Science & Mathematics - 24 November 2007

or how can I make an odorless petroluem distillates solvent?

2007-11-24 11:51:54 · 1 answers · asked by mhike 1 in Chemistry

2007-11-24 11:49:23 · 5 answers · asked by Cliffmom 1 in Mathematics

When the non vegetarian life is born, the eyes are closed. When the Vegetarians are born the eyes are always open. Take the example puppies, cubs etc. as compared to calf, horse and human beings.

2007-11-24 11:47:19 · 8 answers · asked by vipin G 2 in Biology

the general formula Cu[NH3}x]SO4.H20 in which the NH3 molecules are bound to the CU2+ ion and are acting as ligands, why is it necessary to use very conc.NH3 solution to prepare the complex?

and what would happen if i wash the crystals with water?

2007-11-24 11:44:09 · 1 answers · asked by Anonymous in Chemistry

2007-11-24 11:43:26 · 5 answers · asked by WweFan2007 1 in Mathematics

NH3 H20 F- NA+ AL3+ CH4

2007-11-24 11:40:42 · 2 answers · asked by Anonymous in Chemistry

2007-11-24 11:38:37 · 5 answers · asked by AirGear/GSD Fan 1 in Physics

If so did you go on the Ghost Tour?
Just wondering if anyone experienced anything out of the ordinary - reassurance it wasnt just me.
Do you think it was legit? Either way i had a great time.

2007-11-24 11:37:00 · 3 answers · asked by Anonymous in Paranormal Phenomena

What happens to the crust as mountains are worn down?

2007-11-24 11:36:44 · 3 answers · asked by Jeanette50 1 in Earth Sciences & Geology

(10 - 7x)^2 = 11

2007-11-24 11:34:29 · 17 answers · asked by Anonymous in Mathematics

If I am a multiple of 3, then I am between 50 and 59.

2007-11-24 11:33:46 · 6 answers · asked by cookie 1 in Mathematics

11x^2 = 49

I'm not sure the answer. I know it's something like 7/sqrt11 over 11 or something but I need help !! pls help!!

2007-11-24 11:33:38 · 6 answers · asked by Anonymous in Mathematics

2007-11-24 11:33:19 · 2 answers · asked by joe h 1 in Astronomy & Space

I did a lab on science class and the teachers gave us some questions to add to our lab report.
It says, write the chemical equation for soap production. (it may be unbalanced)

I reall have no idea what to do..

What we used was
*Castor oil
*Sodium Hydroxide (20%) - NaOH
*Sodium Chloride (salt) - NaCl

and we ended up with soap.

Please help i would gladly appreciate it.

2007-11-24 11:32:43 · 3 answers · asked by Anonymous in Chemistry

Weight comes from gravity force pulling down, But what about mass? Is it still mystery question that still hasn't been solved?

2007-11-24 11:29:06 · 6 answers · asked by Tobiko x) 1 in Physics

2007-11-24 11:28:11 · 4 answers · asked by Anonymous in Biology

2007-11-24 11:27:30 · 3 answers · asked by Alex E 1 in Mathematics

I dont understand how early hominids with stone tools could colonise the americas/australasia/pacific islands long before the white man met them. Humans originated in africa and there are so many land masses not connected to africa which have a 'native' human population. Surely they didn't sail the seven seas in wooden canoes?!

2007-11-24 11:26:45 · 17 answers · asked by Gabriel H 3 in Geography

Can someone give me some good examples of the difference between heat energy and temperature?

I know that heat energy is the total kinetic energy of all the atoms in a substance and that temperature is a measure of the average kinetic energy of all the atoms in a body, but I would like to have a few different examples of this to better understand it.

2007-11-24 11:25:35 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Our chemistry class is going over radiation, and I just have a few questions.

For Beta decay, does a neutron turn into a proton and electron, and then the electron given off as a Beta particle? And if so, how does this happen?
Also, how does a proton and electron turn into a neutron in Electron Capture?

And what is the decay constant?
Also, for the equation: Rate = k[A] where k=decay constant and [A] is the amount of material, what can be plugged in for the rate? If half-life is plugged into for the rate, does the equation work?

2007-11-24 11:23:17 · 2 answers · asked by silvershadow0001 1 in Chemistry

Explain as to why a constant wind causes the time of a round trip of an air plane to increase versus no wind? Give an example and calculate the round trip time with and without a constant wind. Do not discuss the physics of wind resistance. Rather discuss the mathematics of the round trip time and average speed of the plane with and without the wind.

A similar example is dollar cost averaging of buying stock. Dollar cost averaging of buying stock is to buy stock at periodic intervals by investing the same amount at each interval. For example, you invest $500 a month for 4 months for a total of $2000. If the stock price prices for the 4 months are $10/shr, $12/shr, $8/shr, and $10/shr, how many shares would you buy? How many shares would you buy if the average cost were $10/shr? How is this similar to the average speed of the round trip plane flight with a constant wind in a single direction?

2007-11-24 11:21:55 · 1 answers · asked by lvthebeach 2 in Mathematics

2007-11-24 11:20:09 · 5 answers · asked by sohan s 1 in Mathematics

What advantage does it give the child to have him or her get sick and build up antibodies themself?

Even after being breastfed. THANKS!

2007-11-24 11:18:31 · 3 answers · asked by Anonymous in Biology

2007-11-24 11:17:16 · 5 answers · asked by jamie 1 in Chemistry

2007-11-24 11:15:28 · 2 answers · asked by jamie 1 in Physics

a. 0.67N
b. 2.0N
c. 4.0N
d. 6.0N

2007-11-24 11:15:11 · 4 answers · asked by tessababy992006 1 in Chemistry

4Al +3O2 ---> 2Al2O3

if 5.0 moles of Al react with excess O2, how many moles of Al203 can be formed?

2007-11-24 11:12:51 · 3 answers · asked by Anonymous in Chemistry

Suppose the unit cell of a crystalline ionic compound consists of a cube with ions of element X at each corner and ions of element Y at the centre of each face. What is the empirical (simplest) formula of this compound?
a. XY4
b. X3Y
c. X3Y4
d. XY3
e. X4Y
f. X4Y3
g. X2Y3
I'm not really sure how to approach this problem... I know there's 8 atoms of X and 6 atoms of Y but does that determine my ratio?

2007-11-24 11:12:06 · 2 answers · asked by ¿ /\/ 馬 ? 7 in Chemistry

Subtract. Express answer in simplest form
(3x/x-2)-(6/x-2)

2007-11-24 11:11:00 · 7 answers · asked by meme 1 in Mathematics

please help me answer and show work!!
Cu + 4HNO3= Cu(NO3)2 +2NO2 +2H2O
You have 9.35 g Cu and .4 mol of HNO3

1. how many mol of Cu were initially dropped in the nitric acid?
2. One of these reactants were in excess, which and how did you know? (show the ratio)
3. What mass of Cu reacted?
4. What mass of Cu remained after the reaction was over
5. WHat volume of gas measured at STP escaped during the reaction?
6. what is the name of the blue crystalline substance left behind after the evaporation of the water?
7. WHat should be the mass of this blu crystalline substance? (formed after the reaction is completed, removing the unreacting copper and heating the remaining liquid to evaporate the water and form it)?

2007-11-24 11:09:06 · 2 answers · asked by papi 5 in Chemistry