Science & Mathematics - 8 December 2007

What is made when aluminium carbonate reacts with nitric acid?
And what is the chemical formula?

I think so far i have Al2(CO3)3+HNO3 -->?
This formula is not balanced, and i don't know if it's right so far.
x

2007-12-08 08:23:07 · 6 answers · asked by Anonymous in Chemistry

Correct me if i'm wrong:
the Quadratic formula is :

x = -b ± √(b^2 - 4ac) / 2a
?

is that correct?

2007-12-08 08:21:31 · 6 answers · asked by Anonymous in Mathematics

is madagascar part of africa???

2007-12-08 08:17:01 · 16 answers · asked by Anonymous in Geography

1. loga (a/ Square root x) - log a (square root of ax)

2. 120 (ln 5 square root x^3) + ln (3 square root of y^2) - ln (4 square root of 16z^5)0

----

Btw in NUMBER 2, the 5 in the square root of x^3 goes in the left top, and the 3 and the 4 too.


thanks

2007-12-08 08:13:59 · 1 answers · asked by Anonymous in Mathematics

Umm.Yeah.

2007-12-08 08:13:44 · 6 answers · asked by Starstruck in LovE 2 in Chemistry

Solve the system by substitution.
x + 3y = 6
2 x + y = 4

http://i143.photobucket.com/albums/r152/benspargur/graph2.jpg

Thanks in Advance.

2007-12-08 08:12:44 · 5 answers · asked by Superman 2 in Mathematics

i need to know it is for a project.
thanx i appreciate all the answers.


thanx!

2007-12-08 08:12:42 · 7 answers · asked by Afsoun_Nicole_32907 2 in Engineering

Dose anyone know of websites that shows how to separate H2O? Or if any of yall could tell me what I need and/or what to do? Please tell me.

Thank you for your answers.

2007-12-08 08:10:14 · 6 answers · asked by Anonymous in Chemistry

2007-12-08 08:07:25 · 3 answers · asked by Margi 1 in Earth Sciences & Geology

2007-12-08 08:04:57 · 4 answers · asked by azaa 3 in Chemistry

I'm new to teaching chemistry and have a lab with NO manuals or books, but tons of chemicals and other materials.. Thinngs like magnesium sulfate, copper sulfate, citric acid, calcium chloride, copper sulfate solution, etc. The list goes on and on. There are literally 100's of bottles, vials, etc. in the lab. I've obviously done experiments in HS and college . . . but where do I find experiments using chemicals like these, with 7th and 8th graders. I was thinking of copper plating and things like that. But other than that, what can I do to show chemical reactions with these materials? BTW: I was a Bio major and most classes I teach are Bio. I have 2 chem classes. One 7th/ one 8th.

2007-12-08 08:03:26 · 3 answers · asked by N F 4 in Chemistry

2007-12-08 08:03:05 · 3 answers · asked by Anonymous in Biology

who is he
what did he do

2007-12-08 08:02:43 · 5 answers · asked by Anonymous in Astronomy & Space

Please help me with this one, we had a test and no one (!) could figure that problem out. (9th grade physics)
btw I don't live in America so I had to translate it..sorry

object A is released from a top of a building and falls. At the same moment object B is fired from the ground upwards, with a starting velocity that allowes it's apex to be the building height.
When the two bodies pass by, B's velocity is 12.25 m/s .

a. What is A's velocity at the moment they pass by?

b. What is B's starting velocity?

c. How tall is the building?

d. When the objects pass by, what is their height?

And again, sorry if I translated it wrong or something..

2007-12-08 08:00:25 · 3 answers · asked by Anonymous in Physics

A nationality is distinguished by all but which of the following?
1. sovereignty
2.history
3.arts
4.culture

I'm kinda stuck help plz? thanksssssss

2007-12-08 07:55:29 · 8 answers · asked by Imadinosaurawr 1 in Geography

Prove that if x1, x2, x3, x4 and x5 are positive, then
(x1 + x2 + x3 + x4 + x5)2 4(x1x2 + x2x3 + x3x4 + x4x5 + x5x1).

2007-12-08 07:52:25 · 2 answers · asked by Montu K 1 in Mathematics

I really want to know

2007-12-08 07:52:12 · 13 answers · asked by Nicholas b 2 in Astronomy & Space

difference of the squares of the other two sides?
true or false

2007-12-08 07:51:49 · 12 answers · asked by Donny 2 in Mathematics

What exactly are Cartesian Coordinates? I have a question, At what Cartesian Coordinates does the tangent line have slope equal to 5? This is referring to x=ln(t) and y=(t^2)/2+ln(t)

2007-12-08 07:48:25 · 1 answers · asked by deadn00b 2 in Mathematics

If a space shuttle goes into a higher orbit, what happens to the shuttle's period?

2007-12-08 07:48:22 · 5 answers · asked by Anonymous in Astronomy & Space

INstead of walking along two sidesof a rectangluar field, Fran took a shortcut along the diagonal, thus saving distance equal to half the length of the longer side. Find hte length of the long side of the field, given that the length of the short side is 156 meters.

2007-12-08 07:45:20 · 2 answers · asked by swimfairy1 1 in Mathematics

2007-12-08 07:43:47 · 18 answers · asked by Anonymous in Astronomy & Space

I just counted them and there are 200 million galaxies out there. I dunno, kind of makes me feel insignificant. How about you?

2007-12-08 07:40:33 · 8 answers · asked by FRANsuFU 3 in Astronomy & Space

A biochemist studying the breakdown in soil of the insecticide DDT finds that it decays by a first-order reaction with a half-life of 12 yr. How long does it take DDT to decay from 305 ppbm to 17 ppbm in a soil sample ("ppbm" is parts per billion by mass)?

2007-12-08 07:39:21 · 1 answers · asked by socr8711 2 in Chemistry

i just saw it on the phenomenon finale- and they said that it "was a mystery". why is it a mystery?

2007-12-08 07:33:16 · 9 answers · asked by m11y. 5 in Astronomy & Space

2007-12-08 07:32:25 · 7 answers · asked by Anonymous in Zoology

2007-12-08 07:29:40 · 8 answers · asked by Rusty H 1 in Mathematics

2007-12-08 07:28:26 · 4 answers · asked by Anonymous in Zoology

10 points for most thorough and thoughtful answer:

On a hot and humid summer day, say 93 degrees with 85% humidity, if for a split second, it was absolute zero and then back to normal, in the blink of an eye, what would happen? In that time period would all life die or would it be too small of a time increment? This is a hypothetical question, obviously.

2007-12-08 07:27:50 · 7 answers · asked by Anonymous in Weather

I live in WI and we get 'lake effect' snow from Lake Michigan. What causes it? What is it?

2007-12-08 07:24:50 · 4 answers · asked by Therapist 5 in Weather