Crime Busters B

[pikachu4919]

Crime Busters B: Given a scenario, a collection of evidence, and possible suspects, students will perform a series of tests that along with other evidence will be used to solve a crime.

Crime Busters Wiki

Recommended Lab Equipment List for Div. B

Past Threads: 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020

Past Question Marathons: 2015, 2016, 2017, 2018, 2019, 2020

[Crimesolver]

Here's a website I created to simulate lab for crime busters!- https://crimebusters-simulator.netlify.app/

[Crimesolver]

Here's a website I created to simulate lab for crime busters!- https://crimebusters-simulator.netlify.app/

This is really cool and useful and I know this will be helpful to many teams, including ours. Thank you!

[Crimesolver]

Here's a website I created to simulate lab for crime busters!- https://crimebusters-simulator.netlify.app/

This is amazing! I'm being super nitpicky but the iodine sample should turn clear with Vit C (although I believe it's the only acid on the list so pH should be enough to ID anyway).

[Crimesolver]

This is amazing! I'm being super nitpicky but the iodine sample should turn clear with Vit C (although I believe it's the only acid on the list so pH should be enough to ID anyway).

I got that fixed! I totally forgot to include that, so thanks for letting me know!

[sneepity]

A note for test writers going by the MiniSO model: some Crime Busters powders can only be identified by appearance. If you choose to not provide pictures or a description of the powder, please make sure the powders you chose can be uniquely identified from the test results you provide. For example, salt and sugar don't react to anything and have the same pH and can only be identified by crystal shape. Cornstarch and flour both turn purple/black in iodine but have distinct appearances and textures.

Be careful with using pH to ID, as a lot of powders are very close to neutral and deviations are usually specific to the sample used (for example, the wiki says sand has a pH of 6, but it could be 7 or 8 depending on where the sand is from and what other compounds are in it). Additionally, pH is dependent on concentration, so if your ratio of sample to water is significantly different from what competitors are used to, you will get different pHs.

[sneepity]

Here's a website I created to simulate lab for crime busters!- https://crimebusters-simulator.netlify.app/

I absolutely love how simple, yet adorable this is! The illustrations are cute, and it runs very smoothly (esp the fizzing gif). Most importantly, I like the accurate information and details. I say this has a lot of potential, and you can expand on the website! (more categories instead of only powders) Thank you so much for creating it! :)))) I'll definitely use this for practice.
edits: spelling

[stenopushispidus]

Does anyone know which crime busters tests from invitationals (2019-2021) have information/descriptions on powders, liquids, and metals rather than having in person chemicals?

[CPScienceDude]

Does anyone know which crime busters tests from invitationals (2019-2021) have information/descriptions on powders, liquids, and metals rather than having in person chemicals?

I’m not sure, but honestly as long as you can ID the unknown by test results, that should be enough to do well on a dry lab. I’d suggest adding common uses and unique properties of each chemical to your sheet if you don’t have them already. I can look when I get home and I’ll edit this post if I find any.

[diyam]

Does anyone know which crime busters tests from invitationals (2019-2021) have information/descriptions on powders, liquids, and metals rather than having in person chemicals?

Hey! Most tests do not have the description, and this is something we struggled with as well.
Our team coach however, gathered tests from invitationals we did not attend from this year, and we practiced using those.
If all else fails, you can ask your event coach to do the meticulous job of transcribing the test key into a description

ie. if the answer to evidence 3 was Vitamin C, your event coach would modify the question so that instead of asking what powder it is, the question would ask about which powder is white and turns iodine clear? (of course much more detail can be added, so make sure to provide your coach with a table such as this one: https://lwsd-my.sharepoint.com/:w:/g/pe ... Q?e=dEmJAr (this is just a compiled copy pasted document that I made. The password is CrimeBusters2021)

I hope this helps! Please let me know if anything I said was confusing, because it was worded a little odd