Science & Mathematics - 3 December 2007

a 1.00L solution saturated at 25 degrees Celcius with lead(II) iodide contains .54g of PbI2. Calculate the solubility-product constant for this salt at 25 degrees Celcius.

2007-12-03 06:33:49 · 1 answers · asked by thegenuwineone 2 in Chemistry

2007-12-03 06:30:44 · 10 answers · asked by Alexander 6 in Physics

2007-12-03 06:29:09 · 2 answers · asked by puma820 2 in Mathematics

1. have similar chemical properties.
2. are called isotopes.
3. have consecutive atomic numbers.
4. more than one of the above answers are correct.
5. none of the above answers are correct

2007-12-03 06:25:16 · 6 answers · asked by Anonymous in Chemistry

can you see stars all the time through a tlescope or just on certain night s when the sky is righ?? If so what sort of sky should it be? Also when looking at a star does it look like a big ball of light? And are you able to see planets?

2007-12-03 06:24:33 · 7 answers · asked by Anonymous in Astronomy & Space

2007-12-03 06:24:12 · 1 answers · asked by boms 1 in Chemistry

2007-12-03 06:23:20 · 2 answers · asked by Anonymous in Mathematics

Hi,

Ovulation: A process called ovulation releases the secondary oocyte (egg cell) from the surface of the ovary surrounded by layers of follicular cells.

If this secondary oocyte (egg cell) is not _____________ shortly after its release, it will degenerate.

Any help would be much appreciated!!

2007-12-03 06:16:12 · 6 answers · asked by ray 2 in Biology

i mean literally and scientifically

2007-12-03 06:13:28 · 7 answers · asked by Anonymous in Other - Science

1) Nitrogen and hydrogen combine to form ammonia according to the reaction N_2 + 3H_2 -> 3NH_3
What is the volume of hydrogen required to combine with 2.2L of nitrogen?
a)2.2L
b) 4.4L
c) 6.6L
d) 44.8L

2) The percent by weight of water in calcium chloride dihydrate, CaCl_2·2H_2O, is:
a) 16.1%
b) 12.2%
c) 24.5%
d) 32.4%

3) In an acidic aqueous solution (the square brackets [ ] denote concentrations):
a)[H+] is less than [OH-]
b)[H+] is less than 1 x 10^-14 mol/L
c)[H+] is greater than 1 x 10^-7 mol/L
d)[OH-] is greater than 1 x 10^-7 mol/L

If and where possible could you explain it as well? Please and thank you.

2007-12-03 06:12:21 · 2 answers · asked by Anonymous in Chemistry

Find the average of 1/4 and 1/5

2007-12-03 06:11:58 · 11 answers · asked by Bride2Be 4 in Mathematics

May drove to an appointment in the morning and traveled at 50mph. On the return trip her average speed was 40mph and the trip took 1/5 of an hour longer. How far did she travel to the appointment?

I have been playing with it and have no idea how to set it up. Thank you in advance for your help!

2007-12-03 06:10:28 · 4 answers · asked by Gentle One 3 in Mathematics

In my class we have to learn about chemical reactions.

Aqueous ammonia + copper hydroxide.
[&&]
Iron Filings + Copper Sulphate

} what are the chemical reactions for each of them??

2007-12-03 06:09:37 · 2 answers · asked by Anonymous in Chemistry

what percentage of 125 is 25 and how to work it out with a calculator

2007-12-03 06:08:49 · 32 answers · asked by milofrrll 1 in Mathematics

2007-12-03 06:05:41 · 11 answers · asked by autistic24 2 in Physics

2007-12-03 06:05:30 · 6 answers · asked by jim m 5 in Astronomy & Space

2007-12-03 06:04:58 · 5 answers · asked by Anonymous in Physics

Ty in advance x

2007-12-03 06:03:19 · 18 answers · asked by Anonymous in Physics

√27 -2/3

Thanks for your help!
It's really appreciated.

2007-12-03 06:01:43 · 3 answers · asked by ♥ ღAngelicaღ♥ 2 in Mathematics

Does anyone know all the contraindications and precautions for TENS units. I know it differs from regular E-stim.

2007-12-03 06:00:49 · 3 answers · asked by TAZZZZ7 1 in Medicine

2007-12-03 06:00:13 · 63 answers · asked by Anonymous in Earth Sciences & Geology

Find R.

1/r = 1/100+1/150+1/200

2007-12-03 05:58:35 · 7 answers · asked by Bride2Be 4 in Mathematics

Can u please help me answer these questions?

http://img229.imageshack.us/img229/5973/scankn3.jpg

2007-12-03 05:55:35 · 2 answers · asked by Anonymous in Chemistry

Im in an astronomy class and i'm TOTALLY LOST. I cant find the answers to any of my questions online. Anyone here really good at astronomy??? I have to pass this class to graduate!! :-(

Are nearby stars generally high or low luminosity stars?

2007-12-03 05:52:17 · 10 answers · asked by Tafe 1 in Astronomy & Space

1. all chlorine atoms have a mass of 35.45 amu.
2. some, but not all, chlorine atoms have a mass of 35.45 amu
3. 35.45 amu is the upper limit for the mass of a chlorine atom
4. more than one of the above answers are correct
5. none of the above answers are correct

2007-12-03 05:52:15 · 5 answers · asked by Anonymous in Chemistry

Jim has a total of 50 coins. Some are nickles and some are dimes. Altogether he has $4.15. How many dimes doe he have? How many nickels?

2007-12-03 05:45:27 · 3 answers · asked by Jessica G 1 in Mathematics

i know that when the water evaporates from your skin which draws heat away from ur body, making u feel cold
but y does it draws heat away from ur body?

2007-12-03 05:44:39 · 10 answers · asked by froggy 2 in Physics

2007-12-03 05:42:40 · 14 answers · asked by im the golden child 2 in Paranormal Phenomena

info on these jobs?

2007-12-03 05:39:59 · 3 answers · asked by Anonymous in Chemistry

What is the measure of the third exterior angle?

2007-12-03 05:39:06 · 2 answers · asked by Anonymous in Mathematics