Science & Mathematics - 19 October 2007

i'm stuck on a chem problem that i have been looking at for about 30 min. If anyone can help that would be greatly appreciated!(Please explain why too!)

Identify the hybridization of the carbon atom(s) in CO3-2

Also give the number of π bonds in the molecule or ion

2007-10-19 10:26:56 · 2 answers · asked by Anonymous in Chemistry

2007-10-19 10:23:01 · 4 answers · asked by lisa 2 in Physics

Which of the following compounds have a nonzero dipole moment?
a) SiBrH3 b) NH4+ c) GaH3 d) H2

must enter all tru statements

2007-10-19 10:22:02 · 3 answers · asked by physicsisgay 2 in Chemistry

I saw this video on myspace videos and it had a person filling up a glass of water, then putting 2 batteries in the water for 40 minutes. He then lit a match to it and the water ignited.

Is this true or did he fake it?

2007-10-19 10:21:29 · 7 answers · asked by Chris Stewart 5 in Chemistry

Two ice skaters are holding hands at the center of a frozen pond when an argument ensues. Skater A shoves skater B along a horizontal direction.

(a) Identify the horizontal forces acting on A.
__skater B's momentum
__skater A's inertia
__gravity
__force from skater B
__normal force of ice



(b) Identify the horizontal forces acting on B.
__force from skater A
__normal force of ice
__gravity
__skater B's inertia
__skater A's momentum


(c) Which force is greater, the force on A or the force on B?
__the force on A
__the force on B
__the forces are the same size
__we need to know the skaters' masses

(d) Can conservation of momentum be used for the system of A and B?
__yes
__no

Defend your answer.


(e) If A has a mass of 0.620 times that of B, and B begins to move away with a speed of 2.25 m/s, find the speed of A
in m/s

2007-10-19 10:18:05 · 2 answers · asked by Sasha 1 in Physics

1) The energy of the electron in the lowest level of the hydrogen atom (n=1) is -2.179×10-18 J.
What is the energy of the electron in level n=5?

2) The electron in a hydrogen atom moves from level n=1 to level n=2. (a) Is a photon emitted or absorbed? (b) What is the wavelength of the photon?

3) An excited hydrogen atom emits a photon with a wavelength of 486.2 nm. (a) In what region of the spectrum is this photon? (b) What is the frequency of this photon?

4 A hydrogen atom in the ground state absorbs a photon of wavelength 97.2 nm. (a) What energy level does the electron reach? (b) This excited atom then emits a photon of wavelength 486.2 nm. What energy level does the electron fall to?

2007-10-19 10:16:55 · 3 answers · asked by KC 1 in Chemistry

or is it the farthest away but the brightest ?or is it the smallest and closest ? or biggest but closest ? or the farthest away ? ....hmmmmmmm my universe is perplexing ...

2007-10-19 10:12:21 · 13 answers · asked by insenergy 5 in Astronomy & Space

2007-10-19 10:03:26 · 11 answers · asked by Anonymous in Physics

The number of pounds of
milk, M, required by a calf weighing x pounds can be estimated by the formula


M = -5 + sqrt(6.7x - 444)

Estimate the number of pounds of milk required by a calf with a weight of 300
pounds.

2007-10-19 10:01:40 · 2 answers · asked by Anonymous in Mathematics

______C_____
l---------------------l
l---------------------l
R-----------------L
l---------------------l
l---------------------l
l-------~------------l

what is the value of the inductance L so that the above circuit carries the largest current?

data: R= 2.69 x 10^2 ohm, f=1.81 x 10^3 Hz, C=6.10 x 10^-3 F, Vrms = 7.29 x 10^1 V

2007-10-19 10:01:06 · 3 answers · asked by Anonymous in Physics

sqrt(2x + 3) - 5 = -2

2007-10-19 10:00:19 · 5 answers · asked by Anonymous in Mathematics

alien or unknown object

2007-10-19 10:00:16 · 17 answers · asked by Anonymous in Astronomy & Space

van allen belts alive ? how could we do it now? nevermind back then

2007-10-19 09:57:09 · 11 answers · asked by Anonymous in Astronomy & Space

Who's holding up the u.f.o. disclosure project and why ?If you would like more detail go to youtube all the information you would want.

2007-10-19 09:56:17 · 3 answers · asked by rainbowmatrixs 4 in Astronomy & Space

radicands represent positive real numbers.


sqrt(5a) + sqrt(45a^3)

2007-10-19 09:55:24 · 2 answers · asked by Anonymous in Mathematics

radicands represent positive real numbers.


cube root(27) - 5*cube root(8)

2007-10-19 09:54:28 · 1 answers · asked by Anonymous in Mathematics

Date Sufficiency, decide and explain if the statements 1 or 2 or independently sufficient/insufficient to answer the problem, or need each other for sufficiency, or both wont work

the daily news has 25 reporters covering asia, 20 covering europe and 20 covering north america. 4 reporters cover asia and europe but not north america. 6 cover north america and asia but not europe. 7 cover north america and europe but not asia. how many reporters cover all 3 continents.?

Statement 1. Daily News has 38 reporters in total covering at least 1 of the following continents, asia, europe and north america.

Statement 2. there are more daily news reporters covering only asia than there are daily news reporters covering only north america.


thats a mouthful guys, im having problems with this one... some great minds are requested to explain this one.... thank you in advance.

2007-10-19 09:53:52 · 1 answers · asked by mandeep s 1 in Mathematics

3u2 = 8u – 5

2007-10-19 09:51:47 · 7 answers · asked by Anonymous in Mathematics

Platinol is an anticancer drug with molecular formula Pt(NH3)2Cl2. Platinum is a precious metal, and the cost of making platinol is determined by the cost of the platinum, which is $19.00 per gram. One dose of the drug contains 11.9 mg of platinol. How many doses of platinol could be produced for 71.8 dollars?

2007-10-19 09:51:04 · 2 answers · asked by cory c 1 in Chemistry

i got options a.mass *force due to balanced forces
b.mass *acceleration due to greavity
c.mass*inetria
d.mass*air rwsisitance

2007-10-19 09:50:30 · 7 answers · asked by ? 2 in Astronomy & Space

I would like to melt down old necklaces, coins, jewlery and just have bars of precious metals if it is possible. Anyone know how to do this

2007-10-19 09:50:25 · 1 answers · asked by davetemp60067 1 in Chemistry

2007-10-19 09:47:39 · 6 answers · asked by Kenneth George Houdek 3 in Astronomy & Space

3/x
(x - 1)/x^2

2007-10-19 09:47:29 · 3 answers · asked by Lu Y 1 in Mathematics

2007-10-19 09:44:33 · 3 answers · asked by Lu Y 1 in Mathematics

i cant find what they grow! help

2007-10-19 09:41:29 · 2 answers · asked by umiplum 2 in Agriculture

2007-10-19 09:41:09 · 12 answers · asked by Anonymous in Other - Science

2007-10-19 09:40:55 · 5 answers · asked by Anonymous in Paranormal Phenomena

2007-10-19 09:40:06 · 9 answers · asked by nick 1234 1 in Weather

Best responses receive 10 Points

I need help with these problems. I've worked them out on my own and still had difficulties with them. Serious resolution.

Reduce answers to lowest terms


1.) 3/5 + 1/3



2.) 3/5 - 1/3


3.) 3/5 x 1/3


4.) 3/5 divided by 1/3



5.) 1/3 + 5/6

2007-10-19 09:39:57 · 7 answers · asked by ione_thestar1 4 in Mathematics

****How much shelter will be found in each case by taking a small boat to the lee side of the island?

2007-10-19 09:39:57 · 1 answers · asked by kntagler 1 in Physics