Science & Mathematics - 27 September 2007

2007-09-27 15:35:33 · 3 answers · asked by jorgevides1 1 in Chemistry

How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

2007-09-27 15:34:33 · 1 answers · asked by Giulio M 5 in Chemistry

Are you glad to see October about to start? I am, I live in N. Kansas, this year it has gotten in the low 100's, thank goodness for fall!

2007-09-27 15:33:28 · 7 answers · asked by Anonymous in Weather

A piece of copper alloy with a mass of 86.0g is heated from 30.0c to 47.5c. During this process, it absorbs 521J of energy as heat?

What is the spefic heat of this copper alloy in J/g-K?
How much energy will the same sample lose if it is cooled to 24c (in J)?

2007-09-27 15:32:36 · 1 answers · asked by Anonymous in Chemistry

What 3 elements do all carbs contain? Please help!

2007-09-27 15:30:08 · 9 answers · asked by linda 2 in Biology

THIS IS A SCIECE QUESTION I HAVE IN CLASS AND I REALLT NEED HELP...PLZ HELP!!

2007-09-27 15:29:06 · 7 answers · asked by *BaBiI gUrL* 1 in Botany

ok well i get like 70 pts of extra credit if i find an ansewer to this so here i go...what would 2 liquids do if they have the same density but arnt soluable..........which one would go on top of each other or what i need to know

2007-09-27 15:28:56 · 3 answers · asked by mwoodruff052893 1 in Chemistry

Hg2 2+ and PO4 3-

2007-09-27 15:28:26 · 1 answers · asked by Anonymous in Chemistry

i know about survival of species, and natural selection. but why? if we all have a common ancestor, how did it split and become more?
what drove that to become more complex and multiply? what was the point? why does life continually get complex... is there any reason as to why it would? and if so what is driving this mechanism...?

2007-09-27 15:27:01 · 7 answers · asked by Chemical Coltraine 2 in Biology

i am suppose to wirte about how the scientist thought the atom evidence has changed
plz help thanks
♥Michelle♥

2007-09-27 15:26:27 · 1 answers · asked by <3 3 in Chemistry

WELL I HAVE THIS QUESTION IN SCIENCE CLASS AND I HAVE NO IDEA!! PLZ HELP!

2007-09-27 15:25:43 · 1 answers · asked by *BaBiI gUrL* 1 in Chemistry

•Please rank the following from smallest to largest; 55cm³, 12.3mL, 6.5 L, 0.2m³, and 23 mm³

2007-09-27 15:24:39 · 1 answers · asked by Anonymous in Chemistry

How do u find that out?

2007-09-27 15:21:04 · 4 answers · asked by Lime Green Queen 2 in Chemistry

I am using wavepad and using my laptop to get some EVP's but i aint getting any.. I am using inbuilt microphone.. Well the quality is good as i Amplify the sound file by almost 600% to listen to everything clearly that has been recorded.

I live in India. Do Ghosts talk through EVP in USA only? Or does EVP's only exists in USA?

Am i doing anything wrong that i am not getting any EVP's?

Could you please tell me how to call Ghosts and ask them to produce EVP?

Thanks for your time everyone :)

2007-09-27 15:18:41 · 9 answers · asked by Anonymous in Paranormal Phenomena

a^2-b^2 = 33
a^3-b^3= 817

what is a+b equal to

2007-09-27 15:17:35 · 3 answers · asked by jennifer 2 in Mathematics

(a) surrounds the Nucleus
(b) surrounds the mitochondria
(c) consists of 2 membranes
(d) all of the above

this is my last homework problem please explain your answer.
I don't understand..

2007-09-27 15:17:31 · 2 answers · asked by soccermom71968 1 in Biology

6x^2+5x-1
x+2

six x squared plus five x minus one
over x minus two

I am not getting a remainder

2007-09-27 15:17:06 · 2 answers · asked by Nanna2 1 in Mathematics

2007-09-27 15:16:30 · 3 answers · asked by . 1 in Mathematics

whats your opinion of parallel universes.

2007-09-27 15:16:03 · 9 answers · asked by Mercury 2010 7 in Astronomy & Space

A student throws a ball vertically upward such that it travels 6.40 m to its maximum height. If the ball is caught at the initial height 2.00 s after being thrown, answer the following.
(a) What is the ball's average speed?
wrong check mark m/s

(b) What is its average velocity?
wrong check mark m/s

2007-09-27 15:14:46 · 1 answers · asked by k 2 in Physics

What are the two substances that make up a lipid? Please help!

2007-09-27 15:12:26 · 7 answers · asked by J 1 in Biology

a few actually

1. sqrt(x) is this just x?
2.(3/sqrt(x)) what is that one? zero??
3. 6sqrt(x) would that be just 6x??

2007-09-27 15:10:59 · 3 answers · asked by m_carl 1 in Mathematics

What are nucleic acids made of? Please help!

2007-09-27 15:10:47 · 7 answers · asked by J 1 in Biology

A protocol calls for the homogenate to be centrifuged at 16,000 x g for 20 minutes. If the rotor has an average r value of 6 cm, at what rpm must you set the centrifuge? You may use a nomogram or equation to determine the answer

2007-09-27 15:10:12 · 1 answers · asked by Jon P 1 in Chemistry

Why can other plants survive and tomatoes can't?

2007-09-27 15:08:10 · 1 answers · asked by fhjdkd 2 in Biology

for algebra

2007-09-27 15:08:05 · 3 answers · asked by devaughnfrazier 1 in Mathematics

how will this inhibition eventually affect the amount of ATP in the cell?

2007-09-27 15:03:28 · 2 answers · asked by Anonymous in Biology

2007-09-27 15:01:37 · 10 answers · asked by Amber C 1 in Mathematics

Solve each system of equations using matrices. If the system has no solution, say it is inconsistent.

{ 2x + y - z = 2
{ x + 3y + 2z = 1
{ x + y + z = 2

Can you explain how you solve this so I understand?

The solution of the system in the appendix is x = 2 and y = -1 and z = 1

2007-09-27 14:59:55 · 2 answers · asked by w s 3 in Mathematics

Hi! I'm a sophomore in High School and we use the Interactive Math Program textbooks at my school. The book itself isn't bad but the thing is, it focuses 99% of its attention on understanding and not on actual practice (like no praticing 2X+4=10).

I took the PSAT last year and nothing I learned in that book was on the test at all! I'm really worried about my future in taking the ACT and the SAT. Do you guys have any suggestions (links? advice?)

2007-09-27 14:58:55 · 1 answers · asked by Anonymous in Mathematics