Science Crime Busters B

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Science Crime Busters B

Postby Jim_R » July 2nd, 2011, 8:06 pm

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Re: Science Crime Busters B

Postby prelude to death » September 23rd, 2011, 5:15 pm

Anyone with the rules already: Are the rules/materials much different from last year? Additionally, is Water Testing back, or is it still polymers and fibers?
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Re: Science Crime Busters B

Postby chalker » September 23rd, 2011, 6:24 pm

prelude to death wrote:Anyone with the rules already: Are the rules/materials much different from last year? Additionally, is Water Testing back, or is it still polymers and fibers?



There are only minor changes. It's still polymers and fibers.

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Re: Science Crime Busters B

Postby geekychic13 » September 27th, 2011, 1:36 pm

I think that one of the major changes i noticed was that we dont use NaOH this year, we use iodine....but thats all i noticed....:)
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Re: Science Crime Busters B

Postby Sherry Berry » October 7th, 2011, 1:39 pm

I did this event two years ago for the team tryouts, and I was not very good at it. It was mostly because I had no idea what tests they wanted me to do, so does anyone know like a website where they tell you what the tests are, or are they on the rules manual and I just somehow missed them?
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Re: Science Crime Busters B

Postby DigiDuncan » October 27th, 2011, 9:07 am

It's EXACTLY like last year. I was hoping for water testing, but, sadly, no sign of it as of yet.
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Re: Science Crime Busters B

Postby CopperPenny » November 8th, 2011, 6:23 pm

This was my favorite event last year, when I was in sixth grade. I hope I get on it dearly, as I did only decent on the test and am eighth for picking events.

What was water testing?
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Re: Science Crime Busters B

Postby zazzy7 » November 13th, 2011, 7:13 pm

I'm doing CB this year, but the guidelines are pretty vague and my partner have no clue of where to start in preparing. I know we have to study, but don't know what to study. Any tips?

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Re: Science Crime Busters B

Postby Saturiea » November 13th, 2011, 8:00 pm

There are a lot of things to learn. Based of past experience a majority of the test is ID of the powders and mixtures. So my suggestion is to talk to your coach about getting the needed powders and then start practicing how you can ID them. Maybe make a dichotomous key

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Re: Science Crime Busters B

Postby prelude to death » November 17th, 2011, 10:22 pm

Saturiea wrote:There are a lot of things to learn. Based of past experience a majority of the test is ID of the powders and mixtures. So my suggestion is to talk to your coach about getting the needed powders and then start practicing how you can ID them. Maybe make a dichotomous key

I strongly agree. The majority of the test will in fact be powders, but you might also want to take a look at liquids and metals too, since the liquids are commonly found lying around the house, and you might have better access to them. Once you feel like you got the hang of recognizing individual powders, then you should start moving onto mixtures of 2, then 3 if you feel braver. However, the event isn't just identification. You'll have to know things like types of fingerprints (which is pretty basic), as well as what certain types of fibers and hairs look like under microscopes. Those are the most common things seen in the competition setting, and should be enough to get you started. Also, you might want to take a lot of practice tests with your partner - find out who is better at doing what. For example, my partner and I have worked out a system that allows us to use our 50 minutes of event time the most efficiently. You can either split up the work or work together, although I do recommend from previous experience to split up the work because the time you have is limited.
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Re: Science Crime Busters B

Postby Skink » November 18th, 2011, 5:31 am

Majority? Keep in mind, as far as scoring is concerned, unknown ID--mostly powders--is 50%. That's a 50% you can't afford to lose, but don't skip practicing everything else, either.

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Re: Science Crime Busters B

Postby geminicross » December 12th, 2011, 12:50 pm

prelude to death wrote:
Saturiea wrote:There are a lot of things to learn. Based of past experience a majority of the test is ID of the powders and mixtures. So my suggestion is to talk to your coach about getting the needed powders and then start practicing how you can ID them. Maybe make a dichotomous key

I strongly agree. The majority of the test will in fact be powders, but you might also want to take a look at liquids and metals too, since the liquids are commonly found lying around the house, and you might have better access to them. Once you feel like you got the hang of recognizing individual powders, then you should start moving onto mixtures of 2, then 3 if you feel braver. However, the event isn't just identification. You'll have to know things like types of fingerprints (which is pretty basic), as well as what certain types of fibers and hairs look like under microscopes. Those are the most common things seen in the competition setting, and should be enough to get you started. Also, you might want to take a lot of practice tests with your partner - find out who is better at doing what. For example, my partner and I have worked out a system that allows us to use our 50 minutes of event time the most efficiently. You can either split up the work or work together, although I do recommend from previous experience to split up the work because the time you have is limited.

Do you have any info on analyzing blood spatters?

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Re: Science Crime Busters B

Postby AlphaTauri » December 13th, 2011, 7:53 pm

http://en.wikipedia.org/wiki/Bloodstain ... n_analysis

Before asking for help, I would highly suggest running a simple google/bing/whatever-search-engine-floats-your-boat search on any topic you want to know about for SCB. Most of my notes for Forensics come from a simple google/wikipedia search (and the 2-inch thick pile of notes I inherited from former competitors, which is mostly wikipedia anyways).
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Re: Science Crime Busters B

Postby outofsight13 » December 19th, 2011, 11:34 am

Will we have to construct and bring a paper chromatogram, for testing, to the competition? Or do we just have to know what they are and how they work?

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Re: Science Crime Busters B

Postby Skink » December 19th, 2011, 2:28 pm

You will have to go to competition and make a chromatogram. The supervisor will provide the materials, but know how to do it. It's easy points lost, otherwise.


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