Science & Mathematics - 10 December 2006

I really don't understand this question:
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In a 1L flask filled with NO2 at 1 atm presure, the content of dinitrogen tetroxide was 0.00027 mol after 15 s. Calculate the reaction rate. In a second experiment, at 2 atm of pressure, the N2O4 content after 15 s was 0.00108 mol. Write the rate law.

2006-12-10 00:59:33 · 1 answers · asked by Anonymous in Chemistry

2006-12-10 00:58:03 · 4 answers · asked by Tina 1 in Botany

Here is a Simultaneous Equation, I made up...

2x + y = 1
4x^2 +y^2 = 5
I solved it!... But can you?
Show your working....
10 points for correct answer...

This is NOT my homework..

2006-12-10 00:57:33 · 5 answers · asked by Miss LaStrange 5 in Mathematics

2006-12-10 00:52:59 · 7 answers · asked by mischievous_little_minx2002 1 in Physics

2006-12-10 00:50:42 · 5 answers · asked by Anonymous in Mathematics

A fluid of unknown density floats a .25m x .1m x .02m block of wood weighing .35kg. The block has .002m of its smallest side above the surface of the water. What is the density of the block? What is the density of the fluid? I found the density of the block to be 700 kg/m^3. Is this correct? And how do you find the density of the fluid?

2006-12-10 00:49:51 · 1 answers · asked by thestral 1 in Physics

http://img185.imageshack.us/my.php?image=1sr9.png

2006-12-10 00:49:45 · 11 answers · asked by Anonymous in Botany

2006-12-10 00:49:42 · 6 answers · asked by Armah K 1 in Mathematics

My professor showed our class how 0.999999... could equal to 1, but i was confused. Can anyone explain to me how 0.999... equal to 1?? I have to prove this on my midterm next week.

2006-12-10 00:48:45 · 6 answers · asked by Anonymous in Mathematics

I need to know the land use of italy and possibly find a land use map of italy. And what is the site and situation? damn homework

2006-12-10 00:48:26 · 1 answers · asked by cmcartersmovies 2 in Geography

What's 2 plus 5 times 67 divided by 3 plus 45 minus 23????

2006-12-10 00:47:31 · 9 answers · asked by Teeeheee 2 in Mathematics

ok well i bought about 4 avarage sized cans of playdoh because i needed it to make a 3D model of DNA but i am having a lot of trouble making a double helix because the playdoh isn't very well EVEN WITH TOOTHPICKS!!! i have tried just toothpick with play dough and then i tried taking two toothpicks ,covering them with playdoh and then tried just one toothpick not using much playdoh, but nothing seems to work!! what do i do? should i change my materials? if i should, what should i use? if you have found anysites or any pictures that could help me with my situation..pla post them...

2006-12-10 00:46:32 · 3 answers · asked by Anonymous in Biology

2006-12-10 00:45:47 · 3 answers · asked by Anonymous in Astronomy & Space

Is calcium brittle? And when I mean brittle it means easy to be broken.

2006-12-10 00:42:48 · 6 answers · asked by Ivana 2 in Chemistry

2006-12-10 00:38:45 · 9 answers · asked by gourshweta 1 in Mathematics

how does waving a piece of paper or turnin on a fan make warm air in the room go cool if the air in the room is already warm

2006-12-10 00:37:20 · 15 answers · asked by francy 1 in Other - Science

we need to pass an investigatory project for our chemistry class,and i'm losing hope in finding a good one, 2 of my proposals have been rejected... can you give some ideas? i would really appreciate it, thanks!

2006-12-10 00:37:01 · 1 answers · asked by jean 1 in Chemistry

Very roughly - an approximate time scale is fine (are we talking hundreds, thousands or millions of years?) Heh...sorry I'm very ignorant!

2006-12-10 00:34:34 · 2 answers · asked by L.A.U.R.E.N 1 in Geography

Can anyone explain to me how to solve the equations 2x+4y=6 and 4x-3y=-10 simultaneously???
Using the Chinese method that is.
x

2006-12-10 00:31:08 · 5 answers · asked by Anonymous in Mathematics

2006-12-10 00:30:37 · 2 answers · asked by harhar 1 in Biology

2006-12-10 00:28:42 · 6 answers · asked by HARISH KUMAR R 1 in Physics

Simple question. Black holes, such as the super massive black hole at the center of tthe Milky way, are believed to be super dense mass. The term "Hole" illicites a lot of confusion. So. Are they solid matter?

2006-12-10 00:25:10 · 12 answers · asked by nick o 2 in Astronomy & Space

2006-12-10 00:24:34 · 1 answers · asked by harhar 1 in Biology

i think so because thereare these thingamabobs called extremists, they are little bacterias that live in really really hot or cold places, so couldnt they live on venus or pluto or something then grow bigger and become multicellular and smart or something?

gosh, i am so smart...i like to ask questions about life and how it began (i dont belive in super-human-beings like god).

2006-12-10 00:17:33 · 7 answers · asked by Kim 4 in Astronomy & Space

2006-12-10 00:01:10 · 10 answers · asked by Anonymous in Mathematics

2006-12-10 00:00:38 · 7 answers · asked by shovelhead 1 in Earth Sciences & Geology