Scioly.org

T-B wrote:

When dealing with certain powders, I seemed to have trouble determining whether the Plaster of Paris bubbles. Specific resources tell me otherwise; it could be our version, however I am uncertain. Does the Plaster of Paris bubble/sizzle?

The powder to use is Gypsum, not Plaster of Paris. Yes, chemically the same, but one has been cooked and the other not. That my account for why your results are not the same as you've seen posted.

In competition, it's not uncommon to see Plaster of Paris in its commercial form. You should be familiar with how that behaves, too, because event supervisors may give you Plaster of Paris instead of "uncooked" gypsum powder.

Another thing my partner and I noticed in this event last year is that there are certain peripheral properties not of the powders themselves, but of their most easily accessible forms, that can- in a pinch- be used to identify them. For example, vitamin C powder samples were often crushed vitamin C tablets, which might have a slight pink, orange, yellow, or green tint and a citrus scent, simply because that's how the tablets were marketed. The supervisors figured it was close enough to white that it didn't matter. Similarly, Plaster of Paris samples sometimes contained traces of the fibers that it normally has in it for structural purposes. These things aren't really the most important things to know- not least because they're not always present- but it can be a good idea to be aware that if you see fibers, it's probably Plaster of Paris, and if you see a pink/orange/yellow/green tint or smell something citrusy, it's probably vitamin C. There are probably other examples, too, but those are the ones I can think of at the moment.

T-B wrote:

Re: Science Crime Busters B
New postby lol161458 on Wed Mar 31, 2010 6:59 pm
hey guys! i am on the science olympaid team at roberson middle school . i am so excited to be going to state
compition . this is the first year that my school has been open and this also the first year we have had science olympaid and were going to state wop-wop .we got 4th place at regional compietion

That's cool that your team did so well in their first year. You must have some good teammates. Good luck at State -- it is tougher both in the tests and the level of competition. Study, but stay cool and you'll do well.

P.S. I think your post was totally appropriate for this venue, and not a security risk at all....

Ok how was that post relate with anything on this forum? hmm? show me that and I'll leave it alone. And how is a post stating what school you go to not a security risk?? This is a public forum, any old stalker could get on here an search your school name and find you.

Draylon Fogg wrote:

T-B wrote:

Re: Science Crime Busters B
New postby lol161458 on Wed Mar 31, 2010 6:59 pm
hey guys! i am on the science olympaid team at roberson middle school . i am so excited to be going to state
compition . this is the first year that my school has been open and this also the first year we have had science olympaid and were going to state wop-wop .we got 4th place at regional compietion

That's cool that your team did so well in their first year. You must have some good teammates. Good luck at State -- it is tougher both in the tests and the level of competition. Study, but stay cool and you'll do well.

P.S. I think your post was totally appropriate for this venue, and not a security risk at all....

Ok how was that post relate with anything on this forum? hmm? show me that and I'll leave it alone. And how is a post stating what school you go to not a security risk?? This is a public forum, any old stalker could get on here an search your school name and find you.

While I personally agree that it is a security risk, I believe that this argument has nothing to do with the forum either. In that spirit, I'll stop talking...

Yes let's.....so I still don't fully understand, is the red cabbage just another reagent or is it more, some previous posts seemed to contradict each other...

Does anyone know how to tell the difference between Tin and Aluminum?

I find aluminum to be dull and tin to be shiny. tin can also have a yellowish tint

Aluminum- Has yellow/orangish tints occasionnally. A bit darker
Tin- Lighter. Usually there look like there are lines

BeeVolturi wrote:Aluminum- Has yellow/orangish tints occasionnally. A bit darker
Tin- Lighter. Usually there look like there are lines

I think I'd say the opposite... tin is a bit darker, and sometimes yellow-tinted. Aluminum is lighter and usually un-tinted.

Phenylethylamine wrote:

BeeVolturi wrote:Aluminum- Has yellow/orangish tints occasionnally. A bit darker
Tin- Lighter. Usually there look like there are lines

I think I'd say the opposite... tin is a bit darker, and sometimes yellow-tinted. Aluminum is lighter and usually un-tinted.

Oops, I accidentally switched it.... XDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

does anyone know any websites that have charts with all the results that are trustworthy because one that i have found are wrong when i use them so...