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Same. I put basic stuff also. In addition I added many flow charts of information needed to be known through the rules. I also added more specific details of topics in which I did not study as much. I continued adding until there was no room left. You never want unused space on a cheat sheet.

Of course, this year you can go really in depth with it all since you get so much space

Does anyone have suggestions for identifying plastics?

I know they mentioned vegetable oil and 10%/25% NaCl solution, but the rules don't explicitly state we're allowed to bring them.

No, but the ES will provide them if they're needed. I've only been to one contest that didn't provide them, and in all honesty I don't think that contest was run as it could have been.

iwonder wrote:No, but the ES will provide them if they're needed. I've only been to one contest that didn't provide them, and in all honesty I don't think that contest was run as it could have been.

Ah.
Thanks!

There are three ways that I know of. You can be given the solutions or like ones as noted. That's easy. You can be given different reagents for the purposes of testing these; there are flow charts out there that you can follow. Lastly, you can be given nothing. You can ID plastics by a sink/float test to narrow them down to three and physical characteristics reliably-ish.

I've actually encountered tests where they just gave you all the info on a sheet (Density, flame test, other properties) and told you identify. You can luck out there.

Another way (which I don't exactly recommend, but might come in handy) is identifying by what it looks like. Often times, these plastics come from pre-packaged forensics sets. I remember one test, the plastic samples used were identical in size and shape to samples we had back at home, and so we were able to identify via that route. I would caution against relying on this of course, because you're not always guaranteed to be this lucky. But it is nice to be familiar with what the plastic samples do look like.

How do you perform a co2 test for powders?

csattom wrote:How do you perform a co2 test for powders?

Don't really know what you mean by CO2 test specifically for powders. As far as I know, I've never come across such a test.

On the flow chart to test for powders that we have it list to perform a co2 test. Which we have been unable to figure out how to perform.