Science & Mathematics - 22 August 2007

2007-08-22 02:04:42 · 8 answers · asked by Anonymous in Mathematics

Is there any easy way to do this or is it just a ridiculously large equation I need to use?

The question is...Calculate the ionic strength for an aqueous solution with 0.002 mol/kg NaCO3

and next question says to estimate the mean ionic activity coefficient of the aqueous solution at 25 degrees C.

I really dont want to do this but I must!
If you answer, please explain, this is just a sample question to prepare me for a test so straight up answers are of no use to me! Ta:)

2007-08-22 02:00:20 · 3 answers · asked by Saved777 1 in Chemistry

2007-08-22 01:56:57 · 3 answers · asked by George L 1 in Engineering

2007-08-22 01:56:14 · 8 answers · asked by Netsky 1 in Geography

2007-08-22 01:50:11 · 3 answers · asked by sci_voir 1 in Other - Science

I googled it but could not find relevant results.

I really need help in the detailed procedure. A link that contains the preparation of copper(II) nitrate will do as well.

thanks.

2007-08-22 01:47:05 · 5 answers · asked by N.y.Rych 1 in Chemistry

would it be trigonal planer? can someone explain it please?

im rubbish at chemistry!

2007-08-22 01:45:16 · 7 answers · asked by Anonymous in Chemistry

The Governor General had a mountain in Alberta named after him. He climbed it, at age 80, to attend the naming ceremony. What is his name?

2007-08-22 01:45:16 · 7 answers · asked by Anonymous in Geography

Why must the litmus paper must be moistened with water before using it to test for ammonia?

2007-08-22 01:43:52 · 3 answers · asked by icydollie xD 1 in Chemistry

The properties should be used are:
1) Distributive Property
2) Additive Inverse Property
3) Multiplicative Identity Property
4) Multiplication Property Of Zero
5) Cancellation Property Of Addition

Please answer this question because the answers given in my last question was not correct.
The proving should start with the equation:
(-1)a = -a
And should end also in the equation:
(-1)a = -a
Please answer on or before Sunday, August 26, 2007 on any time zone.

2007-08-22 01:43:25 · 4 answers · asked by Anonymous in Mathematics

HOW DOES an electric motor works??????????????

2007-08-22 01:40:56 · 4 answers · asked by jaya 2 in Physics

the matters are liquid,solid,gas..and why are we interested in it's changes?

2007-08-22 01:36:59 · 5 answers · asked by Anonymous in Physics

pbs+o2--> Pbo+so2

Please help me balance these equations

2007-08-22 01:36:17 · 5 answers · asked by Anonymous in Chemistry

I am interested to know about Cartap Hydrochloride 50% SP formulation. Hows it formulated, ingredients, process. Can an air classifying mill be used to formulate SP type of pesticides.

2007-08-22 01:30:45 · 3 answers · asked by khawar k 1 in Agriculture

What exatly is a compound locus in plane geometry?

2007-08-22 01:30:30 · 0 answers · asked by journey 1 in Mathematics

The sequence {a(n):n=1,2,3,....} is defined by: a(1)=20 ,
a(2)=30, and a(n+2)=3a(n+1) - a(n), n>=1 find all natural numbers (n) sush that 1+5a(n)a(n+1) is perfect square

2007-08-22 01:29:33 · 4 answers · asked by Anonymous in Mathematics

about space etc

2007-08-22 01:18:24 · 5 answers · asked by Anonymous in Astronomy & Space

Hello,
I'd like to make my own lab power supply with the precise output of 5V for 3 Amps.
I got ahold of an old PC Power Supply and managed to manually turn it on by shorting the green wire to a COM black wire.
When I put my meter to the 5V cable, it indicates an amperage of only 1 Amp. Yet on the power supply it indicates a potential amperage of 10 Amps for 5V.
My question is how I can I get the 3 Amp output.
I intend to use it for a perchlorate production cell and connect the wires to anode and cathode.
Sorry for being so ignorant about that :-)

2007-08-22 01:18:24 · 5 answers · asked by Anonymous in Engineering

2007-08-22 01:16:27 · 2 answers · asked by Neeraj K 1 in Mathematics

2007-08-22 01:14:42 · 5 answers · asked by Michiko B 2 in Chemistry

2007-08-22 01:04:04 · 5 answers · asked by Kristopher W 1 in Physics

I'm having a tough time with three different problems. Thanks for your help!

1. In the equation (1/5)^m x (1/4)^8 = 1/(2(10)^35), what is m? According to the book, m=35. Could you please explain how they got that answer?

2. Two circles with a diameter of 1 are connected by 15 ft. conveyer belt. What is the distance between the centers of the two circles. The answer is supposed to be (15-pi)/2. Please explain.

3. Finally, I'm having problems with addition and subtraction of numbers with exponents. For example, 10^8-10^2 / 10^7 - 10^3. The answer is 10, but is there an easy way to solve this question w/o multiplying it all out on a calculator?

Thanks for your help!

2007-08-22 00:59:25 · 4 answers · asked by siggolfer 3 in Mathematics

true or false?
To be able for the rocket to launch, the thrust must be equal to the gravitational force.

2007-08-22 00:56:36 · 7 answers · asked by Arvelyn A 1 in Physics

about premarital sex::

do you want it to be legal or not?
why??

2007-08-22 00:45:32 · 1 answers · asked by xela r 1 in Chemistry

my name is nithya
earth is a planet , it is sprical in shape

2007-08-22 00:35:07 · 10 answers · asked by Anonymous in Astronomy & Space

specially the knee pain

2007-08-22 00:26:16 · 5 answers · asked by mythili 2 in Medicine

2007-08-22 00:25:02 · 25 answers · asked by Anonymous in Physics

In the course of a fire can DNA be altered? Need this answer for a Fire Investigation Course.

2007-08-22 00:23:13 · 9 answers · asked by dj4visionaries 1 in Biology

just wondering.

2007-08-22 00:11:26 · 8 answers · asked by Anonymous in Biology

why must the flask and glass tubing be dry at start?

2007-08-22 00:10:19 · 3 answers · asked by xela r 1 in Chemistry