means (we understand the sp3 part).

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Re: Materials Science C

Postby andrewwski » May 6th, 2013, 1:29 pm

Correct, the sp3 hybridized orbitals of Carbon bond with the p orbitals of Chlorine. Carbon is normally 2s2 2p2, it hybridizes to get 4 sp3 orbitals. Chlorine is 3s2 3p5 - it seeks one additional electron in the p-orbital. So each one of the sp3 orbitals of Carbon bonds with a p orbital of Chlorine.
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Re: Materials Science C

Postby cjingk96 » June 4th, 2013, 6:26 pm

Briscon wrote:WA had a lab on contact angles. We got four different surfaces, and had to compare the contact angle between them, draw the drop etc. We also had to model one of the crystal structures (each team got a different one).


In your lab, did you have to quantitatively measure the contact angles or just compare them? If you did have to get quantitative data, how did you do it? I have no idea what I'd do if I got a lab like that :o

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Re: Materials Science C

Postby Infinity Flat » June 5th, 2013, 8:50 am

cjingk96 wrote:
Briscon wrote:WA had a lab on contact angles. We got four different surfaces, and had to compare the contact angle between them, draw the drop etc. We also had to model one of the crystal structures (each team got a different one).


In your lab, did you have to quantitatively measure the contact angles or just compare them? If you did have to get quantitative data, how did you do it? I have no idea what I'd do if I got a lab like that :o

It was just comparative IIRC.
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