Crime Busters B

starfruit
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Re: Crime Busters B

Postby starfruit » December 15th, 2018, 4:14 am

mustardsammich wrote:Which should I study harder, blood stains or ph?


I would study ph levels much harder, because they can apply to identifying both liquids and powders. Blood spatters are fine if you have a basic understanding, but you don't need to spend much of your time studying them.
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Re: Crime Busters B

Postby bigfatcat24 » December 15th, 2018, 8:38 am

:P hi i was wondering if they are testing powders in the first competition and if so what powders?

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Re: Crime Busters B

Postby starfruit » December 16th, 2018, 6:28 am

bigfatcat24 wrote::P hi i was wondering if they are testing powders in the first competition and if so what powders?


Yes, they have always had powders when I've competed, and the powders can be any of the 13 powders in the rules. You won't know what they are until you test and identify them.
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Re: Crime Busters B

Postby builder83 » December 16th, 2018, 10:13 am

1. Will hair samples be given on a slide? Or will we have to put them on a slide?

2. Chromatography: After running a test with juice or ink, what next? Will they be compared against given tests?

3. Mixed substances. Is there a good resource on how to determine these?

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Re: Crime Busters B

Postby amk578 » December 16th, 2018, 11:22 am

builder83 wrote:1. Will hair samples be given on a slide? Or will we have to put them on a slide?

2. Chromatography: After running a test with juice or ink, what next? Will they be compared against given tests?

3. Mixed substances. Is there a good resource on how to determine these?


1. Sometimes they will be given on a slide, but I've seen in the past where they require you to put it on slides with the slip covers (not sure if they changed the rules).

2. They will most likely provide given tests to compare against. Another thing that may be asked of you is the retention factor of the chromatography.

3. I believe mixtures will show qualities of both substances in there (if that makes sense), but I'm not sure about a finite resource for researching this. The best thing to do would be doing practice tests on identifying with kits.
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Re: Crime Busters B

Postby builder83 » December 16th, 2018, 1:22 pm

amk578 wrote:
builder83 wrote:1. Will hair samples be given on a slide? Or will we have to put them on a slide?

2. Chromatography: After running a test with juice or ink, what next? Will they be compared against given tests?

3. Mixed substances. Is there a good resource on how to determine these?


1. Sometimes they will be given on a slide, but I've seen in the past where they require you to put it on slides with the slip covers (not sure if they changed the rules).

2. They will most likely provide given tests to compare against. Another thing that may be asked of you is the retention factor of the chromatography.

3. I believe mixtures will show qualities of both substances in there (if that makes sense), but I'm not sure about a finite resource for researching this. The best thing to do would be doing practice tests on identifying with kits.


Thanks for the quick response! I have the kit. I just did not know if there was a different way to figure out mixtures. We should be able to figure them out with ph, water, hcl, and iodine right? Guess I'll just mix some and see what happens!

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Re: Crime Busters B

Postby ledwards003 » January 2nd, 2019, 5:48 pm

I was wondering what liquids are typically used to test density, as I have been given the liquids before without knowing their density and would like to be able to figure that out. I cannot out what find the liquids used for testing density are anywhere, so if anyone could help I would really appreciate it. Thank you!

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Re: Crime Busters B

Postby Person » January 2nd, 2019, 6:07 pm

ledwards003 wrote:I was wondering what liquids are typically used to test density, as I have been given the liquids before without knowing their density and would like to be able to figure that out. I cannot out what find the liquids used for testing density are anywhere, so if anyone could help I would really appreciate it. Thank you!


Haven't done Crime Busters before, but the ones I had on my Forensics notes for density were corn oil, 46% isopropyl alcohol, and 10%/25%/saturated NaCl solution.
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Re: Crime Busters B

Postby scipanther55 » January 5th, 2019, 9:50 pm

Hey Guys,

Wondering if we are allowed to conduct a scratch test for metals?

Also,
Does anyone know what liquids they will provide when testing the density of plastics?

Thanks

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Re: Crime Busters B

Postby Galahad » January 6th, 2019, 2:03 am

scipanther55 wrote:Hey Guys,

Wondering if we are allowed to conduct a scratch test for metals?

Also,
Does anyone know what liquids they will provide when testing the density of plastics?

Thanks


The metals are usually given in vials in grains or very small beads, so I don't think you can conduct a scratch test. In my experience I've never had to do one, nor was able to.

As for the liquids, it usually varies between each proctor. But usually they'll stick to the common liquids: water, NaCl (Varying concentrations), 46% isopropyl alcohol, and vegetable oils.

It's always good to expand, but I don't think you'll need anything other than those I stated. You can distinguish all of the plastics with just those 4.
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Re: Crime Busters B

Postby Incineroar999 » January 7th, 2019, 12:33 pm

Hello. I'm a newbie and I have NO IDEA what I'm doing. Please give me any tips!!!

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Re: Crime Busters B

Postby CPScienceDude » January 7th, 2019, 12:40 pm

Incineroar999 wrote:Hello. I'm a newbie and I have NO IDEA what I'm doing. Please give me any tips!!!


Practice, practice, practice! Speed and accuracy is your goal! Practice identifying powers a lot. Get the powders, some test tubes, and ask a team mate to pour some of the powders into different test tubes. Make sure they remember what is in which test tube and that you don't see what they're doing. Try and identify the powers and see how you do. Also, a great resource page can make or break you. Make sure you have good diagrams to id powders, liquids, and metals. Make sure you also know how to id types of hair and fingerprints. Another important thing to get good at is matching footprints and tire tracks. Good luck!
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Re: Crime Busters B

Postby Tailsfan101 » January 8th, 2019, 2:22 pm

Incineroar999 wrote:Hello. I'm a newbie and I have NO IDEA what I'm doing. Please give me any tips!!!

Save plenty of time for the analysis (at least 20 minutes).
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Re: Crime Busters B

Postby Rivkaaa » January 9th, 2019, 5:54 am

I attended the Bayard Rustin invy on 01/05, and the proctors for CB included two crushed up metals as two powders. Is this allowed?
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Re: Crime Busters B

Postby CPScienceDude » January 9th, 2019, 9:47 am

Rivkaaa wrote:I attended the Bayard Rustin invy on 01/05, and the proctors for CB included two crushed up metals as two powders. Is this allowed?


No, the rules state,"Qualitative Analysis: Participants will identify evidence (unknowns) by performing tests such as solubility, acidity, magnetic property, color, density, and odor. Every team will have the same set of unknowns (evidence). The scenario will identify which containers hold mixtures and if the mixtures are made of two or three materials. The unknown common materials will be taken from the following lists.

i. Solids: Anhydrous sodium acetate, yeast, vitamin C (ascorbic acid), *calcium carbonate (powdered limestone), *table salt (NaCl), *sugar (crystal), *flour, *calcium sulfate 2H2O (gypsum), *cornstarch, *baking soda, *powdered gelatin, *powdered Alka-Seltzer®, *sand (white).

ii. Non-Powdered Metals: aluminum, iron, zinc, magnesium, copper, tin.

iii. Liquids: lemon juice, rubbing alcohol (isopropyl), household ammonia (3%), water, vinegar,
hydrogen peroxide (3%).

If the metals were powdered that would not follow the rules.
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