Chemistry Study Group for Spring 2009

Sand_Dollar, BSN · Feb 2, 2009

I rated my two last professors on ratemyprofessor.com and the ratings never showed up, I wonder how many others have that problem too.

Princess_M83 · Feb 3, 2009

I had never used it before and when I found out who was going to be teaching, I went to look her up..... she wasn't on there. I haven't used it to rate anyone yet. On another note..... YAYYYYYY Me, I am starting to understand the conversions. :yeah:

Sand_Dollar, BSN · Feb 3, 2009

Good for you Princess, that's great!! :yeah:

KathyRN2B · Feb 5, 2009

Quick update......went to tutoring tonight. It was actually better than I thought it would be. Really. He's a cool instructor anyways as a person, but he was really laid back teaching-wise. He went over every single problem that was on the test. Funny thing is, I knew the material! This is what I think happened....the chicks asked what should we study, he told us. Went home, studied, etc. Test day-- nothing I studied was on there. Immediate brain fart.

He let us know that not this Sat. class, but next Sat., 14th, we'll be having another test, this one cummulative. You can bet I'll be ready. Glad this li'l situation worked itself out. Now I have to throw in TEAS test study time :yawn: :no: :banghead:

fizzlilma03 · Feb 6, 2009

i need some help

im takin ch 101 (general chem)

this is the problem:

During the summertime in Atlanta, the jet stream moves north towards Canada, and the atmosphere often stagnates. Weather forecasters give daily ozone warnings to the elderly and to people with asthma because ozone build-up in the air is harmful. Typically, an adult will in hale 2.1 liters of air per breath. What mass of ozone in micrograms is taken into the lungs per breath by an adult breathing air containing 3.64 x 10 to the negative 4 micrograms of ozone per cubic centimeter of air?

i got .7644 micrograms

my teacher said im missing a step

can anyone help?

Cilantrophobe · Feb 6, 2009

I am anxious to see what others have to say. I got the same answer

fizzlilma03 · Feb 6, 2009

she kept saying think about when u inhale

so i think its something 2 do wit lungs per breath part

but i dont know

Cilantrophobe · Feb 6, 2009

That doesn't really make any sense ("lungs per breath") because she is asking how many micrograms per breath, not per minute, per hour, etc. So the "per breath" portion is not converted to anything else, from the problem you gave us.

If she were to ask you how many micrograms per hour then you would have to convert that accordingly. But you can only convert Liters to cc and then, micrograms per cc. If a step is missing then she (or you) left it out when it was typed up.

fizzlilma03 · Feb 6, 2009

i copy n paste from the worksheet

i dont know i keep askin ppl n everybody gets the right answer so i guess its right

WantAccel.BSN, BSN, RN · Feb 6, 2009

I need some help about a question regarding variably valent metals in compounds. The question is "Write the names of the following compounds in the blanks provided." The formula I'm struggling with is "MnO2" (the 2 is in subscript). I've contacted my teacher about it, because this makes no sense to me. Manganese is only supposed to have charges of either +2 or +3. Oxygen has a charge of -2. I would think the formula would be MnO if it were Manganese (II) (the +2 and -2 charges cancel each other out) or Mn2O3 if it were Manganese (III). I think the formula is written incorrectly, and can't seem to figure out how to make that work in my head. It would make sense if there was such a thing as Manganese (IV), but there isn't supposed to be.

Thank you all so much!

Cilantrophobe · Feb 7, 2009

WantAccelBSN:

http://ceramic-materials.com/cermat/oxide/mno2.html

I hope this helps.

Princess_M83 · Feb 10, 2009

A metal bar displaces 0.82 L water. What is the mass in kilograms? Density of metal = 19.3g/cm cubed

We got 1.5826 x10 to the 5 kg

Is that right?