Science & Mathematics - 22 November 2007

(hint. consider such a sequence u_n whose limit is say L and assume that infinite number of terms satisfy say u_p someone please explain to me the procedure. thanks alot in advance!!

2007-11-22 09:25:02 · 2 answers · asked by mhthekidd 2 in Mathematics

I have been given a graph of the amount of solubility of two substances. I am not sure how to complete these questions. Could someone just tell me what I am supposed to do, or show me a formula that I can use to solve them? I know it is hard without the graph. Thanks :)

1) What mass of substance A would you need to add to 325g of water to saturate the solution at 25 C?

2) 27g of substance A is added to 60g of water. At what temperature will the solution be saturated?

3) A saturated solution in 68g of water is cooled from 70 C to 55 C. Waht mass of the solute will crystalize out?

4) If you had a saturated solution in 30g of water each of substance A and substance B, what would be the difference of solute at 45 C?

5) You have a saturated solution in 140g of water of substance A at 20 C. What mass of water must you have to contain a saturated solution of substance B at that temperature, given the same amount of solute?

I really just need formulas, if possible. Thanks! :)

2007-11-22 09:15:46 · 2 answers · asked by Marie 2 in Chemistry

2007-11-22 09:04:37 · 5 answers · asked by Anonymous in Physics

For instance if we have CaO+H2O->Ca(OH)2
and want to find out how much caclium hydroxide will be
produced when 10g of calcium oxide reacts with 3g of water?
What is the reason/s why we cannot do a direct gram comparison instead of converting to moles to find the limiting reactant? Please help thanks!

2007-11-22 09:03:55 · 3 answers · asked by Gideon 1 in Chemistry

why not just cool the engine with the air directly like in the early vw beetles?

2007-11-22 09:03:17 · 9 answers · asked by Anonymous in Engineering

In days, weeks, or months?

2007-11-22 08:57:11 · 6 answers · asked by Anonymous in Mathematics

beside tomato, banana, grape give an example of a berry

2007-11-22 08:57:11 · 2 answers · asked by star baller 360 5 in Biology

2007-11-22 08:51:07 · 9 answers · asked by dhernandez91 1 in Mathematics

Bonjoir everyone! Right now it is probally snowing in your areys but in Neuilly-sur-Seine(Paris,France) it hasn't. I am doing a progect on how many peeple,(in whatever country) where you live , have it snowing already. Here it is foggy but that is pritty much it!

P.S: excuse my english it is horrid, but I am learing!

2007-11-22 08:50:01 · 6 answers · asked by SHAKEIT 2 in Weather

Why is any number raised to the first power = the same number?

Sample: x^1 = x, right? Now, why is that?

2007-11-22 08:49:50 · 7 answers · asked by Anonymous in Mathematics

2007-11-22 08:49:38 · 7 answers · asked by Anonymous in Earth Sciences & Geology

I am doing a biology project for school and I was growing bacteria from my hands in a culture dish. I restricted access to oxygen for one of my petri dishes, but the bacteria colonies are still growing. Either I did it wrong, or there are anaerobes on our skin, right?

2007-11-22 08:46:54 · 4 answers · asked by kiddo 2 in Biology

2007-11-22 08:46:06 · 1 answers · asked by Oscar A 2 in Mathematics

this is science research for the taiga forest

2007-11-22 08:41:18 · 1 answers · asked by Anonymous in Botany

beside peach, cherry, coconut, and olive give an example of drupe

2007-11-22 08:40:04 · 3 answers · asked by star baller 360 5 in Biology

Let f(x) = x² − 1. Evaluate the following:

(a) f(x^2 + 3x)

(b) f(sqrt{x^2 - 9}/(x-3)

2007-11-22 08:39:32 · 2 answers · asked by Anonymous in Mathematics

Find the midpoint between (a/2, sqrt{3a}/2) and (x/3, sqrt{3y}/3)

2007-11-22 08:35:03 · 4 answers · asked by Anonymous in Mathematics

what is the difference between a carpel and a pistil?

2007-11-22 08:27:08 · 1 answers · asked by star baller 360 5 in Biology

My question is ; What mass of calcium chloride is produced from 2 grams of calcium carbonate?

I know that I have to write down the 2 formulas which would be Calcium Chloride > CaCl2 and Calcium Carbonate CaCO3, and then add up there relative atomic masses and add them up, they then should be equal, but when I add them up Calcium Chloride ends up as 112g and Calcium Carbonate 100g. They need to be equal can anyone tell me where im going wrong? Thanks :)

2007-11-22 08:22:57 · 2 answers · asked by Anonymous in Chemistry

2007-11-22 08:18:42 · 5 answers · asked by Jose E 1 in Astronomy & Space

The question is...
A proton, neutron and electron, all with the same velocity, pass between the poles of a permanent magnet. Which is deflected most? And why? I really have no idea except i dont think its neutron. :(

2007-11-22 08:17:51 · 2 answers · asked by Anonymous in Chemistry

On the back of an antibacterial soap that I bought, it says that it contains 0.6% Triclosan. What is meant by that. Is it 0.6 % of the bottle is troclosan or is it something like weight/volume (0.6g/Liters)

thanks a bajillion!!

2007-11-22 08:15:11 · 1 answers · asked by Crazyfred02 1 in Chemistry

How do I write x+1>-2 and x+1<6
without using and? Could you please explain it? I don't get how to write it without and.

2007-11-22 08:06:42 · 6 answers · asked by Anonymous in Mathematics

What is the best country and why?
(Because yahoo answers is 99% americans, USA is not an acceptable answer)

2007-11-22 08:05:19 · 10 answers · asked by Anonymous in Geography

The question from the text:

Are the following substances electrolytes or non-electrolytes? Write equations to illustrate your answers.

I'm unsure about a couple of them. I'd like to just be sure I'm going about this correctly:

substance: C2H5OH(l) in water
My equation: C2H5OH(l) --[in water]--> C2H5OH(aq); non-electrolyte.

substance: O2(g)
My equation: O2(g)--[inwater]-->O2(g); non-electrolyte

2007-11-22 08:01:58 · 3 answers · asked by glurpy 7 in Chemistry

the sum of the squares of the numbers from 1 to 9 is 285 but i need to know if it is posible to obtain another 9 number combination that the sum of their squares is 285

2007-11-22 08:01:38 · 2 answers · asked by Armando M 2 in Mathematics

jes joined me up wit a paranormal investigation group.
what should I bring with me?
tape recorder? and camera ..... what else?

2007-11-22 07:54:49 · 16 answers · asked by Auntie Marie SueB 3 in Paranormal Phenomena

2007-11-22 07:53:58 · 8 answers · asked by henryfroch 1 in Engineering

2007-11-22 07:47:26 · 2 answers · asked by abhin t 1 in Mathematics

2√48 x 3√24 = ?

2007-11-22 07:43:49 · 6 answers · asked by CLUELESS! 1 in Mathematics