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by wec01
Yesterday, 7:40 pm
Forum: Question Marathons
Topic: Forensics C
Replies: 33
Views: 1960

Re: Forensics C

Since nothing's happening, might as well... 1. Which powders precipitate with NaOH? 2. A piece of glass disappears in a solution with refractive index 1.53. What is the glass' refractive index? 3. What is a base peak in mass spectrometry? Answers: 1. MgSO4 and Ca(NO3)2 2. 1.53 3. The highest peak i...
by wec01
Yesterday, 7:32 pm
Forum: Question Marathons
Topic: Fossils B/C
Replies: 39
Views: 2116

Re: Fossils B/C

Specimen A: https://media.sketchfab.com/models/484e60a55dd442c7a998c7c66b7cb182/thumbnails/3c9eebc07a3540d8b1104f391f797e58/fa9a7cc744e04f3f89cb95311ba1cf3c.jpeg Specimen B: https://i.ebayimg.com/images/g/AigAAOSwC6xbRGcf/s-l300.jpg 1. Identify specimen A. 2. What structure does specimen A hunt wit...
by wec01
January 1st, 2020, 8:07 am
Forum: Study Events
Topic: Fossils B/C
Replies: 73
Views: 8062

Re: Fossils B/C

What did you guys research and put in your binder for adaptations and morphological features of major fossils groups. Did you guys put pictures of brachiopods, bivalves , and etc. or did you write a description. Also how in depth did you go for fossils as evidence for evolutionary trends and for ma...
by wec01
December 18th, 2019, 11:15 am
Forum: Lab Events
Topic: Forensics C
Replies: 23
Views: 2477

Re: Forensics C

I was wondering: suggestions for splitting the work during the competition? I'm thinking about a lab/test split carried over from Crime Busters, but I'm worried I'm not doing enough work that way... I think having each partner deal with a few types of samples and any related questions (e.g. one doe...
by wec01
December 18th, 2019, 11:08 am
Forum: Lab Events
Topic: Crime Busters B
Replies: 19
Views: 2666

Re: Crime Busters B

I think my coach told us the day before our invitationals that they wanted to make clarification on the rules. I think you're only allowed one sheet of paper, not two. The same wording was used for forensics last year and 2 sheets were allowed at competition, so most likely that’s what they intended.
by wec01
December 12th, 2019, 1:13 pm
Forum: Lab Events
Topic: Sounds of Music C
Replies: 30
Views: 3599

Re: Sounds of Music C

This year my partner and I a slidable drum type thing, sort of like a drum and trombone combined. It registered all of the pitches quite well and we were able to place 1st at states with it :D (In MT obviously so maybe not the toughest competition)
Congrats! That sounds like a cool instrument.
by wec01
December 10th, 2019, 2:48 pm
Forum: Lab Events
Topic: Forensics C
Replies: 23
Views: 2477

Re: Forensics C

I was wondering how in-depth I should go when it comes to the powders/crystals. I assume I have to know how they react with different chemicals, the flame tests, what they can be found in, and their chemical formulas. How far should I go after that? Is there anything specific I should know about th...
by wec01
November 28th, 2019, 6:07 pm
Forum: Lab Events
Topic: Crime Busters B
Replies: 19
Views: 2666

Re: Crime Busters B

I've been having trouble finding the reactions of the white powders and potassium iodide. I really have no way to test them out myself, so can someone help me out? Iodine is mainly for cornstarch, which will very distinctively turn a dark blue/black, and to distinguish between sodium carbonate and ...
by wec01
November 22nd, 2019, 2:41 pm
Forum: Study Events
Topic: Fossils B/C
Replies: 73
Views: 8062

Re:

Hi uh how do you differentiate between genus astarte and genus glycymeris?? thnx It looks like there’s a subtle difference in the shape around the umbo and hinge. Astarte has a sharper umbo and curves slightly while glycymeris has a rounder umbo and is more symmetrical around the umbo and hinge. No...
by wec01
November 4th, 2019, 11:44 am
Forum: Lab Events
Topic: Forensics C
Replies: 23
Views: 2477

Re: Plastics and Fibers

Are there any online stores where my school can buy plastic and fiber samples?
I think the North Carolina Scioly website has some. They are frequently out of stock though.
You can also start collecting your own samples from old clothes and plastic containers.

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