Science & Mathematics - 13 December 2007

I'm in college and I struggled to get a C+ in chem 1. I thought I had a pretty good grasp of it but I just can't understand electron shells and all that stuff. As far as we went was 3d electron diagrams, tetrahedrals, trigonal bipyramidal etc.

Could I handle chemistry 2? I registrered for it next sem. but I don't know anymore, does it get much more complicated?

2007-12-13 11:39:45 · 3 answers · asked by Anonymous in Chemistry

I am doing a science project on batteries . I know this is something people don't normally believe in, but I tried it and it worked. Now what I have to do is write a report on it, using the scientific method. I'm pasting the document I wrote up below this, please correct my errors or anything I can do to make it better. I need it in less than 13 hours, so any help is really appreciated.

2007-12-13 11:36:50 · 4 answers · asked by Prash 3 in Other - Science

i tried to solve integration by parts and other techniques...but i couldnt solve it... i also dont know if it exists! i want to know how to check its existence and if possiblke the solution of this integral
thank you so much!

2007-12-13 11:34:38 · 5 answers · asked by aydemir i 1 in Mathematics

A perfectly straight tunnel is drilled trough the Earth, from the North pole to the Equator, as seen in the link (curtesy of "Jack"):

http://s226.photobucket.com/albums/dd11/jackphotos123/?action=view¤t=Cat3b.jpg

Let's say the tunnel is exactly 9020 km long.

The tunnel's floor is flat and coverd with solid Skatelite material.

Bart decides to try his new skateboard in the tunnel.

He stands at the very edge of the tunnel, which is at a 45 degree angle from his skateboard, he slides right in.

Lisa is waiting on the other side with a long rope, tied to a solid tree, 1 km from the hole, just in case.

If Lisa needs to throw the rope in to help her brother out of the tunnel how long a rope would she need?

Is the straight tunnel the equivalent of a 9020 km halfpipe?

Would its "equivalent shape" be the same as the arc of the Earth over the lenght of the hole?

2007-12-13 11:33:11 · 3 answers · asked by Yahoo! 5 in Physics

2007-12-13 11:31:52 · 2 answers · asked by Aunt Doobie 6 in Other - Science

the question is like this:

"The empirical formula for a compound is C2H3As3Cu2O8 with a molar mass of 1013.71g. What is the molecular formula?"

i dont understand how you to find the molecular formula here -_-

2007-12-13 11:29:29 · 7 answers · asked by Anonymous in Chemistry

??

2007-12-13 11:28:43 · 5 answers · asked by Optimus Prime 2 in Chemistry

are B+'s good???

2007-12-13 11:28:14 · 10 answers · asked by iHeartChem 2 in Chemistry

i know animals do, but how about plants?

2007-12-13 11:26:10 · 3 answers · asked by Anonymous in Other - Science

I'm doing an essay and need some help, PLEASE and THANKS! so my question is, describe the factors that have made the Rhine River the "Industrial Heartland" of Europe?

2007-12-13 11:25:13 · 2 answers · asked by Anonymous in Geography

Equation of the line:

(x-1)/3 = (y+3)/1 = (z)/2

Given point (2,3,1)

Find the equation of the plane that has this line and point.
____________________
OK so I got to this point:

In vector form, r(t) = (1,-3,0) + t(5,1,2)

Let t = 0 then (1,-3,0) is in the plane
Let t = 1 then (6,-2,2) is in the plane

So I now have 3 points on the plane. How do I use this to find the equation of the plane?

If I assign "P,Q,R" to these and use:

n = (q-p) x (r-p) = (x,y,z) etc.

Does it matter what point is assigned to P,Q or R? This is what I can't get my head around.

2007-12-13 11:24:14 · 1 answers · asked by Anonymous in Mathematics

OK WELL
IM STUDYINBUT I DONT REALY UNDERTAND IDEAL MACHINES

Work in = W ork out

I DONT GE THTAT HELP ME !!!!!!!

2007-12-13 11:21:40 · 2 answers · asked by :}smile :} 1 in Chemistry

2007-12-13 11:20:03 · 11 answers · asked by ??? 2 in Mathematics

I really need to know....

2007-12-13 11:16:07 · 1 answers · asked by jimmyjones. 1 in Botany

2007-12-13 11:11:25 · 0 answers · asked by Anonymous in Chemistry

I know that this statement is false but I need to know why. Where are Cepheid Variables usually found?

Thanks!

2007-12-13 11:10:14 · 2 answers · asked by lastchicken 1 in Astronomy & Space

2007-12-13 11:09:50 · 2 answers · asked by 2bamasterkristi 2 in Geography

2007-12-13 11:09:49 · 3 answers · asked by Anonymous in Chemistry

2007-12-13 11:08:42 · 1 answers · asked by Anonymous in Chemistry

I understand that time dilation is when the gravitational pull will change the distance the speed of light is traveling. However, how would this work for a mechanical clock? Say the arms of the clock act as the speed of light and it sits on a strong gravitational pull. Since the arms travel in a circle it would be faster going from the 12 spot to the 6 (since it is moving toward the pull) but slower going from the 6 to the 12 (since it is moving away from pull)? Therefore, evening itself out and there would be no time change, right?

2007-12-13 11:07:54 · 1 answers · asked by battlin_buccos 2 in Physics

if i have 200 grams of O2, at 2 atm pressure and 273.15 Kelvin, what will be the volume of gas?

2007-12-13 11:07:42 · 1 answers · asked by blueeyegreen 1 in Chemistry

can some one help me with this

2007-12-13 11:07:36 · 7 answers · asked by Anonymous in Mathematics

if i subject CH3-CH2-CH2-CH2-OH to dehydration, what will be the products???

2007-12-13 11:06:06 · 5 answers · asked by frizzy_ghost 1 in Chemistry

this is for my chemistry class. if u didnt get the question its, if you covered washington state in one mole of M&M's how many miles deep would it cover? i figured out that there is 22 M&M's per 25 mL or 22 M&M's per 25 cm^3. I dont know where to go from there and i need to show all my math steps. some helpful conversions he gave me were 1 mole = 6.022 x 10^23. 1 mL = 1 cm^3. and 1 mile = 1.6093 km. and washington state area = 68,182 miles^2 HELP!

2007-12-13 11:06:05 · 4 answers · asked by TeeJay 2 in Mathematics

Is there any kind of website that calculates the likely hood of a snow day in a given area?

2007-12-13 11:04:32 · 5 answers · asked by ??? 4 in Weather

...processes which increases the information in the genome?

empirical please

2007-12-13 11:02:45 · 3 answers · asked by Sam 4 in Biology

The site will help u see the problem better
Please show work so I can understand it myself better.
http://docs.google.com/Doc?id=dg4zw6jf_5c6ttxchm

2007-12-13 11:02:15 · 9 answers · asked by BBT 1 in Mathematics

I have a huge midterm tomorrow and im trying my best to study now but i dont know how to do it?!?

the directions say "solve each system by subsitiuion"
example:

3x-2y=7
x+3y=-5

plz explain how to solve by subsitiutiong for x and y?

2007-12-13 10:59:51 · 11 answers · asked by Anonymous in Mathematics

May sound silly but, is space made up of
a)quantifyable parts or
b)completely empty and essentially non-existant?

Presumably answer A signifies a finite universe surrounded by event horizon and B signifies that only matter is finite within a potentially infinate\reoccuring arena?

Does anyone know or are we all just spouting crap?

2007-12-13 10:57:21 · 11 answers · asked by The Will 2 Defy 4 in Physics

what is the solution to 2^x=9^x-9

please help!?!?!

2007-12-13 10:57:15 · 1 answers · asked by Ayy Girl! 1 in Mathematics