Can't Judge a Powder B

[liar78]

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?

[EastStroudsburg13]

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

[liar78]

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?

[Cheesy Pie]

I think so.

[ptkid]

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

[hpfananu]

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

[EpicFailure]

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

[hpfananu]

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.

[Cheesy Pie]

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

[hpfananu]

So liquid is clear, or odor is soapy?