Science & Mathematics - 26 August 2007

I have received a few IR spectra of un unkown compound, which is a solid probe.The IRs were taken on both surfaces: glossy and opaque. The peaks of each face of the probe are almost the same for each type of absorbtion, just the amount of energy absorbed is different(for ex.: at 1238cm-1 for one face I have 85%(glossy face) of absorbance and for the other 80%(opaque face)). What could cause this difference of absorbance for the same functional group? The two spectra, often, are overlaped, the shape of the peak is the same, but also I have a difference of 5-10% in absorbance.
Around 2350cm-1 on one spectra I have a weak (double peak) absorbtion and on another spectra I have a peak with the same shape but seen in a mirror; instead to have a peak downward, I have upward.

Please help me....
For more information, I could send you a pdf copy of the spectra.

2007-08-26 03:26:39 · 2 answers · asked by Valentina C. 1 in Chemistry

Serious answers only, please :]
It's for school.

2007-08-26 03:21:42 · 5 answers · asked by i use Y!A 1 in Astronomy & Space

I am told that chemistry has not been reduced to known elementary particle physics. Usually, we would say that the problem is that the equations are too complex. I am curious to know some simple examples of this difficulty. The simpler is the atom or the molecule in the example the better it is. It would also be interesting to know a property of a complex atom or molecule that we have reduced to elementary particle physics, but it is not what I ask, though it is closely related.

My motivation to ask this question is to get a feeling for how much "evidence" we have that it is only a problem in solving the equations. If we have succeeded for *all* observed properties up to some reasonably high level of complexity (in the number of particles/atoms) and it is seems clear that there is nothing special in the next step except the additional particle/atom, then it is good "evidence" that it is just a problem in solving the equations. Otherwise, maybe there is a more fundamental problem.

2007-08-26 03:13:23 · 1 answers · asked by My account has been compromised 2 in Chemistry

It sounds obvious....but really, why are they the same color?

2007-08-26 03:05:41 · 6 answers · asked by chrstopher 1 in Biology

Would the Earth shake? What would happen?

2007-08-26 03:04:06 · 6 answers · asked by DiMooch 3 in Physics

A rabbit is running on a straight line with velocity v=2m/s. A wolf is lying 40m from the line .The moment the rabbit is 40m far from the wolf , the wolf realizes it and starts to pursue it with v=2m/s .After 40 seconds, what is the minimum distance between them?

This is what I did:

displacement= Velocity x time--> 2 m/s x 40 s= 80 m

this is for the rabbit since it runs at a constant velocity throughout the run/chase

The wolf however starts from rest than accelerates to 2m/s and pursues rabbit therefore
displacement= avg. velocity x time= Vi+Vf/2 x time= 0+2m/s /2 x 40 s= 40 m

The minimum distance between the wolf and the rabbit after 40s is 80m-40m= 40m

The answer is not 40 meters and I don't know what else it can be. Please help!

2007-08-26 03:00:29 · 2 answers · asked by Kiwikahuna 2 in Physics

Its not matter, Its produced by burning matter. Its not an energy, it gives out energy- heat and light. My physics teacher told me everything is either matter or energy but fire doesnt seem to be either

2007-08-26 02:57:47 · 14 answers · asked by Jimmy c 1 in Physics

Would you please explain the answer of this problem to me.

(2x-1/6) - (x/3) = (x + 4/18)

Thank you very much

2007-08-26 02:55:09 · 5 answers · asked by Gator Girl 5 in Mathematics

any ideas how i can test for the durability of the soap i made in school? must be able to be carried out using the apparatus in a science lab...thanks.

2007-08-26 02:46:07 · 3 answers · asked by Anonymous in Other - Science

so we have the circle x²+y²=10, which means its center is at (0,0) and it has a radius of √10. it has two tangents (i think it's two) that pass through the point (5,5). what are the general equations (form ax+bx+c=0) of the two lines?

that's all that's given, it cannot be impossible, and i've seen something like it on Answers. immediate help would be gladly gladly appreciated.

2007-08-26 02:45:48 · 5 answers · asked by crushedblackice 3 in Mathematics

2007-08-26 02:44:06 · 5 answers · asked by bella f 1 in Physics

2007-08-26 02:43:43 · 5 answers · asked by Anonymous in Astronomy & Space

2007-08-26 02:42:02 · 6 answers · asked by bella f 1 in Physics

2007-08-26 02:40:53 · 8 answers · asked by bella f 1 in Physics

Water /never goes away / we have more now ??

2007-08-26 02:39:08 · 4 answers · asked by Anonymous in Earth Sciences & Geology

Hi folks im Baz a Nurse and i am very concerned about the medical question and answers section on Yahoo.
There are some very stupid and idiotic people giving very DANGEROUS & HARMFUL medical advice to all sorts of people on here about things they quite clearly know absolutely nothing about.
I am going to try my damdest to get this 1 section of Yahoo question taken off or someone could end up seriously ill or even dead.
What do you think ??

2007-08-26 02:36:37 · 21 answers · asked by Phat Baz 3 in Medicine

What measuring device can I used for measuring the speed of a rotating egg?

2007-08-26 02:32:37 · 2 answers · asked by physics maniac 2 in Other - Science

2007-08-26 02:30:29 · 8 answers · asked by Anonymous in Botany

2007-08-26 02:26:54 · 7 answers · asked by Troy H 1 in Biology

Find the present value of 11 payments of 3576 made at the start of each year. Interest is 9% compounded annually.

I got this answer: 24335.39 which is wrong!
The correct one is: 26525.58 <
I have done it this way.. but I got the wrong answer....

3576 * [ (1 - (1.09)^-11 )÷ 0.09 ] = 24335.39

where did I go wrong?

2007-08-26 02:12:04 · 2 answers · asked by Yuuji 1 in Mathematics

2007-08-26 02:11:33 · 3 answers · asked by Kashi 1 in Physics

Solve the system by the method of your choice:
8x+7y=56
y= -8/7x +8
Choose the correct form of the solution below:
no solution
one solution { (a, b) }
infinite solutions { (x, y) | y = ax + b }

If your choice includes a letter a or b, enter the correct numeric value. Otherwise, enter N/A.
a =
b =

2007-08-26 02:09:12 · 6 answers · asked by Anonymous in Mathematics

2007-08-26 02:08:04 · 5 answers · asked by Me 3 in Earth Sciences & Geology

Given that y=sin^-1 x, find the series expansion of y in ascending powers up to and including the term in x^3.

I have done this part and i got y=x+x^3/6 but you can double check.

Hence, by choosing a suitable value of x, deduce the result of pi to five decimal place.

i sort of used pi/2=y=sin^-1 x
so x=1
then pi= 2 x (1+1/6)
but this answer is like very far from the true value of pi!!

2007-08-26 02:03:31 · 4 answers · asked by Anonymous in Mathematics

Volume: A box 10 inches high has a square base. The box was made 7 inches longer, and 2 inches narrower (or its width was decreased by 2 inches) while the height remained 10 inches. Give the original length of one side of the box if these changes increased the volume of the box by 30.

2007-08-26 01:50:50 · 7 answers · asked by Anonymous in Mathematics

2007-08-26 01:40:36 · 12 answers · asked by jodeba66 2 in Astronomy & Space

2007-08-26 01:37:27 · 3 answers · asked by Gilbert P 1 in Zoology

Can someone help me please?...I don't know how to write a balance equation for:

Sodium thiosulfate pentahydrate + Water =>
( Na2S2O3.5H2O) + (H20) =>

Thank you....

2007-08-26 01:36:00 · 1 answers · asked by Pis 1 in Chemistry

2007-08-26 01:34:47 · 13 answers · asked by just fun 1 in Medicine

If x and y are the sum of roots of the quadratic 2x^2 + x -15 = 0

Find
x^2y^3+x^3y^2

i have no idea how to do this. . . .
i need as much help as i can get. . .
thanks =]

2007-08-26 01:19:53 · 6 answers · asked by Hmmmmm 3 in Mathematics