Crime Busters B

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Crime Busters B

Postby bernard » Fri Jun 17, 2016 5:00 am


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Re: Crime Busters B

Postby drcubbin » Sun Nov 27, 2016 12:23 am

Are we using Logol's for the KI Solution?

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Re: Crime Busters B

Postby Unome » Sun Nov 27, 2016 2:19 am

drcubbin wrote:Are we using Logol's for the KI Solution?

To the best of my knowledge, the KI solution mentioned in the rules is Lugol's solution.

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Re: Crime Busters B

Postby drcubbin » Sun Nov 27, 2016 4:06 pm

Much appreciated!

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Re: Crime Busters B (Zinc Reaction in HCl and iodine)

Postby biojameskim2002 » Tue Jan 03, 2017 5:42 am

Hi all,

I was just wondering how zinc reacts in HCl and iodine. After research online, i found there is a lot of fizz when mixed with HCl, but when I tried that with my own personal tools, there seems to be little to no reaction. What may be the problem in this situation?

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Re: Crime Busters B (Zinc Reaction in HCl and iodine)

Postby SenseiSushi » Tue Jan 03, 2017 7:14 am

biojameskim2002 wrote:Hi all,

I was just wondering how zinc reacts in HCl and iodine. After research online, i found there is a lot of fizz when mixed with HCl, but when I tried that with my own personal tools, there seems to be little to no reaction. What may be the problem in this situation?


Zinc should react with HCl, but oftentimes this reaction is delayed or does not show up clearly as the HCl provided in competitions is diluted. I don't believe iodine is typically used to identify metals.

Color is usually my go-to when identifying zinc as it has a shiny silver color.
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Re: Crime Busters B

Postby Neharaval » Thu Jan 05, 2017 11:59 pm

I was wondering if we need to bring all powders and fibers or metals
which has to be tested or they will provide it.

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Re: Crime Busters B

Postby Panda Weasley » Fri Jan 06, 2017 12:51 am

Neharaval wrote:I was wondering if we need to bring all powders and fibers or metals which has to be tested or they will provide it.

The event supervisor will provide all of the unknown materials to be provided. The only things you need to bring are listed in the rules.
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Re: Crime Busters B

Postby abriddle » Sat Jan 14, 2017 4:27 pm

Hello- This is the first year I will be participating and was wondering where I can buy a practice kit that would contain everything needed? Thanks

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Re: Crime Busters B

Postby egbertghost » Sat Jan 14, 2017 5:17 pm

abriddle wrote:Hello- This is the first year I will be participating and was wondering where I can buy a practice kit that would contain everything needed? Thanks

You can buy a kit with pretty much everything here https://www.wardsci.com/store/catalog/p ... 470222-058
The only downside is that it is pretty expensive oTL
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Re: Crime Busters B

Postby Panda Weasley » Sat Jan 14, 2017 5:41 pm

abriddle wrote:Hello- This is the first year I will be participating and was wondering where I can buy a practice kit that would contain everything needed? Thanks

You can buy practice kits online, but they can be pricey. If your school has had a team before they probably already have everything you need.
If not, and buying a kit is a problem, talk to a science teacher about borrowing supplies from them. They won't have everything you need, but it will cut down costs. In terms of the powders, fibers, polymers, etc. you can often find cheap sources online separate from kits. For fibers- craft stores often will give you a small sample for free or very cheap. Just make sure the fabric you are getting is 100% of the material you want.

Hope this helped!
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Re: Crime Busters B

Postby abriddle » Mon Feb 06, 2017 10:32 pm

What is the best way to prepare for crime busters?

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Re: Crime Busters B

Postby 23aeg01 » Tue Feb 07, 2017 9:30 pm

[highlight] I was wondering if anybody could give me some tips on how to tell if during powder analysis, which powders are mixtures.

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Re: Crime Busters B

Postby ngangal » Wed Feb 08, 2017 7:43 pm

This is our first time @ Science Oly so appreciate some guidance. What is the recommended answer for different fingerprint types? Are Loops should be further categorized as ulnar or radial? Same thing for fiber? Plant, Animal, Synthetic or should we further identify them as cotton, silk, wool, etc...

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Re: Crime Busters B

Postby Panda Weasley » Wed Feb 08, 2017 9:01 pm

23aeg01 wrote:[highlight] I was wondering if anybody could give me some tips on how to tell if during powder analysis, which powders are mixtures.

I'd like to be able to help you with this, but I never did mixtures.

ngangal wrote:This is our first time @ Science Oly so appreciate some guidance. What is the recommended answer for different fingerprint types? Are Loops should be further categorized as ulnar or radial? Same thing for fiber? Plant, Animal, Synthetic or should we further identify them as cotton, silk, wool, etc...

The question should specify. Different tests will want different levels of specificity.
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