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Are you allowed to have on your observation for example, "the sample sank in water, indicating that it has a greater density then water" or is that considered an inference and you get docked points?

Since the fact that it sinks in water INDICATES that it has a higher density, then I would definitely consider it as an inference.

EASTstroudsburg13 wrote:Since the fact that it sinks in water INDICATES that it has a higher density, then I would definitely consider it as an inference.

So that means you would get points taken off right?

I think so.

How many reagents did people get at nationals and how much time was given?

ptkid wrote:How many reagents did people get at nationals and how much time was given?

I'm curious as well. Also, at Nationals did they provide a triple beam balance and a thermometer? I know they had a hotplate so I'm assuming there was a thermometer...
And also the time thing...the rules manual is so unclear since it says recommended 25-35 minutes so they could give unreasonable amounts of time...
Thanks

Would subtracting the beaker weight from the beaker + powder weight be considered an inference?

EpicFailure wrote:Would subtracting the beaker weight from the beaker + powder weight be considered an inference?

I think so; we got docked off points at an invitational when we did that. Usually we write beaker mass and beaker+powder mass as two separate obs. and if the question asks just show work, like some of the tests in the exchange have.

EDIT: Also, I was looking at a few tests.
Do you have to write that the powder is solid, or could you back this up by stating crystals/grains/something of the sort, since liquids don't usually have crystals. Also, when you add the powder to a liquid, do you have to write the color is clear or is no color change fine? Same for odor, bubbles, fizz, etc.

Write down what you see directly, not what you think happened.

So liquid is clear, or odor is soapy?