Science & Mathematics - 20 November 2007

1 - 80g of lead is coated with 30g of mercury. if the densities of lead & mercury are 11.37g/cm^3 and 13.6g/cm^3, calculate the density of the amalgam.

2 - A student mistakenly added 50cm^3 of methylated spirit to 100cm^3 of water. calculate the density of the mixture given density of methylated spirit and that of water to be 0.76g/cm^3 and 1.0g/cm^3

may god bless all who helps me in these questions.....AMEN!

2007-11-20 09:04:26 · 1 answers · asked by Anonymous in Physics

and what would happen if it did become discarded?

2007-11-20 08:56:15 · 1 answers · asked by Anonymous in Physics

2H2O(l) --> 2H2O(l) + O2(g)

a) how will you determine the mass and number of moles of oxygen produced?

b) how will you determine the volume of oxygen produced?

need help guys!

2007-11-20 08:53:39 · 1 answers · asked by jenny 2 in Chemistry

the reaction is C2H6----- C2H4 + H2

2007-11-20 08:50:15 · 2 answers · asked by Anonymous in Chemistry

What I'm curious about,is the scenerio of what would happen if we had a "near miss?"...a comet or asteriod skimming our gravitational field....would we spin out of control or just experience wild tidal patterns etc etc???

2007-11-20 08:48:30 · 11 answers · asked by omegaman 2 in Astronomy & Space

H2SO4

NaSO3

2007-11-20 08:47:37 · 3 answers · asked by Wayne e 1 in Chemistry

I live in Northern VA, and I don't know where Perseus is. Where would I look? A picture would help greatly.

2007-11-20 08:46:48 · 3 answers · asked by Anonymous in Astronomy & Space

Many years ago in the far off land of Chanzania, a prisoner was to be executed. The king of Chanzania was a sporting fellow who thought highly of good thinkers. The king offered the prisoner a chance for freedom. He was given 100 black balls and 100 white balls, and was told to distribute them any way he liked. He was then blindfolded and told to draw a ball at random from one of the urns. If he drew a black ball he would be executed. If he drew a white ball, he would have his freedom. ( The urns were rearranged.) The prisoner was smart so he was set free. How would you have distributed the ba;;s in the three urns?


I know how to do it. I just need the answer with the highest pro bability!

2007-11-20 08:45:48 · 5 answers · asked by Anonymous in Mathematics

I have a research paper due tomorow, wednesday. with the topic above, what would my research paper be on?

2007-11-20 08:44:20 · 4 answers · asked by Someone 1 in Other - Alternative

and how are they formed

2007-11-20 08:44:03 · 4 answers · asked by Cheers2U 2 in Weather

what is the weight of a cord of oakwood? (cord = 128 cubic feet)

2007-11-20 08:42:29 · 1 answers · asked by Anonymous in Mathematics

the equations are

aluminum chloride plus silver nitrate yields silver chloride and aluminum nitrate.


beryllium hydroxide plus hydrogen nitrate yields beryllium nitrate and water.

If you can figure out how, put the word equations in symbolic form when you post your answer

PLEASE help me slove these!!!

2007-11-20 08:41:48 · 2 answers · asked by Anonymous in Chemistry

2007-11-20 08:39:26 · 3 answers · asked by germanmonkey1 1 in Botany

answer this quick plz i need this for tomorrow

2007-11-20 08:38:32 · 6 answers · asked by Anonymous in Mathematics

In ancient times, four mathematicians discovered this game of logic. The four men were Hermos, Xentos, Appino and Tenedos. Hermos seated the other three men one behind the other, so that Xentos saw Appino and Tenedos, and Appino saw only Tenedos. Tenedos, who was in the front, saw neither Appino or Xentos.
Hermos had five hats which he showed to the three men. Three of the hats were grey, and two were white. Then Hermos put a hat in each man and tossed the remaining two aside.
“what color is your hat Xentos?” asked Hermos. Xentos did not know. Appino did not know the color of his hat either when asked. Tenedos, who could not see any hats at all , gave the right answer when he was asked the color of his hat, what was the color of his hat? How did he figure it out?

PLEASE HELP ME!

2007-11-20 08:38:28 · 3 answers · asked by Anonymous in Mathematics

Aperture: 50mm
• Focal length: 350mm
• Eyepieces: H6, H20(31.75mm)
• Supplied accessories: Metal table tripod

What can i see in the space with this telescope??Thankss

2007-11-20 08:38:06 · 4 answers · asked by Anonymous in Astronomy & Space

a player kicks a football from the ground level with a velocity of magnitude 27.0 m/s at an angle of 30.0 degrees above the horizontal.

2007-11-20 08:37:40 · 1 answers · asked by lilpinai1788 1 in Physics

solve:
(x^2 y ^3 z)^3 (x^3 yz^2)
where x= 0.5, y=2 and z=3

2007-11-20 08:36:22 · 5 answers · asked by AFSHAN L 1 in Mathematics

2007-11-20 08:34:55 · 3 answers · asked by RoRoStar 1 in Physics

Please, I am terrified of doing these, please could someone explain it to me? Thank you, so much.

*To the best answer

2007-11-20 08:33:13 · 26 answers · asked by Sarah I 2 in Mathematics

i jsut got prescribed ritalin la for a.d.d. at about 20 mg and i feel like the onset only last about 2 to 3 hours which is not enough to get me through the day..it also makes me extremely hungry by the time it wears off..does anyone else have any experiences with the drug for advice and insight

2007-11-20 08:22:09 · 4 answers · asked by alena c 2 in Medicine

mixed 10.0 moles of Ca, which is the limiting reagent?

V2O5 + 5Ca >>>> 2V + 5CaO

Could you please show the steps in your results. (TIA)

2007-11-20 08:21:57 · 2 answers · asked by xxxladyxxx 1 in Chemistry

what is the integral of (sec^2)3x?

i'd appreciate any help. thanks,

2007-11-20 08:21:45 · 4 answers · asked by yefimthegreat 1 in Mathematics

2007-11-20 08:21:18 · 6 answers · asked by emrajbari 1 in Mathematics

just asking.

2007-11-20 08:20:52 · 7 answers · asked by Dragonflygirl 7 in Medicine

ln(sec θ) = -ln (cos θ)

2007-11-20 08:19:50 · 2 answers · asked by Anonymous in Mathematics

What is the reducing agent and oxidizing ...thanks a bunch:)

2007-11-20 08:15:46 · 1 answers · asked by Anonymous in Chemistry

An antacid tablet requires 25.82 ml of 0.200 M HCl to titrate to its endpoint. What volume in ml of stomach acid can be neutralized by the antacid tablet? Assume the stomach acid as a pH of 1.10.

2007-11-20 08:13:03 · 1 answers · asked by Anonymous in Chemistry

2007-11-20 08:12:00 · 3 answers · asked by parasu r 1 in Engineering

I study glass and i want to know properties of fluorescent glass...

2007-11-20 08:11:49 · 3 answers · asked by Sofia C 2 in Physics