Science & Mathematics - 13 July 2006

An excess of Calcium nitrate (NO3) was added to 50.0 mL of sodium fluoride, NaF, solution. The mass of the calcium fluoride precipitate, CaF2, produced was 2.93 g. What is the concentration of the Sodium Fluoride solution?
Ca(NO3)(aq) + 2 NaF(aq) ---> CaF2(s) + 2 NaNO3(aq)

2006-07-13 18:40:51 · 2 answers · asked by Anonymous in Chemistry

how fast and for how long

2006-07-13 18:34:32 · 6 answers · asked by Anonymous in Physics

Let's say you are a little ant....and you're chillin' in a room looking at this MAGNIFICENT adult human, that just towers over you.....how on earth would you describe this large, intelligent looking "being"?

2006-07-13 18:33:07 · 13 answers · asked by ~ xMx ~ 2 in Other - Science

2006-07-13 18:25:42 · 24 answers · asked by jaaaaaaa 2 in Other - Science

Dear, I want to store proteins. Is it better to store my proteins (IgM) under 4 celsius degree or -20 celsius degree? Is there any way to improve the proteins' stablity in solution for preservation?

2006-07-13 18:25:37 · 3 answers · asked by Ho tran nhat chuong 1 in Biology

2006-07-13 18:18:01 · 3 answers · asked by armennassir 1 in Geography

Can you simplify the algebraic multiplication shown above?
This is a quiz to test your reasoning powers. It's not something I need for homework.
Have fun.

2006-07-13 18:11:12 · 13 answers · asked by actuator 5 in Mathematics

which branch of elect, engineering is in high demmand?????

2006-07-13 18:07:17 · 3 answers · asked by The Apostle 2 in Engineering

A. Before the Civil War
B. During the Civil War
C. After the Civil War
D. Right after the Emancipation Proclamation

2006-07-13 17:55:30 · 1 answers · asked by blazin_cripz_2006_0wner.sheena 3 in Geography

2006-07-13 17:51:08 · 25 answers · asked by Vtang 4 in Astronomy & Space

A - electron
B - beta particle
C - gamma ray
D - alpha particle

2006-07-13 17:49:41 · 4 answers · asked by Anonymous in Physics

2006-07-13 17:45:59 · 4 answers · asked by Anonymous in Physics

anybody know? it was refered to in answer to energy/time previous question

2006-07-13 17:41:45 · 5 answers · asked by Anonymous in Physics

Hey, I'm from the 1800's and who took the horses and where the hell is Abe! Abe, where are ya old friend !

What the heck are those noisy things up in the sky?

Who are all you people looking at me and pressing that fancy telegraph key thing. And whats that other thing your clickin there.
OMG, and you, you're naked, HELP !!! GET ME OUTTA HERE !!!!

2006-07-13 17:41:22 · 3 answers · asked by Anonymous in Other - Science

2006-07-13 17:23:10 · 5 answers · asked by cinabolic 3 in Chemistry

Are the examples of refrigeration devices that contain no moving parts, but are able to cool things very efficiently?
What I had in mind is some kind of simple electrical device or materials that work like a thermocouple in reverse.

You apply a charge, and instead of heating up, it cools down.
Maybe a semiconductor device? Maybe some special materials?

Some creating ideas, links, thoughts are welcome.

Thanx!

2006-07-13 17:19:23 · 7 answers · asked by Anonymous in Engineering

I saw an interesting show on the National Geographic Channel last night and can't stop thinking about the problem.

2006-07-13 17:18:57 · 9 answers · asked by leedogg1981 3 in Zoology

I have been driving for 37 minutes. My displacement is 47.3 meters to the pile of bricks ahead of me. How much must I accelerate before I hit the bricks? Correct answer gets 10 points! (This is a trick question so answer wisely)

2006-07-13 17:16:19 · 9 answers · asked by J D 2 in Mathematics

2006-07-13 17:08:22 · 3 answers · asked by beeze64 1 in Chemistry

2006-07-13 17:07:14 · 21 answers · asked by Issey 1 in Astronomy & Space

2006-07-13 17:05:26 · 9 answers · asked by Anonymous in Geography

Ive read that everything is just energy waves in space (including matter).

What are the implications of this?
Thanx for some openminded and creative thoughts.
----
Some was based on quotes from physicists:

John Wheeler: "There is nothing in the world except empty curved space" and "Matter, charge, electromagnetism and other fields are only manifestations of the curvature of space."

Einstein : 'Mass and energy are both but different manifestations of the same thing -- a somewhat unfamiliar conception for the average mind'.

Shroedinger:"We have to admit that our conception of material reality today is more wavering and uncertain than it has been for a long time. ... Physics stands at a grave crisis of ideas."
----

2006-07-13 17:00:27 · 8 answers · asked by Anonymous in Physics

2006-07-13 16:58:36 · 12 answers · asked by whullinislecity 1 in Engineering

Its just hydrogen (highly flammable) and Oxygen (necessary) for combustion.

2006-07-13 16:58:01 · 8 answers · asked by mfougnie 3 in Chemistry

2006-07-13 16:55:39 · 9 answers · asked by hasek3399 2 in Biology

I need an OD of 6 or 7 at 1064nm and across the IR spectrum

2006-07-13 16:53:18 · 1 answers · asked by NdYag Man 1 in Other - Science

2006-07-13 16:52:50 · 2 answers · asked by Anonymous in Geography

How many named Hurricanes will there be this season?

2006-07-13 16:47:43 · 7 answers · asked by Gret 2 in Weather

2006-07-13 16:46:52 · 29 answers · asked by Michael M 2 in Biology

If you are at 6000 feet in elevation and you get a bottle and collect the thin air from that elevation in an air tight bottle and then go down to a 1000 foot elevation where the air is thick and warmer, would the air in the bottle be cooler because there is less pressure in it and less kinetic energy or would it be the same temperature as the outside air at 1000 feet?

2006-07-13 16:43:17 · 11 answers · asked by Anonymous in Earth Sciences & Geology