Nursing Students Pre-Nursing
Published Jan 5, 2006
I am starting Chem II this semester. Anyone want to start a club???
stacyinMD
29 Posts
This is the BEST Chemistry site I have found on the internet. It's aimed toward high school chemistry, but it has been such an asset for me. http://dbhs.wvusd.k12.ca.us/webdocs/ChemTeamIndex.html
Thanks so much for this link! I forwarded to the students in my chem class. Very helpful!
Stacy
maliat
257 Posts
Hi Everyone, hope your semester is off to a great start. I'm fortunate enough to have two professors who seem approachable if I need help.I have a question I forgot to ask before leaving class last night....does anyone know how to do subscripts using microsoft word? I'm trying to type my lab report and I can't remember how to do this. Thanks so much!!!Stacy
I have a question I forgot to ask before leaving class last night....does anyone know how to do subscripts using microsoft word? I'm trying to type my lab report and I can't remember how to do this.
Thanks so much!!!
Select the number you want to change, then go to Format, then select font. Under effects you'll see subscript.
I hope this helps.
Malia
Select the number you want to change, then go to Format, then select font. Under effects you'll see subscript.I hope this helps.Malia
Thanks so much Malia! I tried your trick...I had to use superscript for scientific notation.
MJJFan1, BSN, RN
203 Posts
I UNDERSTAND IT!!!!!!! I was having trouble with Stoichiometry, I was actually contemplating dropping the class-that's how much I didn't understand it- but guess what? 20 minutes of help from my husband and I have it all down. I can't go wrong. I can't believe how easy it is.
droopy1592
190 Posts
I'm new here but really good in chemistry... If you have any questions you can PM me and I can try to help you.
JeanettePNP, MSN, RN, NP
1 Article; 1,863 Posts
Chemistry question: Can anyone explain why atomic radii get smaller as you go across the Periodic Table (with increasing number of electrons), but ionic radii get bigger the more electrons they have? The explanations given for the two seem contradictory - the atomic radius gets smaller because the greater number of electrons create a bigger charge getting pulled towards the nucleus. In ions, the extra electrons are less attracted to the nucleus so the radius is bigger.
casi, ASN, RN
2,063 Posts
As you go across the the nuclear charge increases (#protons-# core electrons) causing a stronger pull on outter electrons pulling them in closer to the nucleus. So the closer to having the outter valence full the closer the outter electrons are pulled to the nucleus.
As you go down the periodic table radii get bigger due to additional more electron shells. The more electron shells the less attraction, but the closer to filling the valence shell the more attraction.
I don't think I'm making any sense. Sorry.
I think I'm getting it.
More protons = more attraction to the nucleus
More electron shells - more shielding effect, less attraction to the nucleus
Additional electrons (ions) - less attraction to the nucleus
beepeadoo
84 Posts
I think I'm getting it.More protons = more attraction to the nucleusMore electron shells - more shielding effect, less attraction to the nucleusAdditional electrons (ions) - less attraction to the nucleus
You got it exactly!
Good explanation
andrea5
13 Posts
I'm am so stuck, please can anyone help me with this q
A sample of neon gas occupies a volume of 23.4L at STP. What volume, in liters, will it occupy at a pressure of 0.750 atm and a temp of -20 C?
br107
86 Posts
The question is asking you to compare 2 situations.
First look at what your'e given...
P1 = STP = 1.00 atm
V1 = 23.4L
T1 = STP = 273K
P2 = 0.750 atm
V2 = ???L
T2 = -20.0C = 253K
Considering the givens, we should compare relationships using the combined gas law:
(P1V1)/T1 = (P2V2)/T2
I prefer algebra. So solving algebraically,
V2 = (T2)*(P1V1)/(T1/P2) =
1.00atm * 23.4L * 253K
------------------------
0.750atm * 273k
= 28.9L
NOW FOR WHY I'M HERE....anyone got good websites for organic or biochem?