Search found 249 matches

by wec01
January 28th, 2020, 7:56 am
Forum: Question Marathons
Topic: Fossils B/C
Replies: 97
Views: 6638

Re: Fossils B/C

1. What does a “coal gap” in the fossil record following the Permian extinction suggest? 2. Why did “meandering” streams change to “braided” streams after the Permian extinction? 3. What organism temporarily replaced reefs after the Permian extinction? 1. The Coal gap in the fossil record suggest a...
by wec01
January 22nd, 2020, 6:27 pm
Forum: Question Marathons
Topic: Fossils B/C
Replies: 97
Views: 6638

Re: Fossils B/C

1. What does a “coal gap” in the fossil record following the Permian extinction suggest?
2. Why did “meandering” streams change to “braided” streams after the Permian extinction?
3. What organism temporarily replaced reefs after the Permian extinction?
by wec01
January 21st, 2020, 5:19 am
Forum: Question Marathons
Topic: Forensics C
Replies: 69
Views: 4987

Re: Forensics C

1. Write the reaction between calcium carbonate and muriatic acid. 2. What are the first insects to arrive on a dead body? 3. You are given the mass spectra of pentane. What fragment does the peak at m/z=29 represent. 1. CaCO3(s)+2HCl(aq)-->CO2(g)+H2O(l)+CaCl2(aq) 2. blowflies 3. C2H5+ Yep, your tu...
by wec01
January 19th, 2020, 8:15 pm
Forum: Question Marathons
Topic: Forensics C
Replies: 69
Views: 4987

Re: Forensics C

1. Write the reaction between calcium carbonate and muriatic acid.
2. What are the first insects to arrive on a dead body?
3. You are given the mass spectra of pentane. What fragment does the peak at m/z=29 represent.
by wec01
January 18th, 2020, 7:40 pm
Forum: Question Marathons
Topic: Forensics C
Replies: 69
Views: 4987

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
January 18th, 2020, 7:32 pm
Forum: Question Marathons
Topic: Fossils B/C
Replies: 97
Views: 6638

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: 216
Views: 19740

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: 80
Views: 8055

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: 42
Views: 5189

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: 81
Views: 8412

Re: Sounds of Music C

Doctheduck wrote:
December 12th, 2019, 12:40 pm
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.

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