Science & Mathematics - 26 January 2007

2007-01-26 19:14:05 · 9 answers · asked by chintu 1 in Biology

i treated benzoic acid and acetic acid in the presence of MnO2.
a white product of needle like crystals having mp 112--115 degree centigrad.what will be this product

2007-01-26 19:13:07 · 1 answers · asked by Anonymous in Chemistry

2007-01-26 19:08:38 · 10 answers · asked by spandana r 1 in Other - Alternative

can someone go to this website
http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/gaslaw/boyles_law_new.html

and find the pressure for air, oxygen, hydrogen and helium, when the volume is 10?

When i did that, it was 51.45 for all four gases. Is that correct or is there something wrong with my computer?
thanks.

2007-01-26 19:05:53 · 2 answers · asked by . 3 in Chemistry

2007-01-26 19:02:50 · 8 answers · asked by jayanti p 1 in Geography

It is a dot product question. !p ( p1, p2, p3) those kind....

2007-01-26 18:59:34 · 5 answers · asked by Anonymous in Mathematics

Hi! I'm building a model rocket launch controller and I am confused about something that has been giving me a headache for over a month now.
The device basically completes a circuit when the button is pressed, which heats up the resistance wire in the ignitor which then ignites the engine. My current system is running off of two 9v batteries wired in series and the problem is that when I compare it to the stock system which is just running off of 4 AAs, my system is barely getting the wire to ignite.

What could the problem be? Clearly it's not a matter of the voltage being too low. Do I need more resistance or something? Please help. I'd like to get this worked out so I can use it for my student's rocket launches.

Thanks!

2007-01-26 18:49:13 · 5 answers · asked by nitin00 1 in Engineering

2007-01-26 18:45:58 · 12 answers · asked by Antonio 1 in Earth Sciences & Geology

2007-01-26 18:44:15 · 11 answers · asked by ? 6 in Chemistry

2007-01-26 18:42:16 · 2 answers · asked by miesya_az 1 in Botany

2007-01-26 18:37:57 · 3 answers · asked by wmfte 1 in Earth Sciences & Geology

Anna says, "We three have $100 altogether." Betty says, "Yes, and if you had six times as much and I had one-third as much, we three would still have $100." Carl says, It's not fair. I have less than $30." Who has what? (Dudley)

2007-01-26 18:34:30 · 9 answers · asked by AX 2 in Mathematics

What is and how big is supper atom

2007-01-26 18:34:17 · 2 answers · asked by Mohsen J 2 in Physics

2007-01-26 18:33:44 · 6 answers · asked by i dont have to put a nickname! 1 in Astronomy & Space

By the way, the reaction for the combustion of propane is C3H8(l) + 5O2(g) → 3CO2(g) + 4H2O(g).

And, for that equation ΔH = -2220 kJ/mol.

I greatly appreciate any help!

2007-01-26 18:28:52 · 2 answers · asked by Random G 3 in Chemistry

2007-01-26 18:24:11 · 7 answers · asked by Mo0n 1 in Medicine

A 15.2-kg block rests on a horizontal table and is attached to one end of a (nearly) massless horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 5 m/s in 0.45 s. In the process, the spring is stretched by 0.2 m. The block is then pulled at a constant speed of 5 m/s, during which time the spring is stretched by only 0.05 m. Find the spring constant of the spring.

2007-01-26 18:23:24 · 3 answers · asked by Victor C 2 in Physics

Here is the full equation:

2HCl(aq) + Ba(OH)2(aq) --> BaCl2(aq) +2H2O(l)

Thanks in advance for the help!

2007-01-26 18:15:10 · 1 answers · asked by Random G 3 in Chemistry

Which is the plot of the point with coordinates (–4, 3).
one more
Graph 3x + 2y = 6.
one more
Which is the graph of x = 3.
thanks

2007-01-26 18:13:29 · 6 answers · asked by dee free 2 in Mathematics

2007-01-26 18:12:51 · 5 answers · asked by outkast_33265 1 in Botany

By what kind of bond I mean pure covalent, polar covalent, coordinate covalent, ionic, or metallic? There is one of each of those types of bonds...

2007-01-26 18:06:32 · 3 answers · asked by Random G 3 in Chemistry

2007-01-26 18:03:43 · 1 answers · asked by sparkle 2 in Botany

Calculate the moles of hardening ions in the water sample. Assuming the hardness is due to exclusively to CaCO3, express the hardness concentration in mg CaCO3/L sample.

I do not know how to set this up. My book suggests with an example sort of like this one to use the mv=mv equation. Should I use this or another equation? Please help

thank you

2007-01-26 18:03:17 · 4 answers · asked by wokkie1234 2 in Chemistry

2007-01-26 18:01:53 · 2 answers · asked by sparkle 2 in Botany

#5. A sprinter running at a speed of 12 m/s is approaching the finish line and, in a final burst of willpower, she forces herself to accelerate over the last 3.50 meters of the race. If this period of acceleration lasted for a time interval of 0.20 second, what was the sprinter’s speed as she crossed the finish line?

#6. An object with initial velocity of 5 m/s has a constant acceleration of 2 m/s2. When its speed is 15 m/s, how far has it traveled?

#7. An automobile traveling at a speed of 30 m/s accelerates uniformly to a speed of 60 m/s in 10 s.
a.Acceleration of the car?
b.Distance does the car travel during the 10 second time period?

2007-01-26 18:00:45 · 2 answers · asked by Anonymous in Physics

Antimony-121 has a mass of 120.9038 u
antimony-123 has a mass of 122.9042 u

the atomic mass of antimony from the periodic table is 121.760 amu.
i need to know the percent abundance of the two isotopes.

please show all steps and formulas
thank you

2007-01-26 17:56:00 · 8 answers · asked by I Like Cheese 2 in Chemistry

Only serious answers please...

2007-01-26 17:53:06 · 18 answers · asked by curious 4 in Biology

Is there anyone near Cushman, AR that could give me directions to the Cushman Caves/Blowing Cave?

Thanks

2007-01-26 17:52:04 · 1 answers · asked by cardinalfanusa 3 in Earth Sciences & Geology

2007-01-26 17:51:54 · 2 answers · asked by fire 1 in Engineering

1) The instantaneous velocity is zero but changing
2) The instantaneous velocity is not zero but changing
3) The instantaneous velocity is constant
4) The average velocity is zero

2007-01-26 17:49:46 · 4 answers · asked by Anonymous in Physics