AllenWang314 wrote:For the Rfs of different molecules on nationals tests, the answer key usually just says things like 0.97, 0.55, 0.34, 0.24. Do they allow for a range of answers, so if I say 0.95, 0.59, 0.32, 0.22, will they accept that as valid, or will they only accept exactly what they have, can somebody with experience answer this?
Also, how does fluorescence work? Do we just take the gel-paper thing and shine a "flashlight"/blacklight at it? Are there two buttons on the blacklight for long and short wave length?
You definitely don't want to be off by too much but I would think so (then again they never return your nats tests so in reality you will never know).
And for your second question:
pikachu4919 wrote:AllenWang314 wrote:Regarding national tests, what is fluorescence? What area (chromat, fibers, blood, or chem) of the event is it about? And what do we have to know about it, and what are websites that can give enough info?
The fluorescence is part of the TLC (thin layer chromat) you'll be doing on samples of different kinds of paints. iirc you perform the TLC on the paint and see if your sample will glow under different wavelength settings of a blacklight, and that's most of what you do.