Science & Mathematics - 23 November 2007

An alcohol is 64.81% C, 13.60% H, and 21.59%. O by mass. Another experiment shows that its l11ol~cu'ar weight is approximately 74 amu. What is the molecular formula of the alcohol?

2007-11-23 09:20:11 · 3 answers · asked by mohamed r 1 in Chemistry

I don't just mean the earth itself but all the things on it also. For example there is now millions of cars and houses but they all came from raw materials from the earth. I guess some of the oceans have evapourated a bit but does that water come back to earth???

2007-11-23 09:19:07 · 20 answers · asked by Anonymous in Earth Sciences & Geology

speed equal to magnitide

2007-11-23 09:18:43 · 2 answers · asked by Anonymous in Physics

2007-11-23 09:18:28 · 3 answers · asked by Anonymous in Physics

scalars & vectors and Kinematics

2007-11-23 09:17:27 · 3 answers · asked by Anonymous in Physics

x square + 8x +16 /5x+20/ x square - 16 / 5

2007-11-23 09:17:11 · 2 answers · asked by Anonymous in Mathematics

I am studing for my A-Levels in Chemistry, Biology and French at the moment. I am thinking about studing for a degree (MSc) in Chemistry with French at the University of Birmingham.

I was wondering what kind of jobs would be open to me with this qualification? especially in France?

or would Biochemistry with French be better?

Thanks

2007-11-23 09:17:06 · 5 answers · asked by Adam! 1 in Chemistry

Evaluate

squareroot of -100

if possible. If it is not possible, please explain why

2007-11-23 09:15:17 · 18 answers · asked by meme 1 in Mathematics

factor completely if the polynomial cannot be factored write "prime''

2007-11-23 09:15:16 · 7 answers · asked by Anonymous in Mathematics

Simplify. Express your answer in simplified radical form

2(squareroot of 12) + 4(squareroot of 27)

2007-11-23 09:13:13 · 3 answers · asked by meme 1 in Mathematics

A European country - Holland or Belgium, I think - fired a key meteorologist for failing to predict a terrible storm in which over 100 citizens lost their lives.

2007-11-23 09:12:09 · 12 answers · asked by FRANsuFU 3 in Weather

I am not sure how to do this, if someone could help me with the steps it would mean a lot. Thanks


Solve by completing the square. Express your answer in simplified radical form.


4x^2+2x-3=0

2007-11-23 09:09:46 · 3 answers · asked by meme 1 in Mathematics

I burst into tears after watching the horrible hidden cameras of humans who rip the skin off off animals and watch them literally cry with pain, how they lay fuzzy little animals down and stomp on their heads, or cut the noses and tails off of little pigs for entertainment or even take the ends of rifles and ram them through the gates of lions and tigers to bash their teeth while laughing hysterically....What the f**k is wrong with these people? I don't give a s**t if im a PETA fan or not but this unnecessary horrible cruelty has to stop.....how...please....how???

2007-11-23 09:05:31 · 8 answers · asked by Anonymous in Zoology

just curious.

2007-11-23 09:04:17 · 1 answers · asked by smarter_child4 1 in Biology

2007-11-23 09:01:11 · 2 answers · asked by s_engelman10 1 in Chemistry

Why is it necessary to warm a thermometer before placing it into solutions
How does sodium carbonate soften hard water?
Other than a leak, what could be interfering with the flow of water

2007-11-23 09:00:42 · 2 answers · asked by bklynchic_28 2 in Chemistry

factor completely
if polnomial cannot be
factored write "prime"

2007-11-23 08:54:03 · 6 answers · asked by Anonymous in Mathematics

2007-11-23 08:53:11 · 0 answers · asked by nevada 1 in Mathematics

2007-11-23 08:51:58 · 1 answers · asked by ♥ 6 in Biology

Most chemical reactions occuring in a living cell depend on the prescence of an inorganic compound known as:
1) water
2) maltose
3) glucose
4) starch
why? thanks so much for answering me in advanced

2007-11-23 08:51:33 · 3 answers · asked by Anonymous in Biology

2007-11-23 08:49:08 · 4 answers · asked by Nicole D 1 in Mathematics

Well, I'm doing a project on space spinoff products and I need some information on virtual reality as a space spinoff product...Help...:)Can you list some different space spinoff products or websites that I can find many on..??Thanxxs...

2007-11-23 08:48:07 · 2 answers · asked by 2~k~r~i~s~p~y 1 in Astronomy & Space

The astronauts of the Apollo 13 mission to the moon were almost lost in space due to the explosion of a valve on their primary oxygen generator. The lives of the astronauts were threatened by increasing concentrations ofc co2 in the space craft. Gaseous co2 can be absorbed from the air in a spacecraft with open canisters that contain solid lithium according to the following eqn
2 LIOH +CO2------>LI2 CO3 + H2O
If a canister absorbed 100.0grams of CO2 from the air that resulted in the production of 148.5grams of LI2 CO3, what was the percent yield for LI2 CO

2007-11-23 08:47:19 · 6 answers · asked by jamie d 2 in Chemistry

2007-11-23 08:45:42 · 2 answers · asked by Dave 1 in Zoology

If 74.30 g of HCL were produced from 2.13 g oh H2 and an excess of Cl2 according to the reaction:

H2 + Cl2 ------> 2HCl

What was the percent yield of HCl?

I got an answer that is slightly off what the answer key says. If the problem says "excess of Cl2", doesn't that mean H2 is the limiting reactant?

2007-11-23 08:44:38 · 2 answers · asked by Anonymous in Chemistry

Objective: The objective of this hands-on project is to create an atomic model that demonstrates a physical property we discussed in this class. The following are suggestions:

a) Stiffness
b) Thermal conductivity
c) Anisotropy in elastic properties
d) Electrical conductivity
e) Melting
f) Thermal expansion

2007-11-23 08:43:21 · 1 answers · asked by Anonymous in Engineering

(x^2/x-3)-(9/x-3)

2007-11-23 08:42:06 · 2 answers · asked by shawntae6513 1 in Mathematics

I am making a hand cannon for my physics project. Today I got some steel pipe and wood but the problem is obtaining the chemicals. When I nonchalantly asked the pharmaceuticals clerk if they sold potassium nitrate (KNO3) I was promply asked to leave. So where can I get sulfur, potassium nitrate? Also, will activated carbon for an aquarium filter work in place of charcoal? Is it illegal to make gunpowder in Canada?

2007-11-23 08:41:51 · 5 answers · asked by Anonymous in Chemistry

4 2 3

2007-11-23 08:39:57 · 5 answers · asked by SUSAN S 1 in Geography

Is a alkaline storage battery a primary battery or seconday battery?

2007-11-23 08:38:49 · 2 answers · asked by Anonymous in Engineering