Science & Mathematics - 16 November 2007

(a) pure water

(b) 0.22 M KBr solution

(c) 0.12 M Pb(NO3)2 solution

2007-11-16 11:46:45 · 1 answers · asked by Andrew B 2 in Mathematics

a ridgid 8.2L flask contains a mixture of 2.5 moles of h2 , .5 mol of O2 and sufficent Ar so that the partial pressure of Ar in the flask is 2.00 atm. the temp is 127 C.

a. calculate the total pressure in the flask
b. calculate mole fraction of H2 in the flask
c. calculate density ( in g L-1) of the mixture in the flask

the mixture in the gas is ignited by a spark, and the reaction represented below occurs untill ne of the reactants is completly comsumed.

2H2 (g) +O2 (g) ----> 2H2O(g)

d. give the mole fraction of all species present in the flask at the end of the reaction.

2007-11-16 11:46:23 · 3 answers · asked by Help?? 2 in Chemistry

2007-11-16 11:44:43 · 2 answers · asked by Anonymous in Physics

Why do many people work for a low salary as an Elecetronic Technician when they have a BS in Electronic Engineering and can be engineers instead?

2007-11-16 11:44:25 · 7 answers · asked by Anonymous in Engineering

A telstar

2007-11-16 11:41:45 · 2 answers · asked by desertrecon89101 1 in Astronomy & Space

Hey can people help me construct sentences for physics vocab! I'm sorry for asking you about this but it really is hard when whatever you do to understand it doesn't help! please help! here are the words:
Mechanical wave
transverse wave
longitudinal wave
rarefaction
surface wave
amplitude
hertz
angle of incidence
angle of reflection
refraction
diffraction
interference
constructive interference
destructive interference
standing wave
node antinode
resonance
seismic wave
primary wave
secondary wave

2007-11-16 11:34:55 · 3 answers · asked by npat 1 in Physics

2007-11-16 11:29:57 · 9 answers · asked by Duffyisagoodboy 2 in Astronomy & Space

2007-11-16 11:28:32 · 1 answers · asked by Macgyver with Crosby 4 in Earth Sciences & Geology

Could they be the evaporated remnant of the Global flooding described in the story of Gilgamesh and the Bible?

2007-11-16 11:26:05 · 10 answers · asked by Anonymous in Earth Sciences & Geology

8x^3-6x^2+2x/4x+1

2007-11-16 11:26:00 · 5 answers · asked by Anonymous in Mathematics

I heard the sun is like constantly growing cos reaction to give out heat means looses gravitational pull.. and so eventaully (in a few million/billion years) will die out and may even consume earth.. is this true?? if yes and u know a link pleas include it

2007-11-16 11:24:46 · 16 answers · asked by Anonymous in Astronomy & Space

multiply.

(x/3+3/4)(3x/4-3/5)

2007-11-16 11:22:35 · 7 answers · asked by Anonymous in Mathematics

2007-11-16 11:19:55 · 7 answers · asked by Anonymous in Engineering

2007-11-16 11:19:42 · 1 answers · asked by Moppy 1 in Astronomy & Space

My reasoning is that physical changes would be caused by changes in the genes and changes in genes would be retained and passed down the generations.

2007-11-16 11:18:08 · 9 answers · asked by purplepeace59 5 in Biology

2007-11-16 11:15:50 · 3 answers · asked by Anonymous in Mathematics

2007-11-16 11:14:42 · 2 answers · asked by Anonymous in Mathematics

I want to make a model of a maglev train and I want to know as many of the maglev propulsion systems as possible. In detail, but explained simply.

2007-11-16 11:12:49 · 4 answers · asked by Anonymous in Engineering

2007-11-16 11:11:56 · 19 answers · asked by gapeach062006 1 in Astronomy & Space

On the radio this morning they said 50% of Americans got this wrong. That's Hard to belive.

2007-11-16 11:11:14 · 13 answers · asked by Ken R 3 in Astronomy & Space

2007-11-16 11:11:00 · 14 answers · asked by Anonymous in Other - Science

6Mg + P4 ---> 2Mg3P2

I have 2.5 moles of Mg. How many moles of P4 do I need in this reaction to completely use up all of this Mg?




4Cu(s) + O2(g) ---> 2Cu2O(s)

How many grams of Cu2O will be produced if I react 4.8 grams of copper metal with excess oxygen gas?

2007-11-16 11:10:05 · 1 answers · asked by <3 1 in Chemistry

I know you can add aspirin to diionized water to make it ionized. I'd like to find out what I can add to diesel to make it ionized.

Suggestions?

thanks
john

2007-11-16 11:08:49 · 3 answers · asked by John B 1 in Chemistry

2007-11-16 11:06:30 · 8 answers · asked by BroBubba 2 in Astronomy & Space

For a test question, a mathematics teacher wants to find two constants a and b such that the test item "Simplify a(-9x + 2y) - b(7x - 4y) " will have an answer of (46x - 20y). What constants should the teacher use for a and b?

I have no idea where to start.

2007-11-16 11:04:42 · 5 answers · asked by thebodyelectric! 1 in Mathematics

could i use it without damaging the battery. Thanks to others on this site i have worked out that it should run for 65 minutes, but i have been told that lead acid batteries should not be completely discharged or they will fail quickly. With this in mind, how many minutes could i run this battery/ lamp combination before i am getting close to damaging the battery? I want to be able to use it and recharge it once a week for 2 years or so. Thanks for your help.

2007-11-16 11:04:25 · 7 answers · asked by Anonymous in Physics

this problem is pretty hard !!

2007-11-16 11:03:01 · 3 answers · asked by Anonymous in Mathematics

show work.

2007-11-16 10:58:44 · 8 answers · asked by metsrule3029 1 in Mathematics

I am in Suffolk England and the time is 23.48. Outside the sky is crystal clear and cold as hell. If I look straight up I can see a fuzzy blob with the naked eye which is very clear with binoculars.

2007-11-16 10:57:11 · 9 answers · asked by Anonymous in Astronomy & Space

SHOW WORK.

2007-11-16 10:56:18 · 30 answers · asked by metsrule3029 1 in Mathematics