Science & Mathematics - 17 January 2007

what is -3+12? and -12+2?

2007-01-17 04:27:37 · 6 answers · asked by jamaicangirl 1 in Mathematics

2007-01-17 04:26:51 · 12 answers · asked by DAVID 1 in Astronomy & Space

2007-01-17 04:26:43 · 5 answers · asked by Ben A 1 in Mathematics

gas laws

V=3,0 dm3
T=20C

what is the temperature if the volume is doubled

2.T=20C
V=4,0 dm3
V of piston above gas=500cm2

for how much does the piston move if gas is heated by 100 C.

2007-01-17 04:24:53 · 1 answers · asked by aly 1 in Physics

or something i didnt mention?

2007-01-17 04:24:33 · 4 answers · asked by Anonymous in Chemistry

2007-01-17 04:23:37 · 8 answers · asked by masterbuilder_one 1 in Engineering

2007-01-17 04:23:20 · 10 answers · asked by Anonymous in Astronomy & Space

In my second semester of college, I'm taking descriptive astronomy. I've always been VERY interested in it, since before I can really recall. I've always looked up at the stars and asked questions about them. I'm worried though, that it may not be what I expect. Do I have reason for this worry, or is it just a case of the "What if's"?

2007-01-17 04:23:17 · 4 answers · asked by lilfireyballofhate 3 in Astronomy & Space

Calculate the heat required to convert 27.9 g of propyl alcohol, C3H8O, from a solid at -147°C into the gaseous state at 111°C. The normal melting and boiling points of this substance are -127°C and 97°C, respectively. The heat of fusion is 86.2 J/g, and the heat of vaporization is 694 J/g. The specific heats of the solid, liquid and gaseous states are, respectively, 2.36, 2.83 and 1.76 J/g/K.

2007-01-17 04:22:03 · 4 answers · asked by Anonymous in Chemistry

1 - Chemical reaction rates vary with the conditions of the change, but nuclear rates do not.

2 - Nuclear decay rates vary with the conditions of the change, but chemical reaction rates do not.

3 - Both chemical reaction rates and nuclear decay rates vary with the conditions of the change.

4 - Neither chemical reaction rates nor nuclear decay rates vary with the conditions of the change.

I want to say 4, but I am not sure.

2007-01-17 04:21:53 · 3 answers · asked by Julia 2 in Chemistry

2007-01-17 04:21:44 · 6 answers · asked by Hellareal 3 in Zoology

How to use Molecular sieves to dry an organic solvent? Also, how to recover the Molecular sieves after use? Thanks for help. Appreciate if can provide related reference.

2007-01-17 04:21:37 · 7 answers · asked by SS 2 in Chemistry

science

2007-01-17 04:19:25 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Assumptions: No physical obstructions. No gravitational interference.

2007-01-17 04:19:18 · 8 answers · asked by Sammy D 1 in Physics

the weather is very mysterious!

2007-01-17 04:17:11 · 10 answers · asked by Crazy Butterfly! 1 in Weather

Please help me with this. Thanks! On a coordinate system, the lines containing two sides of a square have equations y=x and y=x+2. If the points at (0,0) and (0,2) are two of the vertices of the square, write equations for the lines containing the other two sides and find the coordinates of the other two vertices.

2007-01-17 04:16:44 · 4 answers · asked by katerina 1 in Mathematics

2007-01-17 04:14:26 · 8 answers · asked by Anonymous in Mathematics

The options are -
1 - magnetize small particles.
2 - speed up small particles.
3 - slow down reaction products.
4 - reproduce reaction conditions found in nature

Not sure if it was 2 or 4. - Thanks!

2007-01-17 04:12:12 · 4 answers · asked by Julia 2 in Chemistry

2007-01-17 04:11:35 · 10 answers · asked by Roller 2 in Astronomy & Space

Just read in the paper the dolphins are starving and coming to the shore to die, true? Why would they starve, lots of fishes in the ocean, or is it because of the waters contamination?

2007-01-17 04:10:16 · 3 answers · asked by Anonymous in Zoology

2007-01-17 04:10:12 · 9 answers · asked by Anonymous in Other - Science

2+2= ????

2007-01-17 04:07:37 · 4 answers · asked by j.j 2 in Mathematics

This probably is the weirdest and most random question ever, but my little brother keeps asking me, my mum, and my dad, who would win in a fight? A Crocodile? or a Shark? Does anyone have any idea?

2007-01-17 04:07:25 · 31 answers · asked by Anonymous in Zoology

I love animals and would want a career with them. I know that Biology plays a big part in Zoology, but I got a "C" when i took Biology. I also have an "B" in math. The higher math is a bit harder for me.

2007-01-17 04:07:12 · 7 answers · asked by Scarlet B. 1 in Zoology

The half-life of a radioisotope of tritium, or hydrogen-3, is 12.32 years. After about 37 years, how much of a sample of tritium will be left?

1 - one-eighth
2 - one-fourth
3 - one-third
4 - one-half

2007-01-17 04:06:41 · 4 answers · asked by Julia 2 in Chemistry

describe how you would perform the experiment

2007-01-17 04:06:39 · 6 answers · asked by Anonymous in Physics

how do you do the following problem: 3x2+6x using the disributive property? i really need help?

2007-01-17 04:06:04 · 6 answers · asked by jamaicangirl 1 in Mathematics

Scientists seem confident that the rate of expansion of the universe is increasing. I don't believe this, and i want to know if my theory has an flaws to it.

The evidence, as far as im aware, for the universe expanding faster is that the father away from earth we look, the faster galaxies are moving away from us. The galaxies etc. that are billions of light years away are massively red shifted, showing that they are moving away from us at a phenomenal rate.

The thing i dont understand is, these are galaxies billions of light years distant, the light from them has taken billions of light years to reach us. Meaning the light left these galaxies during the 'early years' of the universe. So surely the fact that they are red shifted is because back then, when the big bang was still recent, everything WAS expanding at a phenominal rate, and now, billions of years later, things have slowed down, which is why nearby galaxies dont appear to be travelling away as fast....

2007-01-17 04:05:01 · 8 answers · asked by Johnno 2 in Astronomy & Space

2007-01-17 04:02:41 · 5 answers · asked by Julia 2 in Chemistry

A. Consider the combustion of ethylene, C2H4 (g) + 3O2 (g) --> 2CO2 (g) + 2H2O (g). If the concentration of C2H4 is decreasing at the rate of 0.23 M/s, what are the rates of change in the concentration of CO2 and H2O?

B. The rate of decrease in N2H4 partial pressure in a closed reaction vessel from the reaction N2H4 (g) + H2 (g) --> 2NH3 (g) is 45 torr/hr. What are the rates of change of NH3 partial pressure and total pressure in the vessel?

2007-01-17 04:01:47 · 2 answers · asked by bosox1989 1 in Chemistry