Science & Mathematics - 21 November 2007

I need to write a balanced chemical equation for the reaction used to calculate the standard enthalpy formation of CaCO_3.

Thanks in advance.

2007-11-21 21:13:28 · 1 answers · asked by hobiesailor07 1 in Chemistry

needs some help with this one... i keep getting 795.1... it doesnt list if the molecules are liquid, solid, or gas so im not sure on all the enthalpy values. I could really use someones help. Thanks in advance.

2007-11-21 21:09:30 · 1 answers · asked by hobiesailor07 1 in Chemistry

2007-11-21 21:08:34 · 5 answers · asked by Anonymous in Chemistry

Im freaking out cuz everyone around me is telling me that the end of the world is going to happend in december 21 or 23 and im like freaking out because im only 18 im not ready for the end of the world to happen right now and what does it mean when they say that the earth is going to allign with the milkyway?? and the sun is going to exploid and im also hearing a big astroid is going to kill us all im scared!!!

2007-11-21 21:08:31 · 17 answers · asked by Anonymous in Astronomy & Space

2007-11-21 21:05:06 · 10 answers · asked by bihari g 1 in Zoology

CH3OH --> CO + 2H2.

For a given sample of CH3OH, the enthalpy change on reaction is 17.5kJ.

2007-11-21 21:01:45 · 1 answers · asked by hobiesailor07 1 in Chemistry

Calculate the amount of heat transferred when 44.0 g of CH_3OH (g) is decomposed by this reaction at constant pressure.

Find Delta H which will be in kJ.

CH3OH --> CO + 2H2 for reaction Delta H +90.7 kJ

2007-11-21 20:59:57 · 2 answers · asked by hobiesailor07 1 in Chemistry

IS RESERCH UR FIRST PRIORITY? DO U get LOST IN THE WORLD OF SCIENCE??PLZZ SHARE WITH ME.

2007-11-21 20:28:10 · 4 answers · asked by STARFIRE 2 in Other - Science

if yes, how? iv never observed anything like that. if not, then why are they classified as mammals?

2007-11-21 20:20:34 · 10 answers · asked by cordite 1 in Zoology

Find the largest positive integer n for which n! can be expressed as the product of n-3 consecutive positive integers. For example 6! can factorial can be expressed as the product of 6-3 = 3 positive integers, namely 8, 9, and 10 (6! = 8*9*10).

Source: 1990 AIME #11

2007-11-21 20:10:02 · 4 answers · asked by absird 5 in Mathematics

2007-11-21 20:01:40 · 4 answers · asked by bombaelly 1 in Biology

2007-11-21 19:56:00 · 1 answers · asked by connie m 1 in Chemistry

2007-11-21 19:54:20 · 4 answers · asked by abanti 1 in Botany

This world, the one that gives us shelter from the UV, the coldness of space.The one world the lets us live on, and helps us through our daily lifes. The one world that gives us the oxygen, food, and water. The only planet that looks like a blue barry in space. It gives us so much wonder, and beautiful scenery. It also give us millions of Memorys. Why Must we trash it and pollute it? Our world is dieing and we are going with it, If people don't stand up and help. Why can't people help our world out? Don't live the World in filth, live the world in wonder.

2007-11-21 19:49:56 · 3 answers · asked by Adriany 1 in Earth Sciences & Geology

Tuatara have what is believed to be a third eye called parietal eye, does anybody know what this third eye is used for? or what scientists believe it is used for? I need the info for an extra credit assignment...

2007-11-21 19:41:55 · 3 answers · asked by hui 1 in Zoology

k my math teacher is such a jerk he comes in before class and talks to the students about random stuff then starts the class by writing a headline about what we've been doing last time and asking us what we know about it. So some students say different things and he sums it up and points to a problem that we don't know yet or an element we haven't covered yet and then he like leads the class through a proof or an example and asks us what we think happens next and like asks us what we think about that proof and where the big ideas in the proof were. Then he runs through an example and sets the good students a problem they can work on in class while he does another example for those who needs to see another example before they get to work on the problems too. He sets alternative harder questions people can choose to work on instead if they want to. He always allows questions to be asked and always answers them. He never sets reading homework and still everyone learns math. WHAT A JERK!!!

2007-11-21 19:33:24 · 13 answers · asked by Todd 1 in Mathematics

When the sun’s angle of elevation is 30°, the shadow of a post is 6 ft. longer than when the angle is 45°. Find the height of the post.

2007-11-21 19:28:49 · 5 answers · asked by Peter 1 in Mathematics

2007-11-21 19:28:46 · 4 answers · asked by Paradromer 1 in Mathematics

ok what is the bfe and net ionic for the reaction of AgCl and HCl?

how about the reaction of phosphine gas and boron trifluoride gas?

2007-11-21 19:22:42 · 1 answers · asked by missingfeet 2 in Chemistry

he riside in camiling tarlac

2007-11-21 19:21:53 · 4 answers · asked by Anonymous in Paranormal Phenomena

I'm afraid of death, since death means that I will forever cease being, and even for another billion trillion gazillion years, there WILL NOT be "me" again. There's no waking from this eternal sleep. Indeed, there'll never be me again, wiped away from existence, decomposed, gone. It will mean that I'll never experience the riches of the Earth, the people, love, laugh, cry, reading books, playing games, displaying emotions etc etc. and ALL THAT will be gone. It will be a state of "being" before one's birth! I realize that I won't even have the feeling of being scared nor of being in a void or blackness (I won't even have a sensation of blackness or the sensation of being peacefully sleeping or resting, b/c even being sentient of that isn't true death). Even living in discomfort or pain would be better than not experiencing anything at all. Nothing is scarier than pure nothingness.

I want to believe: as humans we can live in a technologically-advanced age, no war, and being immortal??

2007-11-21 19:15:39 · 8 answers · asked by Anonymous in Medicine

2007-11-21 19:12:43 · 3 answers · asked by carlaann12 1 in Mathematics

2007-11-21 19:04:22 · 3 answers · asked by Anonymous in Engineering

Determine whether the two lines l1 : (3,2,3,-1) + t(1,6,1,-1) and l2 : (1,0,1,1) + t(1,-3,-4,2), intersect in R4 , and if so, find the intersection point.

2007-11-21 18:59:42 · 3 answers · asked by Stevo H 1 in Mathematics

2007-11-21 18:57:31 · 4 answers · asked by carlaann12 1 in Mathematics

I saw a project where you can incorporate a serial GPS device with an LCD on a microcontroller I believe. It seems interesting to try but I was wondering if you had to pay some company monthly to provide your chip with GPS information? Or is it just out there and avaliable to everyone? Actually my main goal is to have GPS on a budget as I get lost very easily in my own city and do not feel like paying the $80 per month for a GPS cell phone like I had planned. Any thoughts or suggestions?

2007-11-21 18:54:23 · 6 answers · asked by Jerome54 5 in Engineering

i just took 100 of it

2007-11-21 18:52:36 · 3 answers · asked by Cocaine 2 in Medicine

2007-11-21 18:50:54 · 9 answers · asked by Sujisnuffle 1 in Mathematics

I always thought arthropods could not get that big, because of their method of oxygen transport. They have no lungs. How could these 8-foot-long arthropods get enough oxygen to survive?

2007-11-21 18:50:29 · 1 answers · asked by The First Dragon 7 in Zoology

I have this <1% label of one certain liquid in a solution. Does it mean there is more or less than 1% of that liquid? This is a simple question, but I just am not sure about the meaning...

My guess is that there is more than 1% of that liquid.

2007-11-21 18:48:28 · 5 answers · asked by Anonymous in Other - Science